A Phase 1/2 interventional study of Crovalimab and Placebo in Paroxysmal Hemoglobinuria, Nocturnal, sponsored by Hoffmann-La Roche. Completed at 15 sites in 7 countries. Open to participants aged 18 Years to 75 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-01.
Sponsored by Hoffmann-La Roche · Phase 1/2, Interventional, and Treatment
This is a Phase I/II, first-in-human study consisting of four sequential parts and an open-label extension (OLE). The safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of single doses of crovalimab will be evaluated in healthy volunteers (HV) during part 1. The safety, tolerability, PK and PD of multiple doses of crovalimab will be evaluated in participants with paroxysmal nocturnal hemoglobinuria (PNH) in parts 2, 3, 4, and OLE of the study. Efficacy of crovalimab will be evaluated in Parts 2, 3, and 4.
188 studies on the registry are indexed under Hemoglobinuria, Paroxysmal; 48 are open to participants now.
This study's enrollment of 59 is above the median of 34 across 147 interventional studies indexed under Hemoglobinuria, Paroxysmal.
Browse Hemoglobinuria, Paroxysmal studies →Hoffmann-La Roche is the lead sponsor of 2,061 studies on the registry; 85 are open to participants now.
Of its 319 completed or terminated interventional studies of FDA-regulated products, 239 (75%) have results posted.
Counted across the registry records on this site, refreshed daily.
Part 1 (HVs only):
Parts 2, 3 and 4 (PNH participants only):
Part 2 and 4 (currently untreated PNH participants who are candidates for treatment with complement inhibitors only):
Part 3 and 4 (PNH participants currently treated with eculizumab only):
OLE only - PNH participants:
All Parts:
Exclusion Criteria:
Part 1 (HVs only):
Parts 2, 3 and 4 - PNH participants only:
Part 3 and 4 - PNH patients only:
All Parts:
Healthy participants will receive a single dose of crovalimab in each dose-escalation cohort of Part 1. Crovalimab will be administered at a starting dose of 75 milligrams (mg) intravenous (IV) infusion. Doses are planned to be escalated up to Cohort 5.
Drug: Crovalimab
Healthy participants will receive a single dose of crovalimab matching placebo in each dose-escalation cohort of Part 1.
Drug: Placebo
PNH participants will receive 3 single ascending doses (375 mg IV, 500 mg IV, 1000 mg IV of crovalimab) on Days 1, 8, and 22 followed by weekly crovalimab administrations up to a maximum of 5 months. Weekly crovalimab administrations will start no earlier than Day 36. The starting dose of Part 2 is based on data from Part 1 of the study.
Drug: Crovalimab
Participants will receive crovalimab at a dose of 1000 mg on Day 1 and 170 mg weekly (QW) starting on Day 8 for a maximum treatment duration of 5 months.
Drug: Crovalimab
Participants will receive crovalimab at a dose of 1000 mg on Day 1 and 340 mg every 2 weeks (Q2W) for a maximum treatment duration of 5 months.
Drug: Crovalimab
Participants will receive crovalimab at a dose of 1000 mg on Day 1 and 680 mg every 4 weeks (Q4W) starting on Day 8 for a maximum treatment duration of 5 months.
Drug: Crovalimab
PNH Participants pretreated with eculizumab will receive crovalimab: Participants \>/= 100 kilograms (kg): loading dose of 1500 mg IV on Day 1; Participants \< 100 kg: loading dose of 1000 mg IV on Day 1. In all Participants, the remainder of the loading series schedule will be 340 mg subcutaneous (SC) on Days 2, 8, 15, and 22. For Participants \>/= 100 kg, maintenance dosing will be 1020 mg SC on week 5 and then Q4W thereafter. Patients \< 100 kg will receive a maintenance dose of 680 mg SC on the same schedule.
