Abstract B28: Clinicopathological features associated with late recurrence of gastric cancer

Abstract

Background: Because most cases of cancer recurrence occur within 5 years, routine surveillance is also recommended for first five years. However, few patients experience late recurrence of disease, and the mechanism of late recurrence is not clearly revealed. The purpose of this study is to evaluate the clinicopathological features predicting the risk of late recurrence in gastric cancer patients. Methods: From January 2006 to December 2013, we retrospectively reviewed 813 patients who were diagnosed and treated with gastric cancer in Yonsei cancer center. Result: Among 226 patients who experienced recurrence of gastric cancer, 212 patients were diagnosed with recurrence within first five years from the curative resection of primary cancer, and 14 patients were diagnosed with recurrence of disease beyond 5 years. In comparison with early recurrence (≤ 5 years), the patients with late recurrence (> 5 years) had primary disease of stage I/II (vs. stage III; HR, 4.5; 95% CI, 1.5-14.1; P=0.009), well or moderately differentiated histology (vs. poorly differentiated or signet ring cell; HR, 4.2; 95% CI, 1.4-13.1; P=0.013), and did not receive adjuvant chemotherapy (HR, 0.3; 95% CI, 0.1-0.9; P=0.028). All the 21 patients with HER2 positive gastric cancer experienced early recurrence. Conclusion: Late recurrence of gastric cancer is possibly not influenced by advanced stage of primary disease. More attempts to find high risk groups for late recurrence of gastric cancer are needed. Citation Format: Ji Soo Park, Chu Ree Won, Taeil Son, Hyoung-Il Kim, Woo Jin Hyung, Sung Hoon Noh, Tae Il Kim. Clinicopathological features associated with late recurrence of gastric cancer. [abstract]. In: Proceedings of the AACR Special Conference: Improving Cancer Risk Prediction for Prevention and Early Detection; Nov 16-19, 2016; Orlando, FL. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2017;26(5 Suppl):Abstract nr B28.