Une étude évaluant l'efficacité, l'innocuité, la pharmacocinétique et la pharmacodynamique du crovalimab chez des participants atteints d'hémoglobinurie paroxystique nocturne (HPN) non préalablement traités par inhibition du complément (COMMODORE 3)

Participants will receive a loading series of crovalimab comprised of an intravenous (IV) dose on Day 1, followed by weekly crovalimab subcutaneous (SC) doses for 4 weeks on Week 1 Day 2, then on Weeks 2, 3, and 4. Maintenance SC dosing will begin at Week 5 and will continue Q4W (every 4 weeks) thereafter for a total of 24 weeks of study treatment. After 24 weeks of crovalimab treatment, participants who derive benefit from the drug may continue to receive crovalimab.

Crovalimab will be administered at a dose of 1000 milligrams (mg) IV (for participants with body weight between 40 and 100 kg) or 1500 mg IV (for participants with body weight ≥ 100 kg) on Week 1 Day 1. On Week 1 Day 2 and on Weeks 2, 3 and 4, it will be administered at a dose of 340 mg SC. For Week 5 and Q4W thereafter, it will be administered at a dose of 680 mg SC (for participants with body weight between 40 and 100 kg) or 1020 mg SC (for participants with body weight ≥ 100 kg). Dosing schedule will be as described above.

A Generalized Estimating Equation (GEE) was used to estimate the population-average percentage of the participants with hemolysis control (measured by lactate dehydrogenase (LDH) ≤1.5 x upper limit of normal (ULN)) from Week 5 to Week 25 taking account of the intra-patient and inter-patient correlation between LDH control statuses across visits. The dependent variable was the binary indicator for hemolysis control. Independent variables are categorical effects of visits, continuous baseline LDH.

TA was defined as participants who were packed red blood cell (pRBC) transfusion-free and did not require transfusion per protocol-specified guidelines. TA within 24 weeks prior to screening was based on the pRBC transfusion history in the medical records. Reported in this outcome measure is the difference in the percentage of participants between "baseline through Week 25" and "within 24 weeks prior to screening". 95% Confidence Interval (CI) for the difference between the percentage of participants with transfusion avoidance between Pre-screening and Post-baseline is calculated using the Newcombe method.

Screening= Day -28 to Day -1 and Baseline= Day 1.

BTH was defined as at least one new or worsening symptom or sign of intravascular hemolysis (fatigue, hemoglobinuria, abdominal pain, shortness of breath [dyspnea], anemia [hemoglobin < 10 grams per deciliter (g/dL)], major adverse vascular event [MAVE, including thrombosis], dysphagia, or erectile dysfunction) in the presence of elevated LDH ≥2xULN after a prior LDH reduction to ≤1.5xULN from the start of study treatment. As pre-specified in the SAP participants withdrawing before Week 25 were deemed to have experienced a BTH event. Percentages have been rounded off to the first decimal point.

Stabilized hemoglobin was defined as avoidance of a ≥2 g/dL decrease in hemoglobin level from baseline, in the absence of transfusion. As pre-specified in the SAP participants withdrawing before Week 25 were deemed to not have hemoglobin stabilization.

Fatigue was assessed using functional assessment of chronic illness therapy-fatigue (FACIT-F) scale. FACIT-F is a self-assessment questionnaire with a 7-day recall period and 13 items evaluating fatigue and its impact on daily life activities. Items are scored on a response scale that ranges from 0 ("not at all") to 4 ("very much so"). Relevant items are reverse scored, and all the items are summed to create a total score range from 0 to 52, with 0 being the worst possible score and 52 being the best possible score. A higher score indicates low fatigue severity. A positive mean change indicates improvement. FACIT-F was assessed in adult participants only. FACIT-F assessment was unintentionally missed in the Schedule of Activities (SoA) table, which site used to guide the assessments at each timepoint. Therefore, data were not collected at Week 25.