Drug: Crovalimab
Treatment naïve PNH Participants will receive: Participants \>/= 100 kg: loading dose of 1500 mg IV on day 1; Participants \< 100 kg: loading dose of 1000 mg IV on day 1. In all Participants, the remainder of the loading series schedule will be 340 mg SC on Days 2, 8, 15, and 22. For Participants \>/= 100 kg, maintenance dosing will be 1020 mg SC on week 5 and then Q4W thereafter. Patients \< 100 kg will receive a maintenance dose of 680 mg SC on the same schedule.
Drug: Crovalimab
PNH Participants who participated in Parts 2, 3 and 4 and who derive clinical benefit from crovalimab may enroll into OLE. Participants will either receive 680 mg SC Q4W (body weight \>/= 40 kg to \< 100 kg) or 1020 mg SC Q4W (body weight \>/= 100 kg) for up to a maximum treatment duration of ten years from entry into OLE.
Drug: Crovalimab
Crovalimab will be administered as per schedule described in individual arm.
Placebo will be administered as per schedule described in Part 1 placebo arm.
Part 1: Percentage of Participants With Dose-Limiting Events (DLEs)
Time frame: Baseline up to approximately 3 months
Part 1: Percentage of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
Time frame: Baseline up to approximately 3 months
Part 2: Percentage of Participants With AEs and SAEs
Time frame: Baseline up to approximately 8 months
Part 3: Percentage of Participants With AEs and SAEs
Time frame: Baseline up to approximately 8 months
Part 4: Percentage of Participants With AEs and SAEs
Time frame: Baseline up to approximately 8 months
Part 2: Terminal Complement Activity in Serum as Assessed by Ex Vivo Liposome Immunoassay (LIA)
Time frame: Baseline up to Day 224
Part 3: Terminal Complement Activity as Assessed by Ex Vivo Liposome Lysis in Serum Using the LIA
Time frame: Baseline up to Day 224
Part 4: Terminal Complement Activity in Serum as Assessed by Ex Vivo Liposome Immunoassay (LIA)
Time frame: Baseline up to Day 224
OLE: Percentage of Participants With AEs and SAEs
Time frame: OLE: Week 21 up to Week 567
Part 1: Terminal Complement Activity as Assessed by Ex Vivo Liposome Immunoassay (LIA)
Time frame: Part 1: Baseline up to Day 91 (assessed at predose [Hour 0], end of infusion [EOI] [1 Hour], Hours 2, 6, 12 on Day 1; Days 2, 3, 4, 5, 7, 14, 21, 28, 35, 42, 56, 91)
Part 2: Serum Lactate Dehydrogenase (LDH) Levels
Time frame: Predose (Hour 0), Hours 10-12 on Days 1, 8; Days 2, 5, 9, 15, 22, 29, 36, 43, 50, 64, 78, 92, 106, 120, 134, 224
Part 3: Serum LDH Levels
Time frame: Part 3: Predose (Hour 0), Hours 10-12 on Day 1; predose (Hour 0), on Days 2, 8, 15, 22, 29, 36, 64, 78, 92, 106, 134; Day 224
Part 4: Serum LDH Levels
Time frame: Part 4: Predose (Hour 0), Hour 6 on Day 1; predose (Hour 0), on Days 2, 8, 15, 22, 29, 43, 57, 85, 113, 134; Day 224
Part 1: Total Complement Component 5 (C5) Concentration
Time frame: Part 1: Predose (Hour 0), EOI (1 Hour), Hours 2, 6, 12 on Day 1; Days 2, 3, 4, 5, 7, 14, 21, 28, 35, 42, 56, 91
Part 2: Total C5 Concentration
Time frame: Part 2: Predose (Hour 0), EOI (1 Hour), Hours 2, 6, 10-12 on Day 1; Days 2, 5, 9, 15, 29, 224; predose [Hour 0], EOI [1 Hour], Hours 10-12 on Days 8, 22; predose [Hour 0] on Days 36, 43, 50, 64, 78, 92, 106, 120, 134
