Setmelanotide 10 Mg/ml (as Setmelanotide Acetate) Injectable Solution

1.1 Limitations of Use:

IMCIVREE is not indicated for the treatment of patients with the following conditions as IMCIVREE would not be expected to be effective:
• Obesity due to suspected POMC, PCSK1, or LEPR deficiency with POMC, PCSK1, or LEPR variants classified as benign or likely benign.
• Other types of obesity not related to acquired HO, BBS, or POMC, PCSK1, or LEPR deficiency, including obesity associated with other genetic syndromes and general (polygenic) obesity

2.1 Patient Selection

Acquired HO

Select patients for treatment with IMCIVREE who have acquired HO [see Clinical Studies (14.1)].

BBS

Select patients for treatment with IMCIVREE who have a clinical diagnosis of BBS [see Clinical Studies (14.2, 14.4)].Consider genetic confirmation in pediatric patients aged <6 years.

POMC, PCSK1, or LEPR Deficiency

Select patients for treatment with IMCIVREE who have genetically determined or suspected deficiency of POMC, PCSK1, or LEPR [see Clinical Studies (14.3, 14.4)]. Treat patients with variants in POMC, PCSK1, or LEPR genes that are interpreted as pathogenic, likely pathogenic, or of uncertain significance (VUS) in the clinical context of the patient [see Clinical Studies (14.3, 14.4)]. An FDA-approved test for the detection of variants in the POMC, PCSK1, or LEPR genes is not available.

2.2 Recommended Dosage in Patients with Acquired HO

Monitor patients for gastrointestinal (GI) adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the starting dosage is: Not tolerated, discontinue the product. Tolerated for 2 weeks, increase the dosage as presented in Table 1 or Table 2. Adults and Pediatric Patients Aged 6 Years and Older

The recommended starting dosage is 0.5 mg (0.05 mL) injected subcutaneously once daily for 2 weeks.

Pediatric Patients Aged 4 to Less Than 6 Years

The recommended starting dosage is 0.5 mg (0.05 mL) injected subcutaneously once daily for 2 weeks.

2.3 Recommended Dosage in Patients with BBS or POMC, PCSK1, or LEPR Deficiency

Adults and Pediatric Patients Aged 12 Years and Older

The recommended starting dosage is 2 mg (0.2 mL) injected subcutaneously once daily for 2 weeks in adults and pediatric patients aged 12 years and older. Monitor patients for GI adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the starting dosage is: Not tolerated, reduce the dosage to 1 mg (0.1 mL) once daily. If the 1 mg once daily dosage is tolerated for at least 1 week, increase the dosage to 2 mg (0.2 mL) once daily. Tolerated for 2 weeks, increase the dosage to 3 mg (0.3 mL) once daily. If the 3 mg once daily dosage is not tolerated, decrease the dosage to 2 mg (0.2 mL) once daily. The recommended maintenance dosage is 3 mg (0.3 mL) injected subcutaneously once daily. Pediatric Patients Aged 6 to Less Than 12 Years

The recommended starting dosage is 1 mg (0.1 mL) injected subcutaneously once daily for 2 weeks in pediatric patients aged 6 to less than 12 years. Monitor patients for GI adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the starting dosage is: Not tolerated, reduce the dosage to 0.5 mg (0.05 mL) once daily. If the 0.5 mg once daily dosage is tolerated for at least 1 week, increase the dosage to 1 mg (0.1 mL) once daily. Tolerated for 2 weeks, increase the dosage to 2 mg (0.2 mL) once daily. If the 2 mg daily dosage is: Not tolerated, reduce the dosage to 1 mg (0.1 mL) once daily. Tolerated, increase the dosage to 3 mg (0.3 mL) once daily. The recommended maintenance dosage is 3 mg (0.3 mL) injected subcutaneously once daily. Pediatric Patients Aged 2 to Less Than 6 Years

The recommended starting dosage is 0.5 mg (0.05 mL) injected subcutaneously once daily for 2 weeks in pediatric patients aged 2 to less than 6 years. Monitor patients for GI adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the starting dosage is: Not tolerated, discontinue the product. Tolerated for 2 weeks, increase the dosage based on baseline body weight, as presented in Table 3.

2.4 Recommended Dosage in Patients with Renal Impairment

Recommended Dosage in Patients with End Stage Renal Disease [estimated glomerular filtration (eGFR) less than 15 mL/min/1.73 m ²]

IMCIVREE is not recommended for use in patients with end stage renal disease.

Recommended Dosage in Patients with Severe Renal Impairment (eGFR of 15 to 29 mL/min/1.73 m ²)

Adults and Pediatric Patients Aged 4 Years and Older with Acquired HO

IMCIVREE is not recommended for use in adults and pediatric patients aged 4 years and older with acquired HO and severe renal impairment.

Adults and Pediatric Patients Aged 12 Years and Older with BBS or POMC, PCSK1, or LEPR Deficiency

The recommended starting dosage is 0.5 mg (0.05 mL) injected subcutaneously once daily for 2 weeks in adults and pediatric patients aged 12 years and older with severe renal impairment. Monitor patients for GI adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the recommended starting dosage is [see Use in Specific Populations (8.6)]: Not tolerated, discontinue IMCIVREE. Tolerated for 2 weeks, increase the dosage to 1 mg (0.1 mL) once daily. If the 1 mg daily dosage is tolerated for at least 1 week, increase the dosage to 1.5 mg (0.15 mL) once daily. The recommended maintenance dosage is 1.5 mg (0.15 mL) injected subcutaneously once daily [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)]. Pediatric Patients Ages 6 Years to Less Than 12 Years with BBS or POMC, PCSK1, or LEPR Deficiency

The recommended starting dosage is 0.5 mg (0.05 mL) injected subcutaneously once daily for 2 weeks in pediatric patients aged 6 to less than 12 years with severe renal impairment. Monitor patients for GI adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the recommended starting dosage is [see Use in Specific Populations (8.6)]: Not tolerated, discontinue IMCIVREE. Tolerated for 2 weeks, increase the dosage to 1 mg (0.1 mL) injected subcutaneously once daily. The recommended maintenance dosage is 1 mg (0.1 mL) injected subcutaneously once daily [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)]. Pediatric Patients Aged 2 to Less Than 6 Years Weighing at Least 20 kg with BBS or POMC, PCSK1, or LEPR Deficiency

The recommended starting dosage is 0.5 mg (0.05 mL) injected subcutaneously once daily for 2 weeks in pediatric patients aged 2 to less than 6 years with severe renal impairment and weight of at least 20 kg. The use of IMCIVREE in pediatric patients aged 2 to less than 6 years with weight less than 20 kg and severe renal impairment is not recommended [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)]. Monitor patients for GI adverse reactions during dosage initiation and titration [see Adverse Reactions (6.1)]. If the recommended starting dosage is [see Use in Specific Populations (8.6)]: Not tolerated, discontinue IMCIVREE. Tolerated for 2 weeks, increase the dosage based on baseline body weight, as presented in Table 4 [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)].

