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NCT03037385 · OUTCOME

Phase 2: CBR

Phase 1/2 Study of the Highly-selective RET Inhibitor, Pralsetinib (BLU-667), in Participants With Thyroid Cancer, Non-Small Cell Lung Cancer, and Other Advanced Solid Tumors · Source last updated 2025-05-31

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

Measure
NUMBER
Unit
percentage of participants
Interval / dispersion
95% Confidence Interval
Time frame
Up to approximately 79.8 months

What was measured

CBR was defined as the percentage of participants with CR or PR, or SD which has been lasting at least 16 weeks (i.e. 4 cycles if 28 days are in one cycle) from the first dose date. CR was defined as the disappearance of all target lesions or any pathological lymph nodes (whether target or non-target) having a reduction in the short axis to \<10 mm. PR was defined as at least a 30% decrease in the SOD of all target lesions, taking as reference the baseline SOD, in the absence of CR. SD was defined as neither sufficient shrinkage to qualify for CR or PR nor sufficient increase to qualify for PD. PD was defined as at least a 20% increase in SOD of target lesions, taking as reference the smallest SOD on study (including baseline). CBR and its two-sided 95% CI, which is based on the exact binomial distribution (Clopper-Pearson), were presented.

Analysis population: RET-altered measurable disease population included participants in the efficacy population who have measurable (target) disease per RECIST v1.1, at baseline according to BICR and sufficient evidence of a RET alteration. As prespecified in the SAP, Phase 1 participants treated at 400 mg QD are pooled with Phase 2 participants for efficacy analysis.

Groups in this outcome

RET- Fusion Positive NSCLC With Prior Platinum Treatment

Participants who had RET-fusion positive NSCLC previously treated with platinum-based chemotherapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-fusion Positive NSCLC With Non-platinum Systemic Treatment

Participants who had RET-fusion positive NSCLC previously treated with non-platinum or systemic therapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-fusion Positive NSCLC With No Prior Systemic or Platinum Treatment

Participants who had RET-fusion positive NSCLC not previously treated with systemic or platinum-based chemotherapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-mutation MTC With Prior Cabozantinib and/or Vandetanib Treatment

Participants who had RET- mutation positive MTC previously treated with either cabozantinib and/or vandetanib therapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-mutation MTC With No Prior Cabozantinib or Vandetanib Treatment

Participants who had RET- mutation positive MTC not previously treated with cabozantinib or vandetanib therapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-fusion Positive TC

Participants who had RET-fusion positive TC received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-fusion Positive Solid Tumors Other Than NSCLC and TC

Participants who had other RET-positive solid tumors other than NSCLC and TC received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-altered Solid Tumors Previously Treated With RET Inhibitor

Participants who had RET-altered (fusion or mutation) solid tumors previously treated with a selective RET TKI received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

RET-mutation Positive Tumors Other Than MTC

Participants who had RET-mutation positive solid tumors received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.

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

Analysis denominator · Participants

GroupSource count
RET- Fusion Positive NSCLC With Prior Platinum Treatment130
RET-fusion Positive NSCLC With Non-platinum Systemic Treatment23
RET-fusion Positive NSCLC With No Prior Systemic or Platinum Treatment106
RET-mutation MTC With Prior Cabozantinib and/or Vandetanib Treatment60
RET-mutation MTC With No Prior Cabozantinib or Vandetanib Treatment72
RET-fusion Positive TC27
RET-fusion Positive Solid Tumors Other Than NSCLC and TC28
RET-altered Solid Tumors Previously Treated With RET Inhibitor21
RET-mutation Positive Tumors Other Than MTC13

