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NCT03164616 · OUTCOME

Objective Response Rate (ORR)

Study of Durvalumab + Tremelimumab With Chemotherapy or Durvalumab With Chemotherapy or Chemotherapy Alone for Patients With Lung Cancer (POSEIDON). · Source last updated 2026-03-13

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

Measure
NUMBER
Unit
percentage of patients
Interval / dispersion
Not reported
Time frame
Tumor scans performed at baseline, Week 6, Week 12 and then every 8 weeks relative to date of randomization until radiological progression. Assessed until global cohort DCO of 24 July 2019 (maximum of approximately 25 months).

What was measured

ORR (per RECIST 1.1 using BICR assessments) was defined as the percentage of patients with at least one visit response of complete response (CR) or partial response (PR). Results are presented for the pre-specified ORR analysis using unconfirmed responses based on BICR.

Analysis population: Global cohort: The FAS included all randomized patients. The denominator was a subset of the FAS who had measurable disease at baseline.

Groups in this outcome

T + D + SoC

During chemotherapy (combination) stage: Patients received tremelimumab 75 mg + durvalumab 1500 mg combination therapy + SoC chemotherapy via IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). The SoC chemotherapy was the Investigator's choice of one of the following regimens: abraxane + carboplatin (squamous and non-squamous patients), pemetrexed + cisplatin or carboplatin (non-squamous patients only), or gemcitabine + cisplatin or carboplatin (squamous patients only). Post-chemotherapy (maintenance) stage: Patients then continued to receive durvalumab monotherapy 1500 mg IV infusion Q4W from Week 12 until PD, unless there was unacceptable toxicity, withdrawal of consent, or another discontinuation criterion was met. Patients also received an additional dose of tremelimumab 75 mg (in combination with durvalumab) at Week 16 post-chemotherapy. Non-squamous patients who received pemetrexed + carboplatin/cisplatin during chemotherapy stage could receive pemetrexed maintenance therapy, given Q4W from Week 12 until PD, unless contraindicated per the Investigator.

D + SoC

During chemotherapy (combination) stage: Patients received durvalumab 1500 mg monotherapy + SoC chemotherapy via IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). The SoC chemotherapy was the Investigator's choice of one of the following regimens: abraxane + carboplatin (squamous and non-squamous patients), pemetrexed + cisplatin or carboplatin (non-squamous patients only), or gemcitabine + cisplatin or carboplatin (squamous patients only). Post-chemotherapy (maintenance) stage: Patients then continued to receive durvalumab monotherapy 1500 mg IV infusion Q4W from Week 12 until PD, unless there was unacceptable toxicity, withdrawal of consent, or another discontinuation criterion was met. Non-squamous patients who received pemetrexed + carboplatin/cisplatin during chemotherapy stage could receive pemetrexed maintenance therapy, given Q4W from Week 12 until PD, unless contraindicated per the Investigator.

SoC Alone

During chemotherapy (combination) stage: Patients received SoC chemotherapy alone via IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). Patients could also receive SoC chemotherapy for an additional 2 cycles Q3W on Weeks 12 and 15 if clinically indicated and at the Investigator's discretion before the patient entered follow-up. The SoC chemotherapy was the Investigator's choice of one of the following regimens: abraxane + carboplatin (squamous and non-squamous patients), pemetrexed + cisplatin or carboplatin (non-squamous patients only), or gemcitabine + cisplatin or carboplatin (squamous patients only). Post-chemotherapy (maintenance) stage: Non-squamous patients who received pemetrexed + carboplatin/cisplatin during chemotherapy stage could receive pemetrexed maintenance therapy, given Q3W or Q4W (dependent on Investigator decision and local standards) from Week 12 until PD, unless contraindicated per the Investigator.

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

Analysis denominator · Participants

GroupSource count
T + D + SoC335
D + SoC330
SoC Alone332

Reported measurements

Source class 1
Values in percentage of patients · Interval/dispersion: Not reported
GroupValueSpreadLowerUpperComment
T + D + SoC46.3Not reportedNot reportedNot reportedNot reported
D + SoC48.5Not reportedNot reportedNot reportedNot reported
SoC Alone33.4Not reportedNot reportedNot reportedNot reported

