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NCT03785964 · OUTCOME

Progression Free Survival (PFS) Defined as the Time From Randomization Until Date of Assessment of Progression or Death by Any Cause.

Nirogacestat for Adults With Desmoid Tumor/Aggressive Fibromatosis (DT/AF) · Source last updated 2026-08-20

Results reported by the registry submitting party. Population, time horizon, units and missing values must be read together.

Measure
MEDIAN
Unit
Months
Interval / dispersion
95% Confidence Interval
Time frame
On the first day of every 3 cycles (each cycle is 28 days) until disease progression is observed or death, whichever comes first, assessed up to approximately 2 years

What was measured

Progression will be determined radiographically using RECIST v1.1 (Eisenhauer, 2009) or clinically as assessed by the investigator. Clinical progression is defined as the onset or worsening of symptoms resulting in a global deterioration of health status causing the permanent discontinuation from study treatment and the initiation of emergent treatment (e.g., radiotherapy, surgery, or systemic therapy including chemotherapy or tyrosine kinase inhibitors) for DT/AF. Events of clinical progression will be adjudicated by an independent blinded central Endpoint Adjudication Committee (EAC) which will qualify events of clinical progression for inclusion in the PFS endpoint prior to study unblinding according to an EAC Review Charter.

Analysis population: Intent-to-Treat Population (All Randomized)

Groups in this outcome

Double-Blind Phase - Nirogacestat

Nirogacestat 150 mg by mouth, twice daily Nirogacestat oral tablet: Nirogacestat tablet

Double-Blind Phase - Placebo

Placebo by mouth, twice daily Placebo Oral Tablet: Sugar pill manufactured to mimic nirogacestat 50 mg tablet

Group identifiers and denominators belong to this outcome only. They may differ in another outcome or in safety reporting.

Analysis denominator · Participants

GroupSource count
Double-Blind Phase - Nirogacestat70
Double-Blind Phase - Placebo72

Reported measurements

Source class 1
Values in Months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Double-Blind Phase - NirogacestatNANot reportedNANANot reached. Only less than 50% of the participants had events in Nirogacestat treatment arm.
Double-Blind Phase - Placebo15.1Not reported8.4NAUpper 95% CI is not reached.

Source statistical analyses

Group order, estimate direction, methods and comments are retained. No treatment ranking is inferred.

  1. ci Lower Limit
    0.15
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.55
    group Description
    Hazard ratio was estimated from stratified Cox proportional hazards model using the exact method for ties, stratified by tumor location. Placebo was the reference treatment.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    < 0.001
    param Type
    Hazard Ratio (HR)
    param Value
    0.29
    statistical Comment
    p-value was from a one-sided stratified log-rank test with placebo as reference.
    statistical Method
    Log Rank
Complete source fields
analyses
  1. ci Lower Limit
    0.15
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    0.55
    group Description
    Hazard ratio was estimated from stratified Cox proportional hazards model using the exact method for ties, stratified by tumor location. Placebo was the reference treatment.
    group Ids
    1. OG000
    2. OG001
    non Inferiority Type
    SUPERIORITY
    p Value
    < 0.001
    param Type
    Hazard Ratio (HR)
    param Value
    0.29
    statistical Comment
    p-value was from a one-sided stratified log-rank test with placebo as reference.
    statistical Method
    Log Rank
classes
  1. categories
    1. measurements
      1. comment
        Not reached. Only less than 50% of the participants had events in Nirogacestat treatment arm.
        group Id
        OG000
        lower Limit
        NA
        upper Limit
        NA
        value
        NA
      2. comment
        Upper 95% CI is not reached.
        group Id
        OG001
        lower Limit
        8.4
        upper Limit
        NA
        value
        15.1
denoms
  1. counts
    1. group Id
      OG000
      value
      70
    2. group Id
      OG001
      value
      72
    units
    Participants
description
Progression will be determined radiographically using RECIST v1.1 (Eisenhauer, 2009) or clinically as assessed by the investigator. Clinical progression is defined as the onset or worsening of symptoms resulting in a global deterioration of health status causing the permanent discontinuation from study treatment and the initiation of emergent treatment (e.g., radiotherapy, surgery, or systemic therapy including chemotherapy or tyrosine kinase inhibitors) for DT/AF. Events of clinical progression will be adjudicated by an independent blinded central Endpoint Adjudication Committee (EAC) which will qualify events of clinical progression for inclusion in the PFS endpoint prior to study unblinding according to an EAC Review Charter.
dispersion Type
95% Confidence Interval
groups
  1. description
    Nirogacestat 150 mg by mouth, twice daily Nirogacestat oral tablet: Nirogacestat tablet
    id
    OG000
    title
    Double-Blind Phase - Nirogacestat
  2. description
    Placebo by mouth, twice daily Placebo Oral Tablet: Sugar pill manufactured to mimic nirogacestat 50 mg tablet
    id
    OG001
    title
    Double-Blind Phase - Placebo
param Type
MEDIAN
population Description
Intent-to-Treat Population (All Randomized)
reporting Status
POSTED
time Frame
On the first day of every 3 cycles (each cycle is 28 days) until disease progression is observed or death, whichever comes first, assessed up to approximately 2 years
title
Progression Free Survival (PFS) Defined as the Time From Randomization Until Date of Assessment of Progression or Death by Any Cause.
type
PRIMARY
unit Of Measure
Months

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Preserved source evidence · Not medical advice