The recommended maintenance dosage is 1 mg (0.1 mL) injected subcutaneously once daily [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)]. Monitor patients for adverse reactions [see Adverse Reactions (6.1)]. Recommended Dosage in Patients with Mild (eGFR of 60 to 89 mL/min/1.73 m ²) or Moderate (eGFR of 30 to 59 mL/min/1.73 m ²) Renal Impairment

The recommended dosage in patients with acquired HO, BBS, or POMC, PCSK1, or LEPR Deficiency and mild or moderate renal impairment is the same as in those with normal kidney function [see Dosage and Administration (2.2, 2.3)].

2.5 Administration Instructions

Prior to initiation of IMCIVREE, train patients and their caregivers on proper injection technique. Instruct them to use a 1-mL syringe with a 28-gauge or 29-gauge needle appropriate for subcutaneous injection. Remove IMCIVREE from the refrigerator approximately 15 minutes prior to administration. Alternatively, warm IMCIVREE prior to administration by rolling the vial gently between the palms of the hands for 60 seconds. Inspect IMCIVREE visually before use. It should appear clear to slightly opalescent, colorless to slightly yellow. Do not use if particulate matter or discoloration is seen. Administer IMCIVREE once daily, at the beginning of the day, without regard to meals. Inject IMCIVREE subcutaneously in the abdomen, thigh, or arm, rotating to a different site each day. Do not administer IMCIVREE intravenously or intramuscularly. If a dose is missed, resume the once daily regimen as prescribed with the next scheduled dose.

5.1 Disturbance in Sexual Arousal

Sexual adverse reactions may occur in patients treated with IMCIVREE. Spontaneous penile erections and increased frequency of penile erections in males occurred in clinical trials with IMCIVREE [see Adverse Reactions (6.1)].

Inform patients that these events may occur and instruct patients who have an erection lasting longer than 4 hours to seek emergency medical attention.

5.2 Depression and Suicidal Ideation

Some drugs that target the central nervous system, such as IMCIVREE, may cause depression or suicidal ideation [see Adverse Reactions (6.1)]. Patients with a history of depression or suicidal ideation may be at increased risk for recurrent episodes while taking IMCIVREE.
Monitor patients for new onset or worsening of depression, suicidal thoughts or behavior, or any unusual changes in mood or behavior. Consider discontinuing IMCIVREE if patients experience suicidal thoughts or behaviors or if clinically significant or persistent depression symptoms occur.

5.3 Hypersensitivity Reactions

Serious hypersensitivity reactions, including anaphylaxis, have been reported with IMCIVREE. These reactions generally occurred within minutes to hours after injecting IMCIVREE [see Adverse Reactions ( 6.2)]. If hypersensitivity reactions occur, advise patients to promptly seek medical attention and discontinue use of IMCIVREE. IMCIVREE is contraindicated in patients with a prior serious hypersensitivity reaction to setmelanotide or any of the excipients in IMCIVREE.

5.4 Skin Hyperpigmentation, Darkening of Pre-Existing Nevi, and Development of New Melanocytic Nevi

Generalized or focal increases in skin pigmentation occurred in the majority of IMCIVREE-treated patients in clinical trials [ see Adverse Reactions (6.1) and Clinical Pharmacology (12.1)]. This effect is reversible upon discontinuation of the drug.

IMCIVREE may also cause the development of new melanocytic nevi or darkening of pre-existing nevi due to its pharmacologic effect.
Perform a full body skin examination prior to initiation and periodically during treatment with IMCIVREE to monitor pre-existing and new skin pigmented lesions.

5.5 Acute Adrenal Insufficiency in Patients with Acquired HO

In a clinical trial of adults and pediatric patients aged 4 years and older with acquired HO and secondary adrenal insufficiency, serious adverse reactions related to acute adrenal insufficiency were reported by 5% of IMCIVREE-treated patients and no placebo-treated patients. In patients with secondary adrenal insufficiency, monitor for clinical signs of acute adrenal insufficiency.

5.6 Sodium Imbalance in Patients with Acquired HO and Central Diabetes Insipidus

In a clinical trial of adults and pediatric patients aged 4 years and older with acquired HO and concomitant central diabetes insipidus (DI)/arginine vasopressin (AVP) deficiency, hyponatremia was reported in 6% of IMCIVREE-treated patients and 2% of placebo-treated patients, and hypernatremia was reported in 5% of IMCIVREE-treated patients and 4% of placebo-treated patients.

In patients with acquired HO and concomitant DI/AVP deficiency, monitor serum sodium levels with changes in fluid intake and hydration status. Adjust the doses of concomitant therapies for DI/AVP deficiency as needed.

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Acquired HO (Adults and Pediatric Patients Aged 4 Years and Older)

The safety of IMCIVREE was evaluated in a randomized, double-blind, placebo-controlled clinical trial which included a dose titration period of 4 to 8 weeks and a 52-week treatment period, in 142 patients aged 4 years and older with acquired HO (Trial 1) [see Clinical Studies (14.1)]. The trial duration was 56 to 60 weeks.

Table 5 summarizes the adverse reactions that occurred in 5% or more of the IMCIVREE-treated patients and more frequently than placebo-treated patients in Trial 1.

Other Adverse Reactions in Patients Aged 4 Years and Older with Acquired HO

Disturbance in Sexual Arousal

Spontaneous penile erections and increased frequency of penile erections were reported in 7% of IMCIVREE-treated patients and 4% of placebo-treated patients.

Acute Adrenal Insufficiency

Serious adverse reactions related to acute adrenal insufficiency were reported by 5% of IMCIVREE-treated patients and no placebo-treated patients.

Sodium Imbalance

Among patients with acquired HO and concomitant central diabetes insipidus (DI)/arginine vasopressin (AVP) deficiency, hyponatremia was reported in 6% of IMCIVREE-treated patients and 2% of placebo-treated patients, and hypernatremia was reported in 5% of IMCIVREE-treated patients and 4% of placebo-treated patients.

Bardet-Biedl Syndrome (Adults and Pediatric Patients Aged 6 Years and Older)

The safety of IMCIVREE was evaluated in a clinical trial, which included a 14‑week, randomized, double-blind, placebo-controlled period followed by a 52-week open-label treatment period, in 44 patients aged 6 years and older with obesity and a clinical diagnosis of BBS (Trial 2) [see Clinical Studies (14.2)]. The trial duration was 66 weeks.

