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Study of Cisplatin/Vinorelbine +/- Cetuximab as First-line Treatment of Advanced Non Small Cell Lung Cancer (FLEX)

Open, Randomized, Controlled, Multicenter Phase III Study Comparing Cisplatin/Vinorelbine Plus Cetuximab Versus Cisplatin/Vinorelbine as First-line Treatment for Patients With Epidermal Growth Factor Receptor Expressing (EGFR-expressing) Advanced NSCLC.

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT00148798
Acronym
FLEX
Enrollment
1861
Registered
2005-09-08
Start date
2004-10-31
Completion date
2012-05-31
Last updated
2014-06-25

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Non Small Cell Lung Cancer (NSCLC)

Keywords

Cetuximab, Non small cell lung cancer, Lung cancer, Cisplatin/vinorelbine, Monoclonal antibody, Erbitux

Brief summary

The purpose of this trial is to investigate the efficacy of cetuximab in combination with chemotherapy in comparison to chemotherapy alone in patients with advanced non small cell lung cancer who did not received prior chemotherapy. Overall survival will be taken as primary measure of efficacy.

Interventions

DRUGcetuximab + cisplatin + vinorelbine

cetuximab given as an intravenous (i.v.) infusion every week (400mg/m\^2 initial dose and 250mg/m\^2 subsequent doses) until progressive disease (PD) + cisplatin 80mg/m\^2 i.v. infusion on day 1 of each 3-week cycle + vinorelbine 25mg/m\^2 i.v. infusion on days 1 and 8 of each 3-week cycle.

DRUGcisplatin + vinorelbine

cisplatin 80mg/m\^2 i.v. infusion on day 1 of each 3-week cycle + vinorelbine 25mg/m\^2 i.v. infusion on days 1 and 8 of each 3-week cycle.

Sponsors

Merck KGaA, Darmstadt, Germany
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Diagnosis of histologically or cytologically confirmed NSCLC, stage IIIb with documented malignant pleural effusion or stage IV * Immunohistochemical evidence of EGFR expression on tumor tissue * Presence of at least 1 bi-dimensionally measurable index lesion, whereby index lesions must not lie in an irradiated area

Exclusion criteria

* Previous exposure to monoclonal antibodies, signal transduction inhibitors or EGFR-targeting therapy * Previous chemotherapy for NSCLC * Documented or symptomatic brain metastasis * Superior vena cava syndrome contra-indicating hydration * Previous malignancy in the last 5 years except basal cell carcinoma of the skin or pre-invasive carcinoma of the cervix

Design outcomes

Primary

MeasureTime frameDescription
Overall Survival Time (OS)Time from randomisation to death or last day known to be alive, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007Time from randomization to death. Patients without event are censored at the last date known to be alive or at the clinical cut-off date, whatever is earlier.

Secondary

MeasureTime frameDescription
Best Overall Response RateEvaluations were performed every 6 weeks until progression, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007The best overall response rate is defined as the proportion of subjects having achieved confirmed Complete Response + Partial Response as the best overall response according to radiological assessments (based on modified WHO criteria).
Disease Control RateEvaluations were performed every 6 weeks until progression, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007The disease control rate is defined as the proportion of subjects having achieved confirmed Complete Response + Partial Response + Stable Disease as best overall response according to radiological assessments (based on modified WHO criteria).
Quality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health Statusat baseline, at cycle 3, at month 6, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007Mean global health status scores (EORTC QLQ-C30) against time for each treatment group. Scores were derived from mutually exclusive sets of items, with scale scores ranging from 0 to 100 after a linear transformation. Higher scores indicate a better QoL.
Progression-free Survival TimeTime from randomization to disease progression, death or last tumor assessment, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007Duration from randomization until radiological progression (based on modified World Health Organisation (WHO) criteria) or death due to any cause. Only deaths within 60 days of last tumor assessment are considered. Patients without event are censored on the date of last tumor assessment.
A Population Pharmacokinetic (PK) Analysis for Cetuximab in Non-Small Cell Lung Cancer (NSCLC) - Serum Cetuximab ConcentrationsWeek 1, Day 1: baseline and end of infusion; Week 7, Day 43: within 12 h after cetuximab administration.Population PK analysis was conducted using non-linear mixed effects modeling (NONMEM) software, integrating the PK data from this study and the Phase II study EMR 62 202-011.
Safety - Number of Patients Experiencing Any Adverse Eventtime from first dose up to 30 after last dose of study treatment, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007Please refer to Adverse Events section for further details
Quality of Life Assessment (EORTC QLQ-C30) Social Functioningat baseline, at cycle 3, at month 6, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007Mean social functioning scores (EORTC QLQ-C30) against time for each treatment group. Scores were derived from mutually exclusive sets of items, with scale scores ranging from 0 to 100 after a linear transformation. Higher scores indicate a higher level of functioning.

