Measure Liver Fat Content After ISIS 301012 (Mipomersen) Administration

Phase 2

Completed

Conditions: Metabolism, Inborn Errors
Genetic Diseases, Inborn
Congenital Abnormalities
Metabolic Disorder
Hypercholesterolemia
Hyperlipidemias
Metabolic Diseases
Hypolipoproteinemias
Lipid Metabolism Disorders
Lipid Metabolism, Inborn Errors

Interventions: Drug: mipomersen
Drug: Placebo

Registration Number: NCT00362180

Lead Sponsor: Kastle Therapeutics, LLC

Brief Summary: This study will assess what, if any, effect that ISIS 301012 (mipomersen) has on liver triglyceride content in multiple groups of subjects with varying degrees of risk for hepatic steatosis. In order to enroll subject groups with varying degrees of risk, the study has included multiple cohorts (Cohorts A-G). Additions and removal of cohorts has been accomplished with protocol amendments.

Detailed Description: This was a randomized, double-blind, placebo-controlled study to measure the effect of treatment with mipomersen on liver triglyceride (TG) content in patients with varying degrees of hyperlipidemia and risk for hepatic steatosis.

The original study design included 4 cohorts (Cohorts A through D). Subsequent protocol amendments added 3 cohorts (Cohorts E, F, and G) to the study, truncated the enrollment of Cohort D, and eliminated Cohorts B and C. The study consisted of up to a 3-week screening period; a 4-week (Cohorts A and D), 13-week (Cohort E), or 52-week (Cohort G) treatment period; and a 20-week post-treatment follow-up period. Cohort F was an observational cohort, and therefore, was not treated with study drug. Patients in this cohort underwent a 15-week Magnetic resonance spectroscopy (MRS) and ultrasound evaluation period.

The study cohorts are:

Cohort A: Healthy volunteers with LDL-C \<140 mg/dL (3.6 mmol/L), serum TG \<200 mg/dL (2.3 mmol/L), hemoglobin A1c (HbA1c) \<6.0%, and hepatic TG content \<5% (as measured by MRS at screening). Patients were randomized to mipomersen 200 mg or placebo and treated for 4 weeks.

Cohorts B+C were eliminated in a protocol amendment prior to enrolling any patients and are not discussed further.

Cohort D: In an amendment to the protocol, Cohort D was closed to enrollment. One patient had already been enrolled in the study prior to the amendment. The patient enrolled in this cohort had impaired fasting glucose (defined as fasting blood glucose \>6 mmol/L and \<7 mmol/L) and mixed dyslipidemia (LDL-C \<215 mg/dL \[5.6 mmol/L\] and serum TG \>200 mg/dL \[2.3 mmol/L\]). The patient was treated with mipomersen 200 mg for 4 weeks.

Cohort E: Patients with uncomplicated heterozygous familial hypercholesterolemia (HeFH) (Alanine aminotransferase (ALT) ≤1.5 \* upper limit of normal Upper limit of normal (ULN), no evidence of insulin resistance or metabolic syndrome, and hepatic TG content \<5% by MRS at screening). Patients were to remain on their baseline statin ± ezetimibe regimen but were to wash out from other lipid-lowering agents (e.g., fenofibrate, non-dietary omega-3 fatty acids, and niacin) at least 8 weeks prior to the MRS at screening. Patients were randomized to either mipomersen 200 mg or placebo for 13 weeks.

Cohort F: Patients with familial hypobetalipoproteinemia (FHBL) (a documented APOB gene mutation that results in the expression of a truncated form of apo B). Patients in this cohort were evaluated by MRS, ultrasound, and laboratory tests; however, they were not treated with mipomersen or placebo.

Cohort G: Patients with well-controlled type 2 diabetes mellitus (HbA1c ≤8.0%), hypercholesterolemia (LDL-C \>100 mg/dL (2.59 mmol/L), and normal serum TG levels (≤200 mg/dL \[2.26 mmol/L\]). Patients were to have been on a stable dose of antidiabetic and lipid-lowering medications \>3 months prior to screening and were expected to remain stable for the duration of the study. Patients were randomized to either mipomersen 200 mg or placebo for 26 weeks, followed by 26 additional weeks of mipomersen 200 mg. Recruiting difficulties caused this cohort to close early.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 38

Inclusion Criteria

Group A - are healthy subjects
Group D - has impaired fasting glucose and mixed dyslipidemia
Group E - has a diagnosis of Heterozygous Familial Hypercholesterolemia (HeFH) and on stable lipid-lowering therapy for 3 months
Group F - has a diagnosis of Familial Hypobetalipoproteinemia (FHBL)
Group G - has a diagnosis of Diabetes and hypercholesterolemia

Exclusion Criteria

Medical, surgical, laboratory or other conditions which in the judgment of the Physician Investigator would make the subject unsuitable for enrollment, or potentially interfere with subject participation or completion of the study.