During the 14-week placebo-controlled period in Trial 2, the most common reported adverse reactions in IMCIVREE-treated patients when compared to placebo-treated patients were hyperpigmentation disorders (67% vs 0%, respectively) and vomiting (11% vs 0%, respectively).

Adverse reactions were also evaluated during the 52-week active-treatment period, defined as the period from randomization to Week 52 in patients initially randomized to IMCIVREE, and from Week 14 to Week 66 in patients initially randomized to placebo. Table 6 summarizes the adverse reactions that occurred in 2 or more IMCIVREE-treated patients in Trial 2 during the 52-week active treatment period.

POMC, PCSK1, and LEPR Deficiency (Adults and Pediatric Patients Aged 6 Years and Older)

The safety of IMCIVREE was evaluated in two 52-week, open-label clinical trials of 27 patients aged 6 years and older with obesity due to POMC, PCSK1, or LEPR deficiency with POMC, PCSK1, or LEPRgenes that are interpreted as pathogenic, likely pathogenic, or of uncertain significance (Trial 3 and Trial 4) [see Clinical Studies (14.3)].

Table 7 summarizes the adverse reactions that occurred in the open-label trials during the first 52 weeks of treatment in 3 or more patients treated with IMCIVREE.

POMC, PCSK1, and LEPR Deficiency and BBS (Pediatric Patients Aged 2 to less than 6 Years)

The safety of IMCIVREE was evaluated in one 52-week, open-label clinical trial of 12 patients aged 2 to less than 6 years with obesity due to POMC, PCSK1, or LEPR deficiency with POMC, PCSK1, or LEPRgenes that are interpreted as pathogenic, likely pathogenic, or of uncertain significance, or obesity due to BBS (Trial 5) [see Clinical Studies (14.4)]. No patients with PCSK1 were enrolled in the trial.

Table 8 summarizes the adverse reactions that occurred in the open-label trial during 52 weeks of treatment in 3 or more patients treated with IMCIVREE.

Other Adverse Reactions in Patients Aged 2 to less than 6 Years with Obesity due to POMC or LEPR Deficiency or BBS

Disturbance in Sexual Arousal

Spontaneous penile erections were reported in 8% of IMCIVREE-treated patients.

Depression

Depressed mood was reported in 8% of IMCIVREE-treated patients

6.2 Postmarketing Experience

The following adverse reactions have been identified during post-approval use of IMCIVREE. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Hypersensitivity, including anaphylaxis

8.1 Pregnancy

Risk Summary

Discontinue IMCIVREE when pregnancy is recognized unless the benefits of therapy outweigh the potential risks to the fetus.

IMCIVREE contains the preservative benzyl alcohol. Because benzyl alcohol is rapidly metabolized by a pregnant woman, benzyl alcohol exposure in the fetus is unlikely.

There are no available data with IMCIVREE in pregnant women to inform a drug-associated risk for major birth defects and miscarriage, or adverse maternal or fetal outcomes. For the general US population, weight loss offers no potential benefit to a pregnant woman and may result in fetal harm (see Clinical Considerations).In animal reproduction studies, setmelanotide subcutaneously administered to pregnant rats from before mating to the end of organogenesis was not teratogenic at doses 11 times the maximum recommended human dose (MRHD) of 3 mg. Setmelanotide subcutaneously administered to pregnant rabbits during the period of organogenesis was not teratogenic at clinical doses. Setmelanotide administered subcutaneously to pregnant rats during organogenesis through lactation did not result in adverse developmental effects at doses 7 times the MRHD ( see Data).

The estimated background risk of birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.

Clinical Considerations

Disease-Associated Maternal and/or Embryo/Fetal Risk

Maternal obesity increases the risk for congenital malformations, including neural tube defects, cardiac malformations, oral clefts, and limb reduction defects. In addition, weight loss during pregnancy may result in fetal harm including increased risk of small for gestational age. Appropriate weight gain based on pre-pregnancy weight is currently recommended for all pregnant women, including those who are already overweight or have obesity, due to the obligatory weight gain that occurs in maternal tissues during pregnancy.

Data

Animal Data

Embryo-fetal development was evaluated in female rats administered setmelanotide subcutaneously during mating to end of major organogenesis (14 days prior to mating to gestation day 17) at doses of 0.5, 3, and 5 mg/kg/day, resulting in exposures up to 11 times the human exposure at MRHD of 3 mg, based on AUC. Dose-related decreases in maternal food intake and body weight gain were observed during the premating period but not during gestation. No evidence of embryo-fetal toxicity was observed.

Embryo-fetal development was evaluated in pregnant rabbits subcutaneously administered setmelanotide during organogenesis (gestation days 7 to 19) at doses of 0.05, 0.1, and 0.2 mg/kg/day, resulting in clinically relevant exposures at the MRHD, based on AUC. Decreases in maternal food consumption and body weight were observed at all doses. Increases in embryo-fetal resorptions and post-implantation losses were observed at ≥0.1 mg/kg/day in the presence of significant maternal toxicity, and fetal body weights were 7% lower than controls at 0.2 mg/kg/day.

Pre- and post-natal development was evaluated in rats subcutaneously administered setmelanotide during organogenesis and continuing until weaning (gestation day 6 to lactation day 21) at doses of 0.5, 3.0, and 5.0 mg/kg/day, which resulted in exposures up to 7 times the human exposure at the MRHD, based on AUC. Pup body weights at birth were 9% lower than controls at 3.0 and 5.0 mg/kg/day, which was consistent with reduced maternal body weight gain and food consumption during gestation. No adverse setmelanotide-related effects on pup survival, growth, maturation, visual function, neurobehavioral performance, or reproductive performance were observed up to the highest dose.

8.2 Lactation

Risk Summary

Treatment with IMCIVREE is not recommended for use while breastfeeding.

IMCIVREE from multiple-dose vials contains the preservative benzyl alcohol. Because benzyl alcohol is rapidly metabolized by a lactating woman, benzyl alcohol exposure in the breastfed infant is unlikely.

There is no information on the presence of setmelanotide or its metabolites in human milk, the effects on the breastfed infant, or the effects on milk production. However, setmelanotide is present in the milk of rats ( see Data). When a drug is present in rat milk, it is likely that the drug will be present in human milk.

Data

Dose-related setmelanotide concentrations were observed in milk 2 hours after subcutaneous injection in the preweaning phase of a pre- and post-natal development study in rats. No quantifiable setmelanotide concentrations were detected in plasma from nursing pups on postnatal Day 11.