Part 3: Total C5 Concentration
Time frame: Part 3: Predose (Hour 0), EOI (1 Hour), Hours 2 and 6 on Day 1; predose (Hour 0), on Days 2, 8, 15, 22, 29, 36, 43, 50, 57, 64, 78, 92, 106; Day 224
Part 4: Total C5 Concentration
Time frame: Part 4: Predose (Hour 0), EOI (1 Hour), Hours 2, 6 on Day 1; predose (Hour 0), on Days 2, 8, 15, 22, 29, 57, 85, 113; Days 43, 134, 224
Part 1: Free C5 Concentration
Time frame: Part 1: Predose (Hour 0), EOI (1 Hour), Hours 2, 6, 12 on Day 1; Days 2, 3, 4, 5, 7, 14, 21, 28, 35, 42, 56, 91
Part 2: Free C5 Concentration
Time frame: Part 2: Predose (Hour 0), EOI (1 Hour), Hours 2, 6, 10-12 on Day 1; Days 2, 5, 9, 15, 29, 224; predose [Hour 0], EOI [1 Hour], Hours 10-12 on Days 8, 22; predose [Hour 0] on Day 36, 43, 50, 64, 78, 92, 106, 120, 134
Part 3: Free C5 Concentration
Time frame: Part 3: Predose (Hour 0), EOI (1 Hour), Hours 2, 6 on Day 1; predose (Hour 0), on Days 2, 8, 15, 22, 29, 36, 43, 50, 57, 64, 78, 92, 106; Day 224
Part 4: Free C5 Concentration
Time frame: Part 4: Predose (Hour 0), EOI (1 Hour), Hours 2, 6 on Day 1; predose (Hour 0), on Days 2, 8, 15, 22, 29, 57, 85, 113; Days 43, 134, 224
Part 2: Change From Baseline in Fatigue as Measured by Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Scale Score at Day 64
Time frame: Baseline, Day 64
Part 3: Change From Baseline in Fatigue as Measured by FACIT-Fatigue Scale Score at Day 8, 22, 50, 78, 106, and 134
Time frame: Baseline, Day 8, 22, 50, 78, 106, 134
Part 4: Change From Baseline in Fatigue as Measured by FACIT-Fatigue Scale Score at Day 8, 22, 57, 85, 113 and 134
Time frame: Baseline, Day 8, 22, 57, 85, 113, 134
Part 2: Change From Baseline in Health-Related Quality of Life (HRQoL) as Measured by European Organization for Research and Treatment of Cancer Core Quality of Life Questionnaire (EORTC QLQ-C30) Score at Day 64
Time frame: Baseline, Day 64
Part 3: Change From Baseline in HRQoL as Measured by EORTC QLQ-C30 Score at Day 78 and 134
Time frame: Baseline, Day 78, 134
Part 4: Change From Baseline in HRQoL as Measured by EORTC QLQC30 Score at Day 85 and 134
Time frame: Baseline, Day 85, 134
Part 2: Participant Treatment Satisfaction as Measured by Treatment Satisfaction Questionnaire for Medication (TSQM) Score at Day 8, 22, 36, 50 and 64
Time frame: Baseline, Day 8, 22, 36, 50, 64
Part 3: Participant Treatment Satisfaction as Measured by TSQM Score at Day 8 and 50
Time frame: Baseline, Day 8, 50
Part 4: Participant Treatment Satisfaction as Measured by TSQM Score at Day 8 and 57
Time frame: Baseline, Day 8, 57
Part 2: Number of Packed Red Blood Cell (RBC) Units Transfused per Participant
Time frame: Baseline up to Day 224
Part 3: Number of Packed RBCs Units Transfused per Participant
Time frame: Baseline up to Day 224
Part 4: Number of Packed RBCs Units Transfused per Participant
Time frame: Baseline up to Day 224
Part 2: Percentage of Participants With Packed RBC Units Transfused
Time frame: Baseline up to Day 224
Part 3: Percentage of Participants With Packed RBC Units Transfused
Time frame: Baseline up to Day 224
Part 4: Percentage of Participants With Packed RBC Units Transfused
Time frame: Baseline up to Day 224