Countries

Argentina, Australia, Austria, Belgium, Brazil, Bulgaria, Chile, Czechia, France, Germany, Hong Kong, Hungary, Ireland, Italy, Mexico, Netherlands, Poland, Russia, Singapore, Slovakia, South Korea, Spain, Sweden, Switzerland, Taiwan, Turkey (Türkiye), Ukraine, United Kingdom

Participant flow

Recruitment details

First/last subject (informed consent): October 2004/January 2006. Clinical data cut-off: 18 July 2007. Last subject completed 16 May 2012. Subjects randomized at 155 centers; Asia/Australia: 21; Europe: 120; South America: 14.

Pre-assignment details

Enrolled: 1,861 after consent to epidermal growth factor receptor (EGFR) assessment; 603 excluded (mainly non-fulfillment of inclusion or exclusion criteria). 1,258 screened for eligibility after consent for study procedures; 143 excluded (mainly non-fulfillment of inclusion or exclusion criteria). 1,125 subjects randomized.

Participants by arm

ArmCount
Cetuximab Plus Chemotherapy
cetuximab given as an intravenous (i.v.) infusion every week (400mg/m\^2 initial dose and 250mg/m\^2 subsequent doses) until progressive disease (PD) + cisplatin 80mg/m\^2 i.v. infusion on day 1 of each 3-week cycle + vinorelbine 25mg/m\^2 i.v. infusion on days 1 and 8 of each 3-week cycle. Safety population: includes all treated subjects.
557
Chemotherapy Alone
cisplatin 80mg/m\^2 i.v. infusion on day 1 of each 3-week cycle + vinorelbine 25mg/m\^2 i.v. infusion on days 1 and 8 of each 3-week cycle. Safety population: includes all treated subjects.
568
Total1,125

Baseline characteristics

CharacteristicCetuximab Plus ChemotherapyChemotherapy AloneTotal
Age, Continuous59 years60 years59 years
Age, Customized
<18 years
0 participants0 participants0 participants
Age, Customized
>=65 years
172 participants179 participants351 participants
Age, Customized
Between 18 and 65 years
385 participants389 participants774 participants
Region of Enrollment
Argentina
5 participants2 participants7 participants
Region of Enrollment
Australia
20 participants23 participants43 participants
Region of Enrollment
Austria
9 participants7 participants16 participants
Region of Enrollment
Belgium
3 participants10 participants13 participants
Region of Enrollment
Brazil
48 participants51 participants99 participants
Region of Enrollment
Bulgaria
12 participants12 participants24 participants
Region of Enrollment
Chile
10 participants16 participants26 participants
Region of Enrollment
Czech Republic
12 participants17 participants29 participants
Region of Enrollment
France
25 participants25 participants50 participants
Region of Enrollment
Germany
91 participants88 participants179 participants
Region of Enrollment
Hong Kong
2 participants2 participants4 participants
Region of Enrollment
Hungary
21 participants23 participants44 participants
Region of Enrollment
Ireland
3 participants4 participants7 participants
Region of Enrollment
Italy
18 participants23 participants41 participants
Region of Enrollment
Korea, Republic of
28 participants26 participants54 participants
Region of Enrollment
Mexico
9 participants8 participants17 participants
Region of Enrollment
Netherlands
10 participants10 participants20 participants
Region of Enrollment
Poland
59 participants50 participants109 participants
Region of Enrollment
Portugal
3 participants0 participants3 participants
Region of Enrollment
Russian Federation
23 participants16 participants39 participants
Region of Enrollment
Singapore
5 participants5 participants10 participants
Region of Enrollment
Slovakia
8 participants12 participants20 participants
Region of Enrollment
Spain
16 participants13 participants29 participants
Region of Enrollment
Sweden
6 participants3 participants9 participants
Region of Enrollment
Switzerland
10 participants6 participants16 participants
Region of Enrollment
Taiwan
21 participants22 participants43 participants
Region of Enrollment
Turkey
1 participants2 participants3 participants
Region of Enrollment
Ukraine
56 participants71 participants127 participants
Region of Enrollment
United Kingdom
23 participants21 participants44 participants
Sex: Female, Male
Female
172 Participants163 Participants335 Participants
Sex: Female, Male
Male
385 Participants405 Participants790 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
— / —— / —
other
Total, other adverse events
532 / 548537 / 562
serious
Total, serious adverse events
325 / 548244 / 562