8.4 Pediatric Use

Acquired HO

The safety and effectiveness of IMCIVREE have been established to reduce excess body weight and maintain weight reduction long term in pediatric patients aged 4 years and older with acquired HO. Use of IMCIVREE for this indication is supported by evidence from a 56- to 60‑week randomized, double-blind, placebo-controlled trial that included 76 pediatric patients with acquired HO aged 4 to 17 years [see Clinical Studies (14.1)].

Adverse reactions with IMCIVREE treatment in pediatric patients aged 4 to 17 years with acquired HO were generally similar to those reported in adults [ see Adverse Reactions (6.1)]. Perform a full body skin examination prior to initiation and periodically during treatment with IMCIVREE to monitor pre-existing and new skin pigmented lesions [ see Warnings and Precautions (5.4)].

The safety and effectiveness of IMCIVREE have not been established in pediatric patients younger than 4 years of age with acquired HO.

BBS or POMC, PCSK1, or LEPR Deficiency

The safety and effectiveness of IMCIVREE have been established to reduce excess body weight and maintain weight reduction long term in pediatric patients aged 2 years and older with obesity due to:

BBS [see Clinical Studies (14.2, 14.4)] POMC, PCSK1, or LEPR deficiency with variants in POMC, PCSK1, or LEPRgenes that are interpreted as pathogenic, likely pathogenic, or of uncertain significance (VUS) [see Clinical Studies (14.3, 14.4)] Use of IMCIVREE for these indications is supported by evidence from one 66-week trial, which included a 14-week, randomized, double-blind, placebo-controlled period followed by a 52-week open-label period, and included 22 pediatric patients with BBS aged 6 to 17 years (Trial 2); from two 1-year, open-label trials that included 9 pediatric patients with POMC, PCSK1, or LEPR deficiency aged 6 to 17 years (Trial 3 and Trial 4); and one 1-year, open-label trial that included 12 pediatric patients with POMC or LEPR deficiency or BBS aged 2 to less than 6 years (Trial 5) [see Clinical Studies (14.2, 14.3, 14.4)].

Adverse reactions with IMCIVREE treatment in pediatric patients aged 2 to less than 6 years with BBS, POMC, PCSK1, or LEPR deficiency were generally similar to those reported in adults and in pediatric patients aged 6 years and older. Pediatric patients with BBS, POMC, PCSK1, or LEPR deficiency treated with IMCIVREE had greater incidences of vomiting, skin hyperpigmentation, and new or darkening nevi compared to adults with BBS, POMC, PCSK1, or LEPR deficiency treated with IMCIVREE [see Adverse Reactions (6.1)]. Perform a full body skin examination prior to initiation and periodically during treatment with IMCIVREE to monitor pre-existing and new skin pigmented lesions [see Warnings and Precautions (5.4)].

The safety and effectiveness of IMCIVREE have not been established in pediatric patients younger than 2 years of age with BBS, POMC, PCSK1, or LEPR deficiency.

8.5 Geriatric Use

Clinical trials of IMCIVREE did not include patients aged 65 and over. It is not known whether geriatric patients would respond differently than younger adult patients.

8.6 Renal Impairment

Patients with severe renal impairment have a higher exposure of setmelanotide relative to patients with normal kidney function. IMCIVREE is not recommended for use in adults and pediatric patients aged 4 years and older with acquired HO and severe renal impairment.

For patients with BBS or POMC, PCSK1, or LEPR deficiency, reduce the recommended starting and maintenance dosage of IMCIVREE in adults and pediatric patients 2 years of age and older with severe renal impairment (eGFR 15 29 mL/min/1.73 m ²). The use of IMCIVREE in pediatric patients aged 2 to less than 6 years with weight less than 20 kg and severe renal impairment is not recommended [ see Dosage and Administration (2.4), Clinical Pharmacology (12.3)].

The recommended dosage in patients with mild (eGFR of 60 89 mL/min/1.73 m ²) or moderate renal impairment (eGFR of 30-59 mL/min/1.73 m ²) is the same as those with normal kidney function [ see Clinical Pharmacology (12.3)].
IMCIVREE is not recommended for use in patients with end stage renal disease (eGFR less than 15 mL/min/1.73 m ²).

12.1 Mechanism of Action

Setmelanotide is an MC4 receptor agonist with 20-fold less activity at the melanocortin 3 (MC3) and melanocortin 1 (MC1) receptors. MC4 receptors in the brain are involved in regulation of hunger, satiety, and energy expenditure. Based on nonclinical evidence, setmelanotide may re establish MC4 receptor pathway activity to reduce food intake and promote weight loss through decreased caloric intake and increased energy expenditure in patients with obesity due to acquired HO, BBS, or POMC, PCSK1, or LEPR deficiency associated with insufficient activation of the MC4 receptor. The MC1 receptor is expressed on melanocytes, and activation of this receptor leads to accumulation of melanin and increased skin pigmentation independently of ultraviolet light [see Warnings and Precautions (5.4) and Adverse Reactions (6.1)].

12.2 Pharmacodynamics

At a dose 2.3 times the maximum recommended dose, IMCIVREE does not prolong the QT interval to any clinically relevant extent.

Energy Expenditure

Short-term administration of IMCIVREE in 12 otherwise healthy patients with obesity increased resting energy expenditure and shifted substrate oxidation to fat. The safety and effectiveness of IMCIVREE have not been established in such patients and IMCIVREE is not approved to treat such patients [see Indications and Usage (1)].

12.3 Pharmacokinetics

The mean steady state setmelanotide Cmax,ss, AUCtau, and trough concentration for a 3-mg dose administered subcutaneously once daily was 31 ng/mL, 373 h*ng/mL, and 5 ng/mL, respectively simulated using individual PK model parameters from 109 adult patients with normal renal function. Steady-state plasma concentrations of setmelanotide were achieved within 2 days with daily dosing of 1-3 mg setmelanotide. The accumulation of setmelanotide in the systemic circulation during once-daily dosing over 12 weeks was approximately 30%. Setmelanotide AUC and Cmax increased proportionally following multiple-dose subcutaneous administration in the proposed dose range (1-3 mg).

Absorption
After subcutaneous injection of IMCIVREE, plasma concentrations of setmelanotide reached maximum concentrations at a median tmax of 8 h after dosing.

Distribution
The mean apparent volume of distribution of setmelanotide after subcutaneous administration of IMCIVREE 3 mg once daily was estimated to be 75.2 L. Protein binding of setmelanotide is 79.1%.

Elimination
The effective elimination half-life (t½) of setmelanotide was approximately 11 hours. The total apparent steady state clearance of setmelanotide following subcutaneous administration of IMCIVREE 3 mg once daily was estimated to be 7.15 L/h in a typical male patient weighing 120 kg (actual body weight) with normal renal function.

