105 Background: It remains uncertain whether every patient with advanced gastric cancer (AGC) who progresses after first-line chemotherapy should receive second-line chemotherapy. We conducted the present study to identify the optimal indications for second-line chemotherapy. Methods: In this retrospective study, 101 patients were included in univariate and multivariate analyses to identify clinicopathological variables independently associated with longer survival post progression (SPP), defined as the time from recognition of disease progression on first-line chemotherapy to death from any cause or last follow-up. Results: Median SPP of all patients was 340 days. On multivariate analysis, both performance status (PS) 2 (hazard ratio (HR), 14.234; 95% confidence interval (CI), 2.766–73.258), serum albumin (Alb) level < 3.5 g/dl (HR, 2.088; 95% CI, 1.047–4.060) at initiation of second-line chemotherapy, and time to progression (TTP) < 170 days on first-line chemotherapy (HR, 2.497; 95% CI, 1.227–5.083) were identified as independent prognostic factors for shorter SPP. Median SPP was 496, 375, and 232 days in patients with 0, 1, and 2 of these 3 negative prognostic factors, respectively (p = 0.0002). Conclusions: The present study suggests that second-line chemotherapy would be less beneficial in patients with 2 or more of the following 3 negative prognostic factors: PS 2, Alb < 3.5 g/dl at initiation of second-line chemotherapy, and TTP < 170 days on first-line chemotherapy.