Adjuvant chemoradiation versus chemotherapy for stage III gastric cancer after surgery with curative intent

Gastric cancer is often diagnosed at an advanced stage and surgery alone cannot guarantee satisfactory results. Both chemoradiotherapy (CRT) and chemotherapy (CT) are used in postoperative therapy. However, it is controversial whether CRT or CT is better after D2 lymphadenectomy. In this study we investigated the efficacy of adjuvant CRT versus CT in stage III gastric cancer patients treated with R0 gastrectomy and D2 lymph node dissection.

Data from 92 patients diagnosed with gastric adenocarcinoma and treated with surgery followed by adjuvant treatment were retrospectively analyzed. Patients were classified into two groups depending on type of adjuvant treatment such as CT (Arm A) and CRT (Arm B).

Twenty-one patients in Arm A and 71 patients in Arm B were included. Median age at diagnosis was 60 years. The median follow-up time was 30 months. No difference in local recurrence (14.3 vs 15.7%, P = 0.89), peritoneal recurrence (29.4 vs 23.5%, P = 0.62), and distant metastases rates (57.1 vs 45.1%, P = 0.42) were observed between the arms. Disease-free survival (DFS) rates did not differ between Arms A and B (26 and 22 months, P = 0.80) respectively. Median overall survival (OS) in Arm A was 29 months and it was 32 months for Arm B. There was no difference in 5-year OS and DFS between Arms A and B (23.8 vs 34.4%, P = 0.74; and 24.1 vs 32.9%, P = 0.80).

Adjuvant CRT does not appear to improve clinical outcomes compared to adjuvant CT in this study and prospective studies are required to confirm these results.