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NCT03043872 · OUTCOME

PK of Tremelimumab; Peak and Trough Serum Concentrations in the China Cohort

Durvalumab ± Tremelimumab in Combination With Platinum Based Chemotherapy in Untreated Extensive-Stage Small Cell Lung Cancer (CASPIAN) · Source last updated 2026-07-16

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

Measure
GEOMETRIC_MEAN
Unit
μg/mL
Interval / dispersion
Geometric Coefficient of Variation
Time frame
Samples were collected post-dose on Day 1 (Week 0), and pre-dose on Weeks 3 and 12. Assessed at the China cohort second analysis DCO (02 November 2020).

What was measured

To evaluate PK, blood samples were collected at pre-specified timepoints and peak and trough serum concentrations of tremelimumab were determined. Peak concentration on Week 0 is the post-infusion concentration of Week 0 (collected within 10 minutes of the end of infusion). Trough concentrations on Weeks 3 and 12 are the pre-infusion concentrations of Weeks 3 and 12, respectively.

Analysis population: The China PK analysis set included all patients in the China cohort who received at least 1 dose of IP, per the protocol for whom any post-dose PK data were available. PK for tremelimumab was performed for the D + T + EP group only.

Groups in this outcome

China Cohort: D + T + EP

During Chemotherapy: Patients received durvalumab (D) 1500 mg in combination with tremelimumab (T) 75 mg IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). For chemotherapy (EP), patients received etoposide (80-100 mg/m\^2) with either carboplatin (area under the curve 5-6) or cisplatin (75-80 mg/m\^2) IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). Post-Chemotherapy: Patients then continued to receive durvalumab 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 IV infusion post-chemotherapy (in combination with durvalumab) at Week 16 if they completed all 4 doses of durvalumab + tremelimumab during chemotherapy.

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

Analysis denominator · Participants

GroupSource count
China Cohort: D + T + EP64

Reported measurements

Week 0: peak concentration

Analysis denominator · Participants

GroupSource count
China Cohort: D + T + EP64
Values in μg/mL · Interval/dispersion: Geometric Coefficient of Variation
GroupValueSpreadLowerUpperComment
China Cohort: D + T + EP24.3427.05Not reportedNot reportedNot reported
Week 3: trough concentration

Analysis denominator · Participants

GroupSource count
China Cohort: D + T + EP61
Values in μg/mL · Interval/dispersion: Geometric Coefficient of Variation
GroupValueSpreadLowerUpperComment
China Cohort: D + T + EP4.53060.60Not reportedNot reportedNot reported
Week 12: trough concentration

Analysis denominator · Participants

GroupSource count
China Cohort: D + T + EP45
Values in μg/mL · Interval/dispersion: Geometric Coefficient of Variation
GroupValueSpreadLowerUpperComment
China Cohort: D + T + EP9.52343.94Not reportedNot reportedNot reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        spread
        27.05
        value
        24.34
    denoms
    1. counts
      1. group Id
        OG000
        value
        64
      units
      Participants
    title
    Week 0: peak concentration
  2. categories
    1. measurements
      1. group Id
        OG000
        spread
        60.60
        value
        4.530
    denoms
    1. counts
      1. group Id
        OG000
        value
        61
      units
      Participants
    title
    Week 3: trough concentration
  3. categories
    1. measurements
      1. group Id
        OG000
        spread
        43.94
        value
        9.523
    denoms
    1. counts
      1. group Id
        OG000
        value
        45
      units
      Participants
    title
    Week 12: trough concentration
denoms
  1. counts
    1. group Id
      OG000
      value
      64
    units
    Participants
description
To evaluate PK, blood samples were collected at pre-specified timepoints and peak and trough serum concentrations of tremelimumab were determined. Peak concentration on Week 0 is the post-infusion concentration of Week 0 (collected within 10 minutes of the end of infusion). Trough concentrations on Weeks 3 and 12 are the pre-infusion concentrations of Weeks 3 and 12, respectively.
dispersion Type
Geometric Coefficient of Variation
groups
  1. description
    During Chemotherapy: Patients received durvalumab (D) 1500 mg in combination with tremelimumab (T) 75 mg IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). For chemotherapy (EP), patients received etoposide (80-100 mg/m\^2) with either carboplatin (area under the curve 5-6) or cisplatin (75-80 mg/m\^2) IV infusion Q3W for 4 doses/cycles (Weeks 0, 3, 6 and 9). Post-Chemotherapy: Patients then continued to receive durvalumab 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 IV infusion post-chemotherapy (in combination with durvalumab) at Week 16 if they completed all 4 doses of durvalumab + tremelimumab during chemotherapy.
    id
    OG000
    title
    China Cohort: D + T + EP
param Type
GEOMETRIC_MEAN
population Description
The China PK analysis set included all patients in the China cohort who received at least 1 dose of IP, per the protocol for whom any post-dose PK data were available. PK for tremelimumab was performed for the D + T + EP group only.
reporting Status
POSTED
time Frame
Samples were collected post-dose on Day 1 (Week 0), and pre-dose on Weeks 3 and 12. Assessed at the China cohort second analysis DCO (02 November 2020).
title
PK of Tremelimumab; Peak and Trough Serum Concentrations in the China Cohort
type
SECONDARY
unit Of Measure
μg/mL

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