Metabolism
Setmelanotide is expected to be metabolized into small peptides by catabolic pathways.

Excretion
Approximately 39% of the administered setmelanotide dose was excreted unchanged in urine during the 24-hour dosing interval following subcutaneous administration of 3 mg once daily.

Specific Populations

No clinically significant differences in the pharmacokinetics of setmelanotide were observed based on sex or disease. The effect of age 65 years or older, pregnancy, or hepatic impairment on the pharmacokinetics of setmelanotide is unknown.

Pediatric Patients
IMCIVREE has been evaluated in pediatric patients aged 2 to less than 6 years, 6 to less than 12 years, and aged 12 to 17 years. Simulations were performed using population pharmacokinetic analysis for pediatric patients aged 2 to less than 6 years, following the maximum recommended doses in each of the body weight groups - 2 mg, 1.5 mg, 1 mg, and 0.5 mg in patients weighing ≥40 kg, 30 to <40 kg, 20 to <30 kg, and 15 to <20 kg, respectively. The analyses suggest that AUC and Cmax in pediatric patients aged 2 to less than 6 years are 52% and 75% higher in patients weighing ≥40 kg, 45% and 63% higher in patients weighing 30 to <40 kg, 24% and 38% higher in patients weighing 20 to <30 kg, and 17% and 14% lower in patients weighing 15 to <20 kg as compared to patients greater than or equal to 18 years (3 mg dose). For patients aged 6 to less than 12 years, the setmelanotide AUC and Cmax were 88% and 89% higher compared to patients greater than or equal to 18 years. For patients aged 12 to 17 years, the setmelanotide AUC and Cmax were both 26% higher as compared to patients aged greater than or equal to 18 years [ see Dosage and Administration (2.2, 2.3)].

Patients with Renal Impairment
Exposure parameters, AUC0-t and AUC0-inf, were approximately 13%-15%, 34%-35%, and 86% 96% higher for patients with mild, moderate, and severe renal impairment, respectively, as compared to patients with normal renal function [ see Dosage and Administration (2.4)].
Renal impairment did not appear to affect plasma protein binding. The average fraction unbound (fu) was approximately 0.2 and was independent of renal function.

Drug Interaction Studies
In vitro assessment of drug-drug interactions
Setmelanotide has low potential for pharmacokinetic drug-drug interactions related to cytochrome P450 (CYP), transporters and plasma protein binding.

In vivo assessment of drug-drug interactions

No clinical studies evaluating the drug-drug interaction potential of setmelanotide have been conducted.

12.6 Immunogenicity

The observed incidence of anti-drug antibodies (ADA) is highly dependent on the sensitivity and specificity of the assay. Differences in assay methods preclude meaningful comparisons of the incidence of ADA in the trials described below with the incidence of ADA in other trials, including those of IMCIVREE or of other setmelanotide products.

Across 5 clinical trials with an exposure time of at least 52 weeks, 4 of 245 subjects (1.6%) were positive for antibodies against setmelanotide. Anti-setmelanotide antibodies prevalence by indication: BBS 3/50 (6.0%), AS 1/8 (12.5%), POMC deficiency (0/16), PCSK1 deficiency (0/2), LEPR deficiency (0/21), and acquired HO (0/142). Reported titers among ADA‑positive subjects were generally low.

In 5 clinical trials with an exposure time of at least 52 weeks anti-α-MSH antibodies were measured in 17 of 245 subjects (6.9%). Anti-α-MSH antibodies by genetic deficiency: BBS 5/50 (10.0%), AS 1/8 (12.5%), POMC 1/16 (6.3%), LEPR 6/21 (28.6%), PCSK1 0/2 (0%), and acquired HO 4/142 (2.8%). The reported titer of ADA against α-MSH was generally low.

In patients with acquired HO, BBS, or POMC, PCSK1, or LEPR deficiency, there is insufficient information to characterize the ADA response to setmelanotide or α-MSH and the effects of ADA on pharmacokinetics, pharmacodynamics, safety, or effectiveness of setmelanotide products.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Setmelanotide was not carcinogenic in Tg.rasH2 mice at doses up to 10 mg/kg/day when given subcutaneously for 26 weeks.

Setmelanotide was not mutagenic or clastogenic in a bacterial reverse mutation test, an in vitrochromosome aberration test in human lymphocyte cultures, or an in vivobone marrow micronucleus study in rats.

There were no effects on the fertility of male rats subcutaneously administered up to 3.0 mg/kg/day setmelanotide, which represents 9 times the MRHD of 3 mg, based on AUC. No effects on the fertility of female rats were observed with subcutaneous administration up to 5 mg/kg/day setmelanotide, which represents 11 times the MRHD of 3 mg, based on AUC.

14.1 Acquired HO (Adults and Pediatric Patients Aged 4 Years and Older)

Clinical Trial Overview

The efficacy of IMCIVREE for weight reduction in adults and pediatric patients aged 4 years and older with acquired HO was assessed in a randomized, double-blinded, placebo-controlled 56- to 60-week clinical trial [Trial 1 ( NCT05774756)]. The trial enrolled patients 4 years and older with acquired HO due to hypothalamic injury or dysfunction. Adult patients had a BMI of ≥30 kg/m ²andpediatric patients had a BMI ≥95 ^thpercentile for age and sex.

In Trial 1, eligible patients were randomized to either setmelanotide or placebo and entered an up to 8-week dose titration period followed by a 52-week treatment period. Efficacy analyses were conducted for 142 patients.

A total of 142 patients with acquired HO were randomized and analyzed; 47% were adults, 31% were aged 12 to less than 18 years, and 23% were 4 to less than 12 years; 40% were male; 75% were White, 11% were Asian, 5% were Black or African American, and 9% had an unknown or not reported race; 11% were Hispanic or Latino ethnicity and less than 1% had an unknown or not reported ethnicity; and the mean BMI was 36 kg/m ²(range: 21-70 kg/m ²).

Effect of IMCIVREE on BMI in Patients with Obesity and a Clinical Diagnosis of Acquired HO

The proportion of patients who discontinued trial drug in Trial 1 were 10.6% of the IMCIVREE-treated group and 12.5% of the placebo-treated group.

The primary efficacy parameter was mean percent change in BMI from baseline after 52 weeks on a therapeutic regimen of setmelanotide compared to placebo. After 52 weeks of treatment at the therapeutic dose, the mean percent change in BMI compared to placebo was -18.40% (Table 9), and greater proportions of patients treated with IMCIVREE achieved at least 5%, 10%, and 15% BMI reduction compared to placebo (Table 9 and Figure 1).

