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NCT03041311 · OUTCOME

Overall Survival (OS)

Carboplatin, Etoposide, and Atezolizumab With or Without Trilaciclib (G1T28), a CDK4/6 Inhibitor, in Extensive-Stage SCLC · Source last updated 2025-09-25

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

Measure
NUMBER
Unit
Months
Interval / dispersion
95% Confidence Interval
Time frame
From date of randomization to date of death due to any cause, assessed up to a maximum of 38.1 months.

What was measured

Overall survival was calculated as the time (months) from date of randomization to the date of death due to any cause. Patients who did not die during the study were censored at the date last known to be alive. Patients lacking data beyond the date of randomization had their survival time censored at date of randomization. Overall survival was not censored if a patient received other anti-tumor treatments after the study drugs. Overall survival was calculated using the Kaplan-Meier method.

Analysis population: Intent-to-treat (ITT Analysis Set)

Groups in this outcome

Trilaciclib+Etoposide/Carboplatin/Atezolizumab

Induction: Patients received trilaciclib 240 mg/m² administered IV once daily prior to E/P/A on Days 1, 2 and 3 of each 21-day E/P/A therapy cycle (up to 4 cycles in total). Etoposide 100 mg/m² was administered IV daily on Days 1, 2, and 3 of each 21-day cycle. Carboplatin was administered on Day 1 of each 21-day cycle using the Calvert formula with a target AUC = 5 mg/mL/min to calculate the dose. Atezolizumab 1200 mg was administered as an IV infusion on Day 1 of each 21-day cycle. Maintenance: Following the induction phase, patients received maintenance atezolizumab at a dose of 1200 mg on Day 1 of every 21-day cycle until disease progression, unacceptable toxicity or discontinuation by the patient or investigator.

Placebo+Etoposide/Carboplatin/Atezolizumab

Induction: Patients received placebo administered IV once daily prior to E/P/A on Days 1, 2 and 3 of each 21-day E/P/A therapy cycle (up to 4 cycles in total). Etoposide 100 mg/m² was administered IV daily on Days 1, 2, and 3 of each 21-day cycle. Carboplatin was administered on Day 1 of each 21-day cycle using the Calvert formula with a target AUC = 5 mg/mL/min to calculate the dose. Atezolizumab 1200 mg was administered as an IV infusion on Day 1 of each 21-day cycle. Maintenance: Following the induction phase, patients received maintenance atezolizumab at a dose of 1200 mg on Day 1 of every 21-day cycle until disease progression, unacceptable toxicity or discontinuation by the patient or 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
Trilaciclib+Etoposide/Carboplatin/Atezolizumab54
Placebo+Etoposide/Carboplatin/Atezolizumab53

Reported measurements

25%
Values in Months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Trilaciclib+Etoposide/Carboplatin/Atezolizumab7.2Not reported4.910.2Not reported
Placebo+Etoposide/Carboplatin/Atezolizumab6.7Not reported3.68.1Not reported
Median
Values in Months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Trilaciclib+Etoposide/Carboplatin/Atezolizumab12.0Not reported9.616.2Not reported
Placebo+Etoposide/Carboplatin/Atezolizumab12.8Not reported7.915.5Not reported
75%
Values in Months · Interval/dispersion: 95% Confidence Interval
GroupValueSpreadLowerUpperComment
Trilaciclib+Etoposide/Carboplatin/Atezolizumab20.6Not reported14.523.2Not reported
Placebo+Etoposide/Carboplatin/Atezolizumab22.4Not reported15.530.0Not reported

