Clinical trial · Observational
Observation Only Study Involving Participants Enrolled in the CHAT Trial
Follow-Up Observational Study In CHAT Trial Participants With Advanced And/Or Metastatic Breast Cancers That Overexpress HER2, Who Were Randomised To Receive Trastuzumab And Docetaxel With Or Without Capecitabine
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
The aim of the CHAT study ("An open-label, randomized Phase II study of Herceptin (trastuzumab), Taxotere® (docetaxel) and Xeloda (capecitabine) in combination, versus Herceptin (trastuzumab) plus Taxotere® (docetaxel), in patients with advanced and/or metastatic breast cancers that overexpress HER2") was to test the combination of Trastuzumab and Docetaxel with or without capecitabine as first-line therapy for HER2 positive locally advanced or metastatic breast cancer. Overall Response Rate was the primary endpoint of the CHAT study. This study failed to meet its primary objective of showing a difference between the treatment groups, with equivalent high response rates for the Trastuzumab plus Docetaxel and Trastuzumab, Docetaxel plus capecitabine arms. Secondary endpoints in the CHAT study were Progression-Free-Survival, Time-to-Progression, Overall Survival, duration of response and safety profile. Whilst analysis of the existing data is consistent with improvement with the triplet therapy, interpretation is compromised by the relatively short median follow-up of 24 months. In hindsight the statistical design was flawed by selection of a sub optimal primary endpoint and consequently data was collected and analysed early in relation to time-dependent endpoints. Beyond CHAT will permit capture of mature data for time-related endpoints. Time-to-Progression and Overall Survival are the co-primary endpoints for the Beyond CHAT protocol. The impact of treatment following the first progression, on survival, will be explored. Time-to-Progression will be defined from the time interval between the date of randomisation and the occurrence of progressive disease under therapy according to RECIST criteria. Overall Survival will be defined as the time from date of randomisation to date of death
Conditions
Conditions (1)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Breast Cancer | Malignant Breast Neoplasm | CURATED_EXACT | 0.92 |
Interventions
Interventions (0)
Data not yet available
Design
Arms and outcomes
Arms (1)
- label
- CHAT trial participants
- description
- CHAT trial participants whose data was used in the final data analysis for the CHAT study
Primary outcomes (1)
- measure
- The primary endpoints are Time-to-Progression and Overall Survival in the two treatment arms of the CHAT study.
- timeFrame
- survival
Secondary outcomes (3)
- measure
- Progression-Free-Survival
- timeFrame
- 7 years
- measure
- Overall Survival
- timeFrame
- 7 years
- measure
- Anatomical sites of progression
Eligibility
Eligibility (as posted)
- Sex
- Female
Show eligibility criteria text
Inclusion Criteria: * CHAT trial participants whose data was used in the final data analysis for the CHAT study Exclusion Criteria: * Any patients who have withdrawn consent to the CHAT study
References
Publications (0)
Data not yet available