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Trial · NCT05186753

Registered outcomes18

Each outcome the trial registered, primary first, in ClinicalTrials.gov's words.

ListOutcomeTime frameDescription
PrimaryPart 1: Determine recommended dose of bezuclastinib (CGT9486) in subjects with NonAdvSM3 monthsSelection of the recommended dose to be used in subsequent parts of the study.
PrimaryPart 2: Efficacy of bezuclastinib at the selected dose versus placebo24 WeeksMean absolute change on the Mastocytosis Symptom Severity Daily Diary (MS2D2)
PrimaryPart 3: Safety and tolerability of bezuclastinib as assessed by number of adverse eventsUp to 5 yearsCTCAE v5
SecondaryPart 2: Proportion of subjects who had at least 50% reduction in serum tryptase24 weeks
SecondaryPart 2: Proportion of subjects who had at least a 50% reduction in peripheral blood D816V allele fraction24 weeks
SecondaryPart 2: Determine responder rates of subjects treated with bezuclastinib at the selected dose versus placebo24 weeksProportion of subjects with at least a 30% reduction of the total symptom score (TSS) on the MS2D2. Proportion of subjects with at least a 50% reduction of the total symptom score (TSS) on the MS2D2.
SecondaryPart 2: Proportion of subjects who had at least 50% reduction in mast cell burden24 weeks
SecondaryParts 1 & 2: Safety and tolerability of bezuclastinib as assessed by number of adverse eventsUp to 24 weeksCTCAE v5
SecondaryParts 1, 2, & 3: Change and percent change in patient reported outcome (PRO) measuresUp to 5 years
SecondaryParts 1 & 3: Change and percent change in serum tryptaseUp to 12 months
SecondaryParts 1 & 3: Change and percent change in bone marrow mast cellsUp to 18 months
SecondaryPart 1: Assess the pharmacokinetics (PK) of bezuclastinib in subjects with NonAdvSM3 monthsPlasma concentrations of CGT9846
SecondaryPart 2: Determine mean change from baseline in predetermined PRO sub-domain and individual item scores24 weeks
SecondaryParts 2 & 3: Determine change of the lead (most severe) symptom and lead (most severe) subdomain of the MS2D2 in subjects treated with bezuclastinib versus placeboUp to 5 years
Change and percent change from baseline in the symptom score of the subject's most severe symptom. Change and percent change from baseline in the MS2D2 subdomain score of the subject's most severe subdomain.
SecondaryPart 3: Change and percent change in the levels of KIT D816V mutation allele burdenUp to 12 months
SecondaryPart 3: To determine the efficacy of bezuclastinib at the selected doseUp to 2 years
Proportion of subjects with at least a 50% reduction in MS2D2 TSS from baseline at 1 year and 2 years from start of bezuclastinib Change and percent change from baseline in the MS2D2 TSS, subdomain, and individual item scores
SecondaryPart 3: Usage of concomitant medications as rescue therapy for NonAdvSM and changes from baseline in rescue therapy and best supportive care medications regimenUp to 5 years
OtherSubstudy: Efficacy of bezuclastinib at selected dose in subjects whose symptoms are not adequately controlled by avapritinibUp to 2 yearsMean absolute change on the Mastocytosis Symptom Severity Daily Diary (MS2D2)

Source ClinicalTrials.govtrials-2026-11-12-0.5.0

Sources 3

  • ClinicalTrials.gov's posted results, through CTTI's AACTFreely available. Acknowledgement requested
  • ClinicalTrials.govNo license stated
  • NIH RePORTER's clinical studies and project filesPublic domain
Each source's terms
  • ClinicalTrials.gov's posted results, through CTTI's AACTClinicalTrials.gov data via Aggregate Analysis of ClinicalTrials.gov (AACT), CTTI. CTTI makes its materials freely available and requests acknowledgement. https://aact.ctti-clinicaltrials.org/documentation/299
  • ClinicalTrials.govnone stated
  • NIH RePORTER's clinical studies and project filesPublic domain (NIH RePORTER)

ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.

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