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Cohort G: placebo followed by mipomersen	Placebo	Participants with well-controlled Type 2 diabetes mellitus, hypercholesterolemia, and normal triglyceride levels were treated with placebo weekly for 26 weeks, followed by open-label mipomersen 200 mg weekly for an additional 26 weeks.
Cohort D: placebo	Placebo	Participants with impaired fasting glucose and mixed dyslipidemia who were treated with 6 injections of placebo over the course of 4 weeks. Injections were given subcutaneously (sc) on days 1, 4, 8, 11, 15 and 22.
Cohort A: placebo	Placebo	Healthy volunteers treated with 6 injections of placebo over the course of 4 weeks. Injections were given subcutaneously (sc) on days 1, 4, 8, 11, 15 and 22.
Cohort E: placebo	Placebo	Participants with uncomplicated heterozygous familial hypercholesterolemia (HeFH) treated with weekly placebo injections for 13 weeks.
Cohort D: mipomersen	mipomersen	Participants with impaired fasting glucose and mixed dyslipidemia who were treated with 6 injections of mipomersen 200 mg over the course of 4 weeks. Injections were given subcutaneously (sc) on days 1, 4, 8, 11, 15 and 22.
Cohort A: mipomersen	mipomersen	Healthy volunteers treated with 6 injections of mipomersen 200 mg over the course of 4 weeks. Injections were given subcutaneously (sc) on days 1, 4, 8, 11, 15 and 22.
Cohort E: mipomersen	mipomersen	Participants with uncomplicated heterozygous familial hypercholesterolemia (HeFH) treated with weekly mipomersen 200 mg injections for 13 weeks.
Cohort G: placebo followed by mipomersen	mipomersen	Participants with well-controlled Type 2 diabetes mellitus, hypercholesterolemia, and normal triglyceride levels were treated with placebo weekly for 26 weeks, followed by open-label mipomersen 200 mg weekly for an additional 26 weeks.
Cohort G: mipomersen	mipomersen	Participants with well-controlled Type 2 diabetes mellitus, hypercholesterolemia, and normal triglyceride levels were treated with mipomersen 200 mg weekly for 26 weeks, followed by open-label mipomersen 200 mg weekly for an additional 26 weeks.

Primary Outcome Measures

Name	Time	Method
Change From Baseline in Liver Triglyceride (TG) Content As Measured by Magnetic Resonance Spectroscopy (MRS)	Baseline, Day 26, Day 99	Localized proton MRS was used to quantify liver TG concentration. All MRS imaging of the liver was performed using the same 1.5T scanner. The instructions were to cover the entire liver (from just above the dome to just below the inferior tip) using a qualified imaging technique (Yokoo, 2009, Radiology). Liver fat quantification was performed by determining the liver fat fraction (%) derived from MRS using selected Regions of Interest (ROI). The analyst typically looked for the branching of the right portal vein and mapped slices from one scan to the next. There were typically 2 ROIs in the right lobe and 1 in the left lobe. Magnetic resonance spectroscopy imaging ROIs between different scans were selected using anatomical landmarks for both time points.

Secondary Outcome Measures

Name	Time	Method
Baseline Low-Density Lipoprotein Cholesterol	Baseline	Samples were taken following overnight fast.
Percent Change in Total Cholesterol From Baseline to Day 99	Day 26 and Day 99	Samples were taken following an overnight fast.
Percent Change in Apolipoprotein B From Baseline to Day 99	Day 26 and Day 99	Samples were taken following an overnight fast.
Baseline Apolipoprotein B	Baseline	Samples were taken following an overnight fast.
Percent Change in Low-Density Lipoprotein Cholesterol From Baseline to Day 99	Day 26 and Day 99	Samples were taken following an overnight fast.
Baseline Total Cholesterol	Baseline	Samples were taken following an overnight fast.