Abstract 3187
Background
REGATTA is a phase III trial to compare chemotherapy alone (arm A) and reduction surgery followed by chemotherapy (arm B) for advanced gastric cancer with a single non-curable factor. The trial failed to show superiority of reduction surgery, which could be partially explained by poor compliance of chemotherapy in arm B. This exploratory analysis aims to clarify whether upfront surgery has survival benefit in patients (pts) who could continue chemotherapy for some period, enrolled in REGATTA.
Methods
In REGATTA, 175 pts were assigned to arm A (86 pts) and arm B (89 pts). S-1 80 mg/m2 for 3 weeks and CDDP 60 mg/m2 on day 8 was repeated every 6 weeks. The pts were limited to those for whom chemotherapy was continued at 2, 4, or 6 months after randomization (cohort-2M, cohort-4M, or cohort-6M, respectively) and pts who underwent gastrectomy in arm A were excluded. The overall survival (OS) was defined as the duration from the date at 2, 4, or 6 months after randomization to the date of the death from any cause or to the last date of contact for a surviving pt.
Results
Examined pts were 130 (59 in arm A and 71 in arm B) in cohort-2M, 111 (50 in arm A and 61 in arm B) in cohort-4M, and 90 (43 in arm A and 47 in arm B) in cohort-6M, respectively. In cohort-2M, the median survival time (MST) was 14.1 months (m) (95% CI, 11.7-16.6) in arm A and 12.6 m (9.9-15.9) in arm B with hazard ratio (HR) of 0.935 (0.641-1.635). The OS was 9.7% (3.2-20.5) in arm A and 17.9% (9.2-28.8) in arm B at 3-year. In cohort-4M, the MST was 13.1 m (10.3-18.8) in arm A and 11.5 m (8.4-15.1) in arm B with HR of 0.954 (0.629-1.448). The OS was 11.5% (3.8-24.0) in arm A and 21.2% (11.0-33.6) in arm B at 3-year. In cohort-6M, the MST was 13.8 m (9.8-22.1) in arm A and 10.9 m (6.6-16.6) in arm B with HR of 0.860 (0.535-1.383). The OS was 13.2% (4.3-27.0) in arm A and 26.0% (13.1-41.0) in arm B at 3-year.
Conclusions
Among pts having certain period of chemotherapy, there seem to be more long survivors in arm B than the arm A. Reduction surgery may still be promising if chemotherapy compliance after surgery could be improved.
Clinical trial identification
UMIN000001012, Feb 2008.
Editorial acknowledgement
Legal entity responsible for the study
Japan Clinical Oncology Group (JCOG).
Funding
The Ministry of Health, Labour and Welfare of Japan and the Korean Gastric Cancer Association.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
2107 - Role of Individualized Intervention(s) on Quality of Life (QOL) and Adherence to Adjuvant Endocrine Therapy in Premenopausal Women with Early-Stage Breast Cancer (BC): MyChoice Study
Presenter: Shahid Ahmed
Session: Poster Display session 2
Resources:
Abstract
5812 - Correlation between the density of tumor-infiltrating lymphocytes, immune cell subsets in tumor stroma and response to systemic therapy in breast cancer
Presenter: Cvetka Grasic Kuhar
Session: Poster Display session 2
Resources:
Abstract
4734 - BRCA1/2 Testing in HER2- Advanced Breast Cancer (ABC): Results from the European Component of a Multi-Country Real World Study
Presenter: Michael Patrick Lux
Session: Poster Display session 2
Resources:
Abstract
1686 - In vitro and in vivo rescue of resistance to BET inhibitors by targeting PLK1 in triple negative breast cancer.
Presenter: Cristina Nieto-jiménez
Session: Poster Display session 2
Resources:
Abstract
5020 - Neoadjuvant endocrine therapy in combination with melatonin and metformin in locally advanced breast cancer
Presenter: Tatiana Semiglazova
Session: Poster Display session 2
Resources:
Abstract
5082 - Melatonin and metformin in neoadjuvant chemotherapy in locally advanced breast cancer
Presenter: Tatiana Semiglazova
Session: Poster Display session 2
Resources:
Abstract
2642 - Patient-tailored tamoxifen dosing based on an increased quantitative understanding of its complex pharmacokinetics: A novel integrative modelling approach
Presenter: Anna Mueller-Schoell
Session: Poster Display session 2
Resources:
Abstract
2461 - Lack of benefit of neoadjuvant pertuzumab in high risk HER2 positive breast cancer. A retrospective case-control study of 355 cases with biomarker analysis.
Presenter: Manuela Tiako Meyo
Session: Poster Display session 2
Resources:
Abstract
4776 - Targeting CDCA3 to improve chemotherapy response in triple-negative breast cancer patients
Presenter: Kenneth O'Byrne
Session: Poster Display session 2
Resources:
Abstract
1674 - Activity of BET-proteolysis targeting chimeric (PROTAC) compounds in triple negative breast cancer
Presenter: María Del Mar Noblejas López
Session: Poster Display session 2
Resources:
Abstract