Reported measurements

Source class 1
Values in percentage of participants · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
RET- Fusion Positive NSCLC With Prior Platinum Treatment74.6Not reported66.281.8Not reported
RET-fusion Positive NSCLC With Non-platinum Systemic Treatment78.3Not reported56.392.5Not reported
RET-fusion Positive NSCLC With No Prior Systemic or Platinum Treatment80.2Not reported71.387.3Not reported
RET-mutation MTC With Prior Cabozantinib and/or Vandetanib Treatment80.0Not reported67.789.2Not reported
RET-mutation MTC With No Prior Cabozantinib or Vandetanib Treatment90.3Not reported81.096.0Not reported
RET-fusion Positive TC85.2Not reported66.395.8Not reported
RET-fusion Positive Solid Tumors Other Than NSCLC and TC60.7Not reported40.678.5Not reported
RET-altered Solid Tumors Previously Treated With RET Inhibitor28.6Not reported11.352.2Not reported
RET-mutation Positive Tumors Other Than MTC23.1Not reported5.053.8Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        66.2
        upper Limit
        81.8
        value
        74.6
      2. group Id
        OG001
        lower Limit
        56.3
        upper Limit
        92.5
        value
        78.3
      3. group Id
        OG002
        lower Limit
        71.3
        upper Limit
        87.3
        value
        80.2
      4. group Id
        OG003
        lower Limit
        67.7
        upper Limit
        89.2
        value
        80.0
      5. group Id
        OG004
        lower Limit
        81.0
        upper Limit
        96.0
        value
        90.3
      6. group Id
        OG005
        lower Limit
        66.3
        upper Limit
        95.8
        value
        85.2
      7. group Id
        OG006
        lower Limit
        40.6
        upper Limit
        78.5
        value
        60.7
      8. group Id
        OG007
        lower Limit
        11.3
        upper Limit
        52.2
        value
        28.6
      9. group Id
        OG008
        lower Limit
        5.0
        upper Limit
        53.8
        value
        23.1
denoms
  1. counts
    1. group Id
      OG000
      value
      130
    2. group Id
      OG001
      value
      23
    3. group Id
      OG002
      value
      106
    4. group Id
      OG003
      value
      60
    5. group Id
      OG004
      value
      72
    6. group Id
      OG005
      value
      27
    7. group Id
      OG006
      value
      28
    8. group Id
      OG007
      value
      21
    9. group Id
      OG008
      value
      13
    units
    Participants
description
CBR was defined as the percentage of participants with CR or PR, or SD which has been lasting at least 16 weeks (i.e. 4 cycles if 28 days are in one cycle) from the first dose date. CR was defined as the disappearance of all target lesions or any pathological lymph nodes (whether target or non-target) having a reduction in the short axis to \<10 mm. PR was defined as at least a 30% decrease in the SOD of all target lesions, taking as reference the baseline SOD, in the absence of CR. SD was defined as neither sufficient shrinkage to qualify for CR or PR nor sufficient increase to qualify for PD. PD was defined as at least a 20% increase in SOD of target lesions, taking as reference the smallest SOD on study (including baseline). CBR and its two-sided 95% CI, which is based on the exact binomial distribution (Clopper-Pearson), were presented.
dispersion Type
95% Confidence Interval
groups
  1. description
    Participants who had RET-fusion positive NSCLC previously treated with platinum-based chemotherapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG000
    title
    RET- Fusion Positive NSCLC With Prior Platinum Treatment
  2. description
    Participants who had RET-fusion positive NSCLC previously treated with non-platinum or systemic therapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG001
    title
    RET-fusion Positive NSCLC With Non-platinum Systemic Treatment
  3. description
    Participants who had RET-fusion positive NSCLC not previously treated with systemic or platinum-based chemotherapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG002
    title
    RET-fusion Positive NSCLC With No Prior Systemic or Platinum Treatment
  4. description
    Participants who had RET- mutation positive MTC previously treated with either cabozantinib and/or vandetanib therapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG003
    title
    RET-mutation MTC With Prior Cabozantinib and/or Vandetanib Treatment
  5. description
    Participants who had RET- mutation positive MTC not previously treated with cabozantinib or vandetanib therapies received pralsetinib, 400 mg orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG004
    title
    RET-mutation MTC With No Prior Cabozantinib or Vandetanib Treatment
  6. description
    Participants who had RET-fusion positive TC received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG005
    title
    RET-fusion Positive TC
  7. description
    Participants who had other RET-positive solid tumors other than NSCLC and TC received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG006
    title
    RET-fusion Positive Solid Tumors Other Than NSCLC and TC
  8. description
    Participants who had RET-altered (fusion or mutation) solid tumors previously treated with a selective RET TKI received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG007
    title
    RET-altered Solid Tumors Previously Treated With RET Inhibitor
  9. description
    Participants who had RET-mutation positive solid tumors received pralsetinib, 400 mg, orally, QD until discontinuation due to toxicity, disease progression, or other reasons.
    id
    OG008
    title
    RET-mutation Positive Tumors Other Than MTC
param Type
NUMBER
population Description
RET-altered measurable disease population included participants in the efficacy population who have measurable (target) disease per RECIST v1.1, at baseline according to BICR and sufficient evidence of a RET alteration. As prespecified in the SAP, Phase 1 participants treated at 400 mg QD are pooled with Phase 2 participants for efficacy analysis.
reporting Status
POSTED
time Frame
Up to approximately 79.8 months
title
Phase 2: CBR
type
SECONDARY
unit Of Measure
percentage of participants

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Preserved source evidence · Not medical advice