Outcome results

Primary

Overall Survival Time (OS)

Time from randomization to death. Patients without event are censored at the last date known to be alive or at the clinical cut-off date, whatever is earlier.

Time frame: Time from randomisation to death or last day known to be alive, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

Population: ITT

ArmMeasureValue (MEDIAN)
Cetuximab Plus ChemotherapyOverall Survival Time (OS)11.3 months
Chemotherapy AloneOverall Survival Time (OS)10.1 months
Comparison: Primary efficacy analysis: To test equality of OS time between treatment groups, applying the two-sided stratified log-rank test (Stage IIIb vs IV, ECOG 0/1 vs 2) (α=5%).p-value: 0.0441Stratified Log Rank
Secondary

A Population Pharmacokinetic (PK) Analysis for Cetuximab in Non-Small Cell Lung Cancer (NSCLC) - Serum Cetuximab Concentrations

Population PK analysis was conducted using non-linear mixed effects modeling (NONMEM) software, integrating the PK data from this study and the Phase II study EMR 62 202-011.

Time frame: Week 1, Day 1: baseline and end of infusion; Week 7, Day 43: within 12 h after cetuximab administration.

ArmMeasureValue (MEAN)Dispersion
Cetuximab Plus ChemotherapyA Population Pharmacokinetic (PK) Analysis for Cetuximab in Non-Small Cell Lung Cancer (NSCLC) - Serum Cetuximab Concentrations223.1 ug/mLStandard Deviation 64.6
Chemotherapy AloneA Population Pharmacokinetic (PK) Analysis for Cetuximab in Non-Small Cell Lung Cancer (NSCLC) - Serum Cetuximab Concentrations51.5 ug/mLStandard Deviation 33.1
Secondary

Best Overall Response Rate

The best overall response rate is defined as the proportion of subjects having achieved confirmed Complete Response + Partial Response as the best overall response according to radiological assessments (based on modified WHO criteria).

Time frame: Evaluations were performed every 6 weeks until progression, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

ArmMeasureValue (NUMBER)
Cetuximab Plus ChemotherapyBest Overall Response Rate36.4 percentage of participants
Chemotherapy AloneBest Overall Response Rate29.2 percentage of participants
Comparison: The best overall response rate was compared in the Cochran-Mantel-Haenszel test (two-sided with α=5%).p-value: 0.0101Cochran-Mantel-Haenszel
Secondary

Disease Control Rate

The disease control rate is defined as the proportion of subjects having achieved confirmed Complete Response + Partial Response + Stable Disease as best overall response according to radiological assessments (based on modified WHO criteria).

Time frame: Evaluations were performed every 6 weeks until progression, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

Population: ITT

ArmMeasureValue (NUMBER)
Cetuximab Plus ChemotherapyDisease Control Rate72.5 percentage of participants
Chemotherapy AloneDisease Control Rate71.5 percentage of participants
Comparison: The disease control rate was compared in the Cochran-Mantel-Haenszel test (two-sided with α=5%).p-value: 0.6801Cochran-Mantel-Haenszel
Secondary

Progression-free Survival Time

Duration from randomization until radiological progression (based on modified World Health Organisation (WHO) criteria) or death due to any cause. Only deaths within 60 days of last tumor assessment are considered. Patients without event are censored on the date of last tumor assessment.