Source statistical analyses

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

  1. ci Lower Limit
    1.382
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.619
    group Description
    D + SoC vs SoC alone. An odds ratio \>1 favors D + SoC compared to SoC alone. Analysis was performed using logistic regression adjusting for PD-L1 tumor expression (TC ≥50% vs \<50%), histology (squamous vs non-squamous) and disease stage (IVA vs IVB), with the CI calculated using a profile likelihood approach.
    group Ids
    1. OG001
    2. OG002
    non Inferiority Type
    SUPERIORITY
    param Type
    Odds Ratio (OR)
    param Value
    1.90
  2. ci Lower Limit
    1.260
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.367
    group Description
    T + D + SoC vs SoC alone. An odds ratio \>1 favors T + D + SoC compared to SoC alone. Analysis was performed using logistic regression adjusting for PD-L1 tumor expression (TC ≥50% vs TC \<50%), histology (squamous vs non-squamous) and disease stage (IVA vs IVB), with the CI calculated using a profile likelihood approach.
    group Ids
    1. OG000
    2. OG002
    non Inferiority Type
    SUPERIORITY
    param Type
    Odds Ratio (OR)
    param Value
    1.72
Complete source fields
analyses
  1. ci Lower Limit
    1.382
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.619
    group Description
    D + SoC vs SoC alone. An odds ratio \>1 favors D + SoC compared to SoC alone. Analysis was performed using logistic regression adjusting for PD-L1 tumor expression (TC ≥50% vs \<50%), histology (squamous vs non-squamous) and disease stage (IVA vs IVB), with the CI calculated using a profile likelihood approach.
    group Ids
    1. OG001
    2. OG002
    non Inferiority Type
    SUPERIORITY
    param Type
    Odds Ratio (OR)
    param Value
    1.90
  2. ci Lower Limit
    1.260
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    2.367
    group Description
    T + D + SoC vs SoC alone. An odds ratio \>1 favors T + D + SoC compared to SoC alone. Analysis was performed using logistic regression adjusting for PD-L1 tumor expression (TC ≥50% vs TC \<50%), histology (squamous vs non-squamous) and disease stage (IVA vs IVB), with the CI calculated using a profile likelihood approach.
    group Ids
    1. OG000
    2. OG002
    non Inferiority Type
    SUPERIORITY
    param Type
    Odds Ratio (OR)
    param Value
    1.72
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        value
        46.3
      2. group Id
        OG001
        value
        48.5
      3. group Id
        OG002
        value
        33.4
denoms
  1. counts
    1. group Id
      OG000
      value
      335
    2. group Id
      OG001
      value
      330
    3. group Id
      OG002
      value
      332
    units
    Participants
description
ORR (per RECIST 1.1 using BICR assessments) was defined as the percentage of patients with at least one visit response of complete response (CR) or partial response (PR). Results are presented for the pre-specified ORR analysis using unconfirmed responses based on BICR.
groups
  1. description
    During chemotherapy (combination) stage: Patients received tremelimumab 75 mg + durvalumab 1500 mg combination therapy + SoC chemotherapy via IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). The SoC chemotherapy was the Investigator's choice of one of the following regimens: abraxane + carboplatin (squamous and non-squamous patients), pemetrexed + cisplatin or carboplatin (non-squamous patients only), or gemcitabine + cisplatin or carboplatin (squamous patients only). Post-chemotherapy (maintenance) stage: Patients then continued to receive durvalumab monotherapy 1500 mg IV infusion Q4W from Week 12 until PD, unless there was unacceptable toxicity, withdrawal of consent, or another discontinuation criterion was met. Patients also received an additional dose of tremelimumab 75 mg (in combination with durvalumab) at Week 16 post-chemotherapy. Non-squamous patients who received pemetrexed + carboplatin/cisplatin during chemotherapy stage could receive pemetrexed maintenance therapy, given Q4W from Week 12 until PD, unless contraindicated per the Investigator.
    id
    OG000
    title
    T + D + SoC
  2. description
    During chemotherapy (combination) stage: Patients received durvalumab 1500 mg monotherapy + SoC chemotherapy via IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). The SoC chemotherapy was the Investigator's choice of one of the following regimens: abraxane + carboplatin (squamous and non-squamous patients), pemetrexed + cisplatin or carboplatin (non-squamous patients only), or gemcitabine + cisplatin or carboplatin (squamous patients only). Post-chemotherapy (maintenance) stage: Patients then continued to receive durvalumab monotherapy 1500 mg IV infusion Q4W from Week 12 until PD, unless there was unacceptable toxicity, withdrawal of consent, or another discontinuation criterion was met. Non-squamous patients who received pemetrexed + carboplatin/cisplatin during chemotherapy stage could receive pemetrexed maintenance therapy, given Q4W from Week 12 until PD, unless contraindicated per the Investigator.
    id
    OG001
    title
    D + SoC
  3. description
    During chemotherapy (combination) stage: Patients received SoC chemotherapy alone via IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). Patients could also receive SoC chemotherapy for an additional 2 cycles Q3W on Weeks 12 and 15 if clinically indicated and at the Investigator's discretion before the patient entered follow-up. The SoC chemotherapy was the Investigator's choice of one of the following regimens: abraxane + carboplatin (squamous and non-squamous patients), pemetrexed + cisplatin or carboplatin (non-squamous patients only), or gemcitabine + cisplatin or carboplatin (squamous patients only). Post-chemotherapy (maintenance) stage: Non-squamous patients who received pemetrexed + carboplatin/cisplatin during chemotherapy stage could receive pemetrexed maintenance therapy, given Q3W or Q4W (dependent on Investigator decision and local standards) from Week 12 until PD, unless contraindicated per the Investigator.
    id
    OG002
    title
    SoC Alone
param Type
NUMBER
population Description
Global cohort: The FAS included all randomized patients. The denominator was a subset of the FAS who had measurable disease at baseline.
reporting Status
POSTED
time Frame
Tumor scans performed at baseline, Week 6, Week 12 and then every 8 weeks relative to date of randomization until radiological progression. Assessed until global cohort DCO of 24 July 2019 (maximum of approximately 25 months).
title
Objective Response Rate (ORR)
type
SECONDARY
unit Of Measure
percentage of patients

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Preserved source evidence · Not medical advice