Part 1: Percentage of Participants With Anti-Drug Antibodies (ADAs) to Crovalimab
Time frame: Part 1: Day 1 up to Day 91 (assessed at predose [Hour 0] on Day 1; on Days 14, 28, 56, 84, and 91)
Part 2: Percentage of Participants With ADAs to Crovalimab
Time frame: Part 2: Day 1 up to Day 224 (assessed at predose [Hour 0] on Days 1, 8, 50, 106, 134); Days 29, 224
Part 3: Percentage of Participants With ADAs to Crovalimab
Time frame: Part 3: Day 1 up to Day 106 assessed at predose [Hour 0] on Days 1, 8, 29, 64, and 106; Day 224
Part 4: Percentage of Participants With ADAs to Crovalimab
Time frame: Day 1 up to Day 224 (assessed at predose [Hour 0] on Days 1, 8, 29, 113); Days 134, 224
OLE: Total C5 Concentration
Time frame: OLE: Predose (Hour 0) on Week 36 up to Week 521
OLE: Serum LDH Levels
Time frame: OLE: Predose (Hour 0) on Week 28 up to Week 521
OLE: Terminal Complement Activity in Serum as Assessed by Ex Vivo Liposome Immunoassay (LIA)
Time frame: OLE: Week 36 up to Week 521
Part 2: Percentage of Participants With LDH Below Upper Limit of Normal (ULN)
Time frame: Baseline up to Day 224
Part 3: Percentage of Participants With LDH Below ULN
Time frame: Baseline up to Day 224
Part 4: Percentage of Participants With LDH Below ULN
Time frame: Baseline up to Day 224
Part 2: Percentage of Participants With Complement Suppression
Time frame: Baseline up to Day 134
Part 3: Percentage of Participants With Complement Suppression
Time frame: Baseline up to Day 134
Part 4: Percentage of Participants With Complement Suppression
Time frame: Baseline up to Day 134
Part 2: Monthly Rate of pRBC Transfusions per Participant
Time frame: Baseline up to 10 years
Part 3: Monthly Rate of pRBC Transfusions per Participant
Time frame: Baseline up to 10 years
Part 4: Monthly Rate of pRBC Transfusions per Participant
Time frame: Baseline up to 10 years
Part 2: Proportion of Transfusion-Free Participants
Time frame: Baseline up to 10 years
Part 3: Proportion of Transfusion-Free Participants
Time frame: Baseline up to 10 years
Part 4: Proportion of Transfusion-Free Participants
Time frame: Baseline up to 10 years
Part 2: Annual Rate of Transfusion Avoidance per Participant
Time frame: Baseline up to 10 years
Part 3: Annual Rate of Transfusion Avoidance per Participant
Time frame: Baseline up to 10 years
Part 4: Annual Rate of Transfusion Avoidance per Participant
Time frame: Baseline up to 10 years
Part 2: Annual Rate of Breakthrough Hemolysis (BTH)
Time frame: Baseline up to 10 years
Part 3: Annual Rate of Breakthrough Hemolysis (BTH)
Time frame: Baseline up to 10 years
Part 4: Annual Rate of Breakthrough Hemolysis (BTH)
Time frame: Baseline up to 10 years
Plan to share: Yes — Qualified researchers may request access to individual patient level data through the clinical study data request platform (www.vivli.org). Further details on Roche's criteria for eligible studies are available here (https://vivli.org/members/ourmembers/). For further details on Roche's Global Policy on the Sharing of Clinical Information and how to request access to related clinical study documents, see here (https://www.roche.com/innovation/process/clinical -trials/data-sharing/)
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