The cumulative frequency distributions of change in BMI are shown in Figure 1 for Trial 1. One way to interpret this figure is to select a change in BMI of interest on the horizontal axis and note the corresponding proportions of patients (vertical axis) in each treatment group who achieved at least that degree of BMI reduction. For example, a vertical line arising from ‑10% change in BMI in Trial 1 intersects the IMCIVREE and placebo curves at approximately 61%, and 5%, respectively, which correspond to the values shown in Table 1.

Note: Based on observed percent change of BMI from baseline after 52 weeks treatment, and patient-level average of 100 multiply imputed datasets (washout MI method) for patients with missing values

A reduction of BMI Z-score and BMI 95 ^thpercentile for pediatric patients less than 18 years of age was observed.

In Trial 1, patients 12 years and older who were able to self-report their hunger (n=110), recorded their daily maximal hunger in a diary, which was then assessed by the Daily Hunger Questionnaire Item 2. Hunger was scored on an 11-point scale from 0 (“not hungry at all”) to 10 (“hungriest possible”). After 52 weeks of treatment at the therapeutic dose, IMCIVREE resulted in a statistically significant reduction in hunger compared to placebo (Table 10).

IMCIVREE resulted in a reduction in waist circumference and general numeric improvements in blood pressure, lipids, and glycemic parameters compared with placebo.

14.2 Bardet-Biedl Syndrome (Adults and Pediatric Patients Aged 6 Years and Older)

Clinical Trial Overview

The efficacy of IMCIVREE for weight reduction in adults and pediatric patients aged 6 years and older with obesity and a clinical diagnosis of Bardet-Biedl syndrome (BBS) were assessed in a 66-week clinical trial, which included a 14 week randomized, double-blind, placebo-controlled period and a 52-week open-label period (Trial 2 [ NCT03746522]). The trial enrolled patients aged 6 years and above with obesity and a clinical diagnosis of BBS. Adult patients had a BMI of ≥30 kg/m2 and pediatric patients had weight ≥97th percentile using growth chart assessments.

In Trial 2, eligible patients entered a 14-week, randomized, double-blind, placebo-controlled treatment period (Period 1) in which patients received IMCIVREE or placebo, followed by a 52 week open-label treatment period (Period 2) in which all patients received IMCIVREE. To maintain the blind during Period 1, dose titration to a fixed dose of 3 mg given subcutaneously once daily was performed during the first 2 weeks of both Period 1 and Period 2.

Efficacy analyses were conducted in 44 patients at the end of Period 1 (Week 14, placebo-controlled data) and in 31 patients during the active-treatment period, defined as the period from randomization to Week 52 in patients initially randomized to IMCIVREE, and from Week 14 to Week 66 in patients initially randomized to placebo. Analyses of the active-treatment period include patients who had either completed 52 weeks from the start of IMCIVREE treatment or discontinued the trial early at the time of the prespecified data cutoff.

A total of 44 patients with obesity and a clinical diagnosis of BBS were enrolled; 50% were adults, 32% were aged 12 to <18 years, and 18% were aged 6 to <12 years; 46% were male; 77% were White, 5% were Black or African American, 2% were Asian, and 16% had an unknown or not reported race; 2% were Hispanic or Latino ethnicity and 14% had an unknown or not reported ethnicity; and the mean BMI was 41.5 kg/m2 (range: 24.4-66.1 kg/m2) at baseline.

Effect of IMCIVREE on BMI in Patients with Obesity and a Clinical Diagnosis of BBS
In patients aged ≥6 years with obesity and a clinical diagnosis of BBS in Trial 2, the mean percent change in BMI after 52 weeks of IMCIVREE treatment was -7.9% (Table 11), 61.3% of patients achieved a ≥5% BMI decrease from baseline, and 38.7% had a ≥10% decrease in BMI (Table 12).

Table 11: Percent Change from Baseline in BMI after 52 Weeks from the Start of IMCIVREE Treatment in Patients Aged ≥6 Years with Obesity and a Clinical Diagnosis of BBS (Trial 2)*

Abbreviations: CI = confidence interval; SD = standard deviation *BBS patients (N=31) who completed 52 weeks from the start of IMCIVREE treatment or discontinued the trial early. Five patients who discontinued trial early were defined as 0 percent change.
Statistic	Result
Baseline BMI (kg/m 2)
Mean (SD)	41.8 (9.0)
Median	41.5
Min, Max	24.4, 61.3
BMI after 52 Weeks (kg/m 2)
Mean (SD)	38.6 (9.2)
Median	39.1
Min, Max	20.4, 60.9
95% CI	35.2, 41.9
Percent Change from Baseline to 52 Weeks (%)
Mean (SD)	-7.9 (6.7)
Median	-8.8
Min, Max	-25.4, 5.3
95% CI	-10.4, -5.5

Abbreviations: CI = confidence interval; SD = standard deviation *BBS patients (N=31) who completed 52 weeks from the start of IMCIVREE treatment or discontinued the trial early. Five patients who discontinued trial early were defined as not achieving 5% or 10% reduction.
Parameter	Statistic	Result
Patients* Achieving at Least 5% BMI Loss at 52 Weeks	%	61.3
	95% CI	42.2, 78.2
Patients* Achieving at Least 10% BMI Loss at 52 Weeks	%	38.7
	95% CI	21.8, 57.8

During the 14-week double-blind, placebo-controlled portion of Trial 2 (Period 1), there was a statistically significant difference in BMI reduction between the IMCIVREE-treated group and the placebo-treated group ( Table 13).

Table 13. Percent Change from Baseline in BMI after 14 Weeks of Treatment in Patients Aged ≥6 Years with Obesity and a Clinical Diagnosis of BBS (Trial 2)*

Abbreviations: CI = confidence interval; SD = standard deviation *BBS subjects who completed the 14-week double-blind, placebo-controlled period (N=44).
Parameter	IMCIVREE (N = 22)	Placebo (N = 22)
Baseline BMI (SD)	41.4 (10.0)	41.6 (10.1)
BMI at 14 Weeks (SD)	39.5 (9.9)	41.6 (9.9)
Percent Change from Baseline to 14 Weeks (SD)	-4.6 (4.1)	-0.1 (2.3)
Placebo-Adjusted Difference	-4.5
95% CI	-6.5, -2.5

Effect of IMCIVREE on Hunger in Patients with Obesity and a Clinical Diagnosis of BBS

In Trial 2, patients 12 years and older who were able to self-report their hunger (n=14), recorded their daily maximal hunger in a diary, which was then assessed by the Daily Hunger Questionnaire Item 2. Hunger was scored on an 11-point scale from 0 (“not hungry at all”) to 10 (“hungriest possible”). Weekly means of daily maximal hunger scores after 52 weeks from the start of IMCIVREE treatment are summarized in Table 14.

