Impact of Adjuvant Chemotherapy Cycles on Prognosis of Resectable Stomach Cancer: A Retrospective Analysis

Aims: The aim of this study was to investigate the effects of adjuvant chemotherapy cycles on the prognosisof patients with post-operative stomach cancer through retrospective analysis.
Methods: A total of 128 patientswith gastric cancer who underwent gastrectomy, followed by adjuvant chemotherapy consisting of epirubicin,cisplatin or oxaliplatin, leucovorin, and 5-fluorouracil, according to a defined schedule, were divided into threegroups according to the number of chemotherapy cycles: Group I (<6 cycles); Group II (6 cycles); and GroupIII (>6 cycles).
Results: The 5-year overall survival (OS) was 20.8% in Group I, 45.0% in Group II, and 42.9%in Group III, with a median follow-up of 43 months. The 5-year relapse-free survival (RFS) was 15.1% in GroupI, 40% in Group II, and 40% in Group III. The OS and RFS in Groups II and III were significantly betterthan in Group I (OS, p = 0.002 and p=0.003; RFS, P<0.001 and P=0.002). There was no difference in OS (p =0.970) or in RFS (p = 0.722) between Groups II and III. Multivariate Cox hazard analysis determined that thenumber of adjuvant chemotherapy cycles was an independent factor that influenced OS and RFS.
Conclusion:Six cycles of adjuvant chemotherapy gave encouraging outcomes in patients with resectable gastric cancer.Further prospective randomized controlled investigations are warranted in a multi-center setting.