Source statistical analyses

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

  1. ci Lower Limit
    0.64
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.52
    dispersion Type
    STANDARD_ERROR_OF_MEAN
    dispersion Value
    0.218
    estimate Comment
    The HR and its 95% CI were calculated using the Cox proportional hazard regression model with treatment and stratification factors of ECOG performance status (0 to 1 versus 2) and presence of brain metastases (Yes versus No).
    group Ids
    1. OG000
    2. OG001
    non Inferiority Comment
    For time-to-event variable, the Kaplan-Meier method was used to estimate its within group median value, 25% and 75% percentile values.
    non Inferiority Type
    SUPERIORITY
    p Value
    0.9942
    p Value Comment
    The 2-sided p-value was obtained from the stratified log-rank test to account for the stratification factors.
    param Type
    Hazard Ratio (HR)
    param Value
    0.99
    statistical Comment
    stratified log-rank test
    statistical Method
    Log Rank
Complete source fields
analyses
  1. ci Lower Limit
    0.64
    ci Num Sides
    TWO_SIDED
    ci Pct Value
    95
    ci Upper Limit
    1.52
    dispersion Type
    STANDARD_ERROR_OF_MEAN
    dispersion Value
    0.218
    estimate Comment
    The HR and its 95% CI were calculated using the Cox proportional hazard regression model with treatment and stratification factors of ECOG performance status (0 to 1 versus 2) and presence of brain metastases (Yes versus No).
    group Ids
    1. OG000
    2. OG001
    non Inferiority Comment
    For time-to-event variable, the Kaplan-Meier method was used to estimate its within group median value, 25% and 75% percentile values.
    non Inferiority Type
    SUPERIORITY
    p Value
    0.9942
    p Value Comment
    The 2-sided p-value was obtained from the stratified log-rank test to account for the stratification factors.
    param Type
    Hazard Ratio (HR)
    param Value
    0.99
    statistical Comment
    stratified log-rank test
    statistical Method
    Log Rank
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        4.9
        upper Limit
        10.2
        value
        7.2
      2. group Id
        OG001
        lower Limit
        3.6
        upper Limit
        8.1
        value
        6.7
    title
    25%
  2. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        9.6
        upper Limit
        16.2
        value
        12.0
      2. group Id
        OG001
        lower Limit
        7.9
        upper Limit
        15.5
        value
        12.8
    title
    Median
  3. categories
    1. measurements
      1. group Id
        OG000
        lower Limit
        14.5
        upper Limit
        23.2
        value
        20.6
      2. group Id
        OG001
        lower Limit
        15.5
        upper Limit
        30.0
        value
        22.4
    title
    75%
denoms
  1. counts
    1. group Id
      OG000
      value
      54
    2. group Id
      OG001
      value
      53
    units
    Participants
description
Overall survival was calculated as the time (months) from date of randomization to the date of death due to any cause. Patients who did not die during the study were censored at the date last known to be alive. Patients lacking data beyond the date of randomization had their survival time censored at date of randomization. Overall survival was not censored if a patient received other anti-tumor treatments after the study drugs. Overall survival was calculated using the Kaplan-Meier method.
dispersion Type
95% Confidence Interval
groups
  1. description
    Induction: Patients received trilaciclib 240 mg/m² administered IV once daily prior to E/P/A on Days 1, 2 and 3 of each 21-day E/P/A therapy cycle (up to 4 cycles in total). Etoposide 100 mg/m² was administered IV daily on Days 1, 2, and 3 of each 21-day cycle. Carboplatin was administered on Day 1 of each 21-day cycle using the Calvert formula with a target AUC = 5 mg/mL/min to calculate the dose. Atezolizumab 1200 mg was administered as an IV infusion on Day 1 of each 21-day cycle. Maintenance: Following the induction phase, patients received maintenance atezolizumab at a dose of 1200 mg on Day 1 of every 21-day cycle until disease progression, unacceptable toxicity or discontinuation by the patient or investigator.
    id
    OG000
    title
    Trilaciclib+Etoposide/Carboplatin/Atezolizumab
  2. description
    Induction: Patients received placebo administered IV once daily prior to E/P/A on Days 1, 2 and 3 of each 21-day E/P/A therapy cycle (up to 4 cycles in total). Etoposide 100 mg/m² was administered IV daily on Days 1, 2, and 3 of each 21-day cycle. Carboplatin was administered on Day 1 of each 21-day cycle using the Calvert formula with a target AUC = 5 mg/mL/min to calculate the dose. Atezolizumab 1200 mg was administered as an IV infusion on Day 1 of each 21-day cycle. Maintenance: Following the induction phase, patients received maintenance atezolizumab at a dose of 1200 mg on Day 1 of every 21-day cycle until disease progression, unacceptable toxicity or discontinuation by the patient or investigator.
    id
    OG001
    title
    Placebo+Etoposide/Carboplatin/Atezolizumab
param Type
NUMBER
population Description
Intent-to-treat (ITT Analysis Set)
reporting Status
POSTED
time Frame
From date of randomization to date of death due to any cause, assessed up to a maximum of 38.1 months.
title
Overall Survival (OS)
type
SECONDARY
unit Of Measure
Months

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