Hunger scores decreased in IMCIVREE-treated patients during the 14-week placebo-controlled period and during the open-label treatment period.

Table 14: Daily Hunger Scores – Change from Baseline in IMCIVREE-Treated Patients Aged ≥12 Years with Obesity and a Clinical Diagnosis of BBS After 52 Weeks From the Start of IMCIVREE Treatment (Trial 2)

Abbreviations: BBS = Bardet-Biedl syndrome; CI=confidence interval; Max=maximum; Min=minimum; NC=Not calculated; SD=Standard Deviation. Note: Baseline is the last assessment prior to initiation of setmelanotide in both trials. Note: The Daily Hunger Questionnaire is not administered to patients <12 years or to patients with cognitive impairment as assessed by the Investigator.
Timepoint	Statistic	Result
Baseline	N	14
	Mean (SD)	6.99 (1.893)
	Median	7.29
	Min, Max	4.0, 10.0
Week 52	N	14
	Mean (SD)	4.87 (2.499)
	Median	4.43
	Min, Max	2.0, 10.0
Change at Week 52	N	14
	Mean (SD)	-2.12 (2.051)
	Median	-1.69
	Min, Max	-6.7, 0.0

Supportive of IMCIVREE’s effect on weight loss, there were general numeric improvements in blood pressure, lipids, and waist circumference. However, because of the limited number of patients studied and the lack of a control group, the treatment effects on these parameters could not be accurately quantified.

14.3 POMC, PCSK1, and LEPR Deficiency (Adults and Pediatric Patients Aged 6 Years and Older)

Overview of Clinical Trials

The efficacy of IMCIVREE for weight reduction in adults and pediatric patients 6 years of age and older with obesity due to POMC, PCSK1, or LEPR deficiency were assessed in 2 identically designed, 1-year, open-label trials, each with an 8‑week, double-blind withdrawal period.

Trial 3 ( NCT02896192) enrolled patients aged 6 years and above with obesity and genetically confirmed or suspected POMC or PCSK1 deficiency. Trial 4 ( NCT03287960) enrolled patients aged 6 years and above with obesity and genetically confirmed or suspected LEPR deficiency. The trials enrolled patients with homozygous or presumed compound heterozygous pathogenic, likely pathogenic variants, or VUS for either the POMCor PCSK1genes (Trial 3) or the LEPRgene (Trial 4). In both trials, the local genetic testing results were centrally confirmed using Sanger sequencing. Patients with double heterozygous variants in 2 different genes were not eligible for treatment with IMCIVREE. In both trials, adult patients had a body mass index (BMI) of ≥30 kg/m ². Weight in pediatric patients was ≥95 ^th percentile using growth chart assessments.

IMCIVREE dose titration occurred over a 2- to 12-week period, followed by a 10-week, open-label treatment period with IMCIVREE. Patients who achieved at least a 5-kilogram weight loss (or at least 5% weight loss if baseline body weight was <100 kg) at the end of the open-label treatment period continued into a double-blind withdrawal period lasting 8 weeks, including 4 weeks of IMCIVREE followed by 4 weeks of placebo (investigators and patients were blinded to this sequence). Following the withdrawal sequence, patients re-initiated treatment with IMCIVREE at their therapeutic dose for up to 32 weeks.

Efficacy analyses were conducted in 21 patients (10 in Trial 3 and 11 in Trial 4) who had completed at least 1 year of treatment at the time of a prespecified data cutoff. Six additional patients enrolled in the trials (4 in Trial 3 and 2 in Trial 4) who had not yet completed 1 year of treatment at the time of the cutoff were not included in the efficacy analyses.

Of the 21 patients included in the efficacy analysis in Trials 3 and 4, 62% were adults and 38% were pediatric patients aged 16 years or younger.

In Trial 3, 50% of patients were female, 70% were White, and the median BMI was 40 kg/m ²(range: 26.6‑53.3) at baseline. In Trial 4, 73% of patients were female, 91% were White, and the median BMI was 46.6 kg/m ²(range: 35.8‑64.6) at baseline.

Effect of IMCIVREE on Body Weight in Patients with Obesity due to POMC, PCSK1, or LEPR Deficiency

In Trial 3, 80% of patients with obesity due to POMC or PCSK1 deficiency met the primary endpoint, achieving a ≥10% weight loss after 1 year of treatment with IMCIVREE.

In Trial 4, 46% of patients with obesity due to LEPR deficiency achieved a ≥10% weight loss after 1 year of treatment with IMCIVREE (Table 15).

Abbreviations: CI = confidence interval Note: The analysis set includes patients who received at least 1 dose of trial drug and had at least 1 baseline assessment. 1From the Clopper-Pearson (exact) method 2Testing the null hypothesis: Proportion =5%
Parameter	Statistic	Trial 3 (POMC or PCSK1) (N=10)	Trial 4 (LEPR) (N=11)
Patients Achieving at Least 10% Weight Loss at Year 1	n (%)	8 (80%)	5 (46%)
	95% CI 1	(44.4%, 97.5%)	(16.8%, 76.6%)
	P-value 2	<0.0001	0.0002

When treatment with IMCIVREE was withdrawn in the 16 patients who had lost at least 5 kg (or 5% of body weight if baseline body weight was <100 kg) during the 10 week open-label period in Trials 3 and 4, these patients gained an average of 5.5 kg in Trial 3 and 5.0 kg in Trial 4 over 4 weeks. Re initiation of treatment with IMCIVREE resulted in subsequent weight loss (see Figure 2).

Abbreviations: CI = confidence interval; SD = standard deviation Note: This analysis includes patients who received at least 1 dose of trial drug, had at least 1 baseline assessment. 1ANCOVA model containing baseline body weight as a covariate 2Testing the null hypothesis: mean percent change=0
Parameter	Statistic	Trial 3 (POMC or PCSK1) (N=10)	Trial 4 (LEPR) (N=11)
Baseline Body Weight (kg)	Mean (SD)	118.7 (37.5)	133.3 (26.0)
	Median	115.0	132.3
	Min, Max	55.9, 186.7	89.4, 170.4
1-Year Body Weight (kg)	Mean (SD)	89.8 (29.4)	119.2 (27.0)
	Median	84.1	120.3
	Min, Max	54.5, 150.5	81.7, 149.9
Percent Change from Baseline to 1 Year (%)	Mean (SD)	-23.1 (12.1)	-9.7 (8.8)
	Median	-26.7	-9.8
	Min, Max	-35.6, -1.2	-23.3, 0.1
	LS Mean 1	-23.12	-9.65
	95% CI 1	(-31.9, -14.4)	(-16.0, -3.3)
	P-value 2	0.0003	0.0074

Figure 2: Mean Percent Change in Body Weight from Baseline in Patients Aged ≥6 Years with Obesity due to POMC, PCSK1, or LEPR Deficiency by Visit (Trial 3 [N=9] and Trial 4 [N=7])

BL=Baseline (day of first dose)

V2 to V3 = variable dose titration period (2 to 12 weeks)

V3 to V6 = 10-week open-label treatment period

V6 to V8 = 8-week placebo withdrawal period (4 weeks active, 4 weeks placebo)

V8 to V12 = 32-week open-label treatment period

FV = Final visit; time point for primary efficacy analysis

Note: This figure includes patients who had lost at least 5 kg (or 5% of body weight if baseline body weight was <100 kg) during the 10-week open-label period.

