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NCT03037385 · OUTCOME

Phase 2: Overall Response Rate (ORR)

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

ORR was defined as the percentage of participants with a confirmed complete response (CR) or partial response (PR) for at least two assessments with at least 28 days apart and no disease progression (PD) in between. Per Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST v1.1), 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 millimeters (mm). PR was defined as at least a 30% decrease in the sum of diameters (SOD) of all target lesions, taking as reference the baseline SOD, in the absence of CR. PD was defined as at least a 20% increase in SOD of target lesions, taking as reference the smallest SOD on study (including baseline). ORR and its two-sided 95% CI, based on the exact binomial distribution (Clopper-Pearson), were presented.

Analysis population: RET-altered measurable disease population included participants in the efficacy population who had measurable (target) disease per RECIST v1.1 at baseline according to blinded central review (BICR) and sufficient evidence of a RET alteration. As prespecified in the SAP, Phase 1 participants treated at 400 mg QD are also included in Phase 2 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 tyrosine kinase inhibitor (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 Treatment:130
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 Treatment:63.1Not reported54.271.4Not reported
RET-fusion Positive NSCLC With Non-platinum Systemic Treatment73.9Not reported51.689.8Not reported
RET-fusion Positive NSCLC With No Prior Systemic or Platinum Treatment78.3Not reported69.285.7Not reported
RET-mutation MTC With Prior Cabozantinib and/or Vandetanib Treatment56.7Not reported43.269.4Not reported
RET-mutation MTC With No Prior Cabozantinib or Vandetanib Treatment77.8Not reported66.486.7Not reported
RET-fusion Positive TC85.2Not reported66.395.8Not reported
RET-fusion Positive Solid Tumors Other Than NSCLC and TC46.4Not reported27.566.1Not reported
RET-altered Solid Tumors Previously Treated With RET Inhibitor19.0Not reported5.441.9Not reported
RET-mutation Positive Tumors Other Than MTC7.7Not reported0.9936.0Not reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        54.2
        upper Limit
        71.4
        value
        63.1
      2. group Id
        OG001
        lower Limit
        51.6
        upper Limit
        89.8
        value
        73.9
      3. group Id
        OG002
        lower Limit
        69.2
        upper Limit
        85.7
        value
        78.3
      4. group Id
        OG003
        lower Limit
        43.2
        upper Limit
        69.4
        value
        56.7
      5. group Id
        OG004
        lower Limit
        66.4
        upper Limit
        86.7
        value
        77.8
      6. group Id
        OG005
        lower Limit
        66.3
        upper Limit
        95.8
        value
        85.2
      7. group Id
        OG006
        lower Limit
        27.5
        upper Limit
        66.1
        value
        46.4
      8. group Id
        OG007
        lower Limit
        5.4
        upper Limit
        41.9
        value
        19.0
      9. group Id
        OG008
        lower Limit
        0.99
        upper Limit
        36.0
        value
        7.7
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
ORR was defined as the percentage of participants with a confirmed complete response (CR) or partial response (PR) for at least two assessments with at least 28 days apart and no disease progression (PD) in between. Per Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST v1.1), 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 millimeters (mm). PR was defined as at least a 30% decrease in the sum of diameters (SOD) of all target lesions, taking as reference the baseline SOD, in the absence of CR. PD was defined as at least a 20% increase in SOD of target lesions, taking as reference the smallest SOD on study (including baseline). ORR and its two-sided 95% CI, 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 tyrosine kinase inhibitor (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 had measurable (target) disease per RECIST v1.1 at baseline according to blinded central review (BICR) and sufficient evidence of a RET alteration. As prespecified in the SAP, Phase 1 participants treated at 400 mg QD are also included in Phase 2 efficacy analysis.
reporting Status
POSTED
time Frame
Up to approximately 79.8 months
title
Phase 2: Overall Response Rate (ORR)
type
PRIMARY
unit Of Measure
percentage of participants

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Preserved source evidence · Not medical advice