Time frame: Time from randomization to disease progression, death or last tumor assessment, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

Population: ITT

ArmMeasureValue (MEDIAN)
Cetuximab Plus ChemotherapyProgression-free Survival Time4.8 months
Chemotherapy AloneProgression-free Survival Time4.8 months
Comparison: To test equality of progression free survival time between treatment groups, applying the two-sided stratified log-rank test (α=5%).p-value: 0.3869Stratified Log Rank
Secondary

Quality of Life Assessment (EORTC QLQ-C30) Social Functioning

Mean social functioning scores (EORTC QLQ-C30) against time for each treatment group. Scores were derived from mutually exclusive sets of items, with scale scores ranging from 0 to 100 after a linear transformation. Higher scores indicate a higher level of functioning.

Time frame: at baseline, at cycle 3, at month 6, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

Population: 670 subjects completed (348 in the cetuximab + chemotherapy arm and 322 in the chemotherapy alone arm) at least 1 evaluable QLQ-C30 questionnaire and were included in the Evaluable population. Numbers at each timepoint were (Cetuximab + chemotherapy/Chemotherapy alone, respectively): baseline 280/275; cycle 3 185/153; 6 month 101/97

ArmMeasureGroupValue (LEAST_SQUARES_MEAN)Dispersion
Cetuximab Plus ChemotherapyQuality of Life Assessment (EORTC QLQ-C30) Social FunctioningAt baseline66.17 scores on a scaleStandard Error 2.836
Cetuximab Plus ChemotherapyQuality of Life Assessment (EORTC QLQ-C30) Social FunctioningAt cycle 358.05 scores on a scaleStandard Error 2.995
Cetuximab Plus ChemotherapyQuality of Life Assessment (EORTC QLQ-C30) Social FunctioningAt month 667.36 scores on a scaleStandard Error 3.449
Chemotherapy AloneQuality of Life Assessment (EORTC QLQ-C30) Social FunctioningAt baseline64.73 scores on a scaleStandard Error 2.825
Chemotherapy AloneQuality of Life Assessment (EORTC QLQ-C30) Social FunctioningAt cycle 367.13 scores on a scaleStandard Error 3.138
Chemotherapy AloneQuality of Life Assessment (EORTC QLQ-C30) Social FunctioningAt month 666.47 scores on a scaleStandard Error 3.515
Secondary

Quality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health Status

Mean global health status scores (EORTC QLQ-C30) against time for each treatment group. Scores were derived from mutually exclusive sets of items, with scale scores ranging from 0 to 100 after a linear transformation. Higher scores indicate a better QoL.

Time frame: at baseline, at cycle 3, at month 6, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

Population: 670 subjects completed (348 in the cetuximab + chemotherapy arm and 322 in the chemotherapy alone arm) at least 1 evaluable QLQ-C30 questionnaire and were included in the Evaluable population. Numbers at each timepoint were (Cetuximab + chemotherapy/Chemotherapy alone, respectively): baseline 278/274; cycle 3 184/153; 6 month 102/96

ArmMeasureGroupValue (LEAST_SQUARES_MEAN)Dispersion
Cetuximab Plus ChemotherapyQuality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health StatusAt baseline45.72 scores on a scaleStandard Error 2.164
Cetuximab Plus ChemotherapyQuality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health StatusAt cycle 348.33 scores on a scaleStandard Error 2.325
Cetuximab Plus ChemotherapyQuality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health StatusAt month 654.71 scores on a scaleStandard Error 2.729
Chemotherapy AloneQuality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health StatusAt baseline46.36 scores on a scaleStandard Error 2.138
Chemotherapy AloneQuality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health StatusAt cycle 351.55 scores on a scaleStandard Error 2.464
Chemotherapy AloneQuality of Life (QOL) Assessment European Organisation for the Research and Treatment of Cancer (EORTC) QLQ-C30 Global Health StatusAt month 652.92 scores on a scaleStandard Error 2.787
Secondary

Safety - Number of Patients Experiencing Any Adverse Event

Please refer to Adverse Events section for further details

Time frame: time from first dose up to 30 after last dose of study treatment, reported between day of first patient randomised, Oct 2004, until cut-off date 18 Jul 2007

Population: Safety Population

ArmMeasureValue (NUMBER)
Cetuximab Plus ChemotherapySafety - Number of Patients Experiencing Any Adverse Event545 participants
Chemotherapy AloneSafety - Number of Patients Experiencing Any Adverse Event549 participants

Source: ClinicalTrials.gov · Data processed: Apr 3, 2026