Effect of IMCIVREE on Hunger in Patients with Obesity due to POMC, PCSK1, or LEPR Deficiency

In Trials 3 and 4, patients 12 years and older self-reported their daily maximal hunger in a diary, assessed by the Daily Hunger Questionnaire Item 2. Hunger was scored on an 11-point numeric rating scale from 0 (“not hungry at all”) to 10 (“hungriest possible”). Weekly means of daily hunger scores at Baseline and Week 52 are summarized in Table 17.

Table 17: Daily Hunger Scores – Change from Baseline at 1 Year in IMCIVREE-Treated Patients Aged ≥12 Years with Obesity due to POMC, PCSK1, or LEPR Deficiency in Trials 3 and 4 with Available Hunger Data

Note: This analysis includes patients aged 12 years and older who received at least 1 dose of study drug and had available data. Three patients in Study 2 had missing hunger data at Week 52. Hunger score was captured in a daily diary and was averaged to calculate a weekly score for analysis. Hunger ranged from 0 to 10 on an 11-point scale where 0 = “not hungry at all” and 10 = “hungriest possible.”
Parameter	Statistic	Hunger in 24 Hours
		Trial 3 (POMC or PCSK1(N=8)	Trial 4 (LEPR) (N=8)
Baseline Hunger Score	Median	7.9	7.0
	Median	7.0, 9.1	5.0, 8.4
1-Year Hunger Score	Min, Max	5.5	4.4
	Min, Max	2.5, 8.0	2.1, 8.0
Change from Baseline to 1 Year	Median	-2.0	-3.4
	Min, Max	-6.5, -0.1	-4.7, 1.0

Hunger scores generally worsened during the double-blind, placebo withdrawal period among those patients who had experienced an improvement from baseline, and scores improved when IMCIVREE was reinitiated. Supportive of IMCIVREE’s effect on weight loss, there were general numeric improvements in blood pressure, lipids, glycemic parameters, and waist circumference. However, because of the limited number of patients studied and the lack of a control group, the treatment effects on these parameters could not be accurately quantified.

14.4 POMC, PCSK1, and LEPR Deficiency and BBS (Pediatric Patients Aged 2 to Less Than 6 Years)

Clinical Trial Overview

The efficacy of IMCIVREE for weight reduction in pediatric patients aged 2 to less than 6 years with obesity due to POMC, PCSK1, or LEPR deficiency or BBS were assessed in a 52-week clinical trial [Trial 5 (NCT04966741)]. Patients with PCSK1 deficiency were eligible but noneenrolled. POMC and LEPR deficiency were confirmed by genetic testing demonstrating biallelic variants interpreted as pathogenic, likely pathogenic, or of undetermined significance; BBS was diagnosed clinically with genetic confirmation. Obesity was defined as baseline BMI ≥97thpercentile for age and sex and body weight ≥20 kg.

In Trial 5, IMCIVREE dose titration occurred over an 8-week period, followed by a 44-week open-label treatment period with IMCIVREE.

Twelve (12) patients were enrolled (3 patients with POMC deficiency, 4 patients with LEPR deficiency, and 5 patients with BBS); 58% were male; 58% were White, 8% were Asian, and 33% had an unknown or not reported race; 8% were Hispanic or Latino ethnicity and 17% had an unknown or not reported ethnicity; and the mean BMI was 29.9 kg/m2 (range: 19-43 kg/m2) at baseline.

Efficacy analyses were conducted in all 12 patients at the end of treatment.

Effect of IMCIVREE on BMI in Patients Aged 2 to Less Than 6 Years with POMC or LEPR Deficiency or BBS

In Trial 5, 8% of patients discontinued trial drug.

The mean percent change in BMI after 52 weeks of IMCIVREE treatment was -33.8%, -13.1%, and -9.7% in patients with POMC deficiency, LEPR deficiency, and BBS, respectively (Table 18).

Table 18: Percent Change from Baseline in BMI after 52 Weeks of IMCIVREE Treatment in Patients Aged 2 to Less Than 6 Years with Obesity due to POMC Deficiency, LEPR Deficiency, or BBS (Trial 5)

Statistic	POMC (N=3)	LEPR (N=4)	BBS (N=5)
Baseline BMI (kg/m 2)
N	3	4	5
Mean (SD)	27.8 (1.6)	39.3 (4.8)	23.7 (3.5)
Median	28.4	41.2	23.0
Min, Max	26.0, 28.9	32.2, 42.5	19.3, 29.0
BMI at Week 52 (kg/m 2)
N	3	4	5
Mean (SD)	18.3 (1.2)	34.0 (5.0) 2	21.4 (3.3)
Median	18.0	32.7	22.2
Min, Max	17.3, 19.7	29.5, 41.1	17.9, 25.2
Percent Change from Baseline to 52 Weeks (%)
Mean (SE)	-33.8 (4.7)	-13.1 (5.4) 3	-9.7 (4.0)
Median	-37.6	-15.1	-9.0
Min, Max	-39.3, -24.3	-22.1, 0	-21.6, 2.5
95% CI 1	-54.1, -13.4	-30.4, 4.2	-20.7, 1.3
Abbreviations: CI = confidence interval; SD = standard deviation 1Two-sided 95% CI is calculated with Student’s t-distribution. 2Using last observation carried forward (LOCF), the mean BMI (SD), median, min, and max at Week 52 are 34.9 (6.8), 32.7 29.5, and 44.9, respectively. Using observed data only, the mean BMI (SD), median, min, and max at Week 52 are 31.6 (1.9), 32.2, 29.5, and 33.1, respectively. 3Week 52 results are based off baseline observation carried forward (BOCF) for 1 patient lost to follow up after Week 8. Results using last observation carried forward are -10.8 (-34.4, 12.8) and using observed data excluding 1 patient lost to follow up are –17.4 (-37.2, 2.4).

Supportive of IMCIVREE’s effect on weight loss, general numeric improvements in waist circumference were observed.