Primary Objective: To evaluate the efficacy of alirocumab (75 or 150 milligrams \[mg\] depending on body weight \[BW\]), administered every 2 weeks (Q2W), on low-density lipoprotein cholesterol (LDL-C) levels at Week 12 of treatment in children and adolescents with homozygous familial hypercholesterolemia (hoFH) of 8 to 17 years of age on top of background treatments. Secondary Objectives: * To evaluate the efficacy of alirocumab after 24 and 48 weeks of treatment on LDL-C levels. * To evaluate the effects of alirocumab on other lipid parameters (eg, apolipoprotein B \[Apo B\], non-high density lipoprotein cholesterol \[non-HDL-C\], total cholesterol \[Total-C\], high density lipoprotein cholesterol \[HDL-C\], lipoprotein a \[Lp (a)\], triglycerides \[TG\], apolipoprotein A-1 \[Apo A-1\] levels) after 12, 24, and 48 weeks of treatment. * To evaluate the safety and tolerability of alirocumab up to 48 weeks of treatment.
The study duration was up to 62 weeks, which included (if needed) a run-in period of up to 4 weeks, a screening period of up to 2 weeks, a treatment period of up to 48 weeks, and a follow-up of 8 weeks.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
18
Pharmaceutical form: solution for injection in pre-filled syringe, Route of administration: subcutaneous (SC)
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: capsule, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: oral suspension, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: tablet, Route of administration: oral
Pharmaceutical form: capsule, Route of administration: oral
Investigational Site Number 0760001
São Paulo, Brazil
Investigational Site Number 1240001
Québec, Canada
Investigational Site Number 2080001
Viborg, Denmark
Investigational Site Number 4840006
Oaxaca City, Mexico
Investigational Site Number 5280001
Amsterdam, Netherlands
Investigational Site Number 6430002
Kemerovo, Russia
Investigational Site Number 7050001
Ljubljana, Slovenia
Investigational Site Number 7240001
A Coruña, Spain
Investigational Site Number 1580001
Taipei, Taiwan
Investigational Site Number 7920001
Izmir, Turkey (Türkiye)
Percent Change From Baseline in Low-Density Lipoprotein Cholesterol (LDL-C) at Week 12: Intent-to-Treat (ITT) Analysis
Adjusted least square (LS) means and standard errors were obtained from the mixed model analysis with repeated measures (MMRM) to account for missing data using all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis).
Time frame: Baseline to Week 12
Percent Change From Baseline in Low-Density Lipoprotein Cholesterol at Week 12: On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline on-treatment data from Week 4 to Week 48 (on-treatment Analysis).
Time frame: Baseline to Week 12
Percent Change From Baseline in Low-Density Lipoprotein Cholesterol at Weeks 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 24 and 48
Percent Change From Baseline in Apolipoprotein (Apo) B at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percent Change From Baseline in Non-High Density Lipoprotein Cholesterol (Non-HDL-C) at Weeks 12, 24 and 48 - ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percent Change From Baseline in Total Cholesterol (Total-C) at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Weeks 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percent Change From Baseline in Lipoprotein a (Lp) (a) at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted means and standard errors were obtained from a multiple imputation approach followed by a robust regression model including all available post-baseline data from Week 4 to Week 48 regardless of status on-or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percent Change From Baseline in High Density Lipoprotein Cholesterol (HDL-C) at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Weeks 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percent Change From Baseline in Fasting Triglycerides (TG) at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted means and standard errors were obtained from a multiple imputation approach followed by a robust regression model including all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percent Change From Baseline in Apolipoprotein A1 (Apo A1) at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Week 4 to 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Percentage of Participants Reporting >=15 Percent (%) Reduction in LDL-C Level at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted Percentage were obtained from a multiple imputation approach for handling of missing data including all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Absolute Change From Baseline in LDL-C Level at Weeks 12, 24 and 48: ITT Analysis/On-treatment Analysis
Adjusted LS means and standard errors were obtained from the MMRM model to account for missing data using all available post-baseline data from Week 4 to Week 48 regardless of status on- or off-treatment used in the model (ITT analysis). Although separate analyses of all available data (ITT analysis) and only data collected within a defined time window (On-treatment analysis) were planned, if all values used in the ITT approach were within the on-treatment time window, the on-treatment analysis would be identical to the ITT analysis, thus the results would be identical and a single outcome measure presenting the results for both types of analysis would be provided.
Time frame: Baseline to Weeks 12, 24 and 48
Number of Participants With Tanner Staging at Baseline, Weeks 12, 24 and 48
Tanner stage defines physical measurements of development in children and adolescent based on external primary and secondary sex characteristics. Participants were evaluated for pubic hair distribution, breast development (only females) and genital development (only males), and classified in 3 categories as: Prepubescent (defined as a person just before start of the development of adult sexual characteristics), Pubescent (defined as a person at or approaching the age of puberty), Postpubescent (sexually mature or a person who has completed puberty).
Time frame: Baseline, Weeks 12, 24 and 48
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