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- W2243321175 abstract "15511 Background: Previous studies suggest that there are differences in survival among Asian and Caucasian patients with gastric cancer. It remains unclear whether disparities of treatment, differences in staging, or individual tumor biology account for this effect. The present study examines differences among ethnicities in time to tumor recurrence (TTR) in patients with resected gastric cancer. Polymorphisms in thrombin-receptor 1 (PAR1), endostatin (ES), and interleukin 8 (IL-8) are important in angiogenesis and have been implicated in gastric cancer recurrence. We tested whether the frequency of these polymorphisms provide a molecular basis for differences in TTR in different ethnic groups. Methods: Between 1992 and 2007, 105 patients (41 females and 64 males with a median age of 57 yrs; range = 26–85) with gastric adenocarcinoma underwent gastrectomy at the University of Southern California. There were 36 Caucasian, 1 African American, 24 Asian, and 44 Hispanic patients. The median follow-up was 2.4 years (range = 0.1–12.3). 47 of 105 patients (45%) developed tumor recurrence with a 5-year probability of 0.38 ± 0.06. We determined allelic frequencies of PAR1, ES, and IL-8 using PCR-RFLP. Results: Time to recurrence was significantly different by ethnic background (p=0.021, log-rank test). The median TTR for Asians was 7.0 yrs, for Hispanics was 3.7 yrs, and for Caucasians was 1.7 yrs. Gastroesophageal (GE) junction tumors had a shorter TTR compared to other tumor locations (2.1 yrs vs. 3.1 yrs, p=0.021). Allelic frequencies in genes for PAR1 and ES were statistically different between Asians, Hispanics, and Caucasians (PAR1 p=0.008; ES p=0.05), but there were no statistical differences for IL-8. Multivariate analyses including sex and age showed that ethnicity remained significant predicting TTR. Conclusion: Our study demonstrates significant differences in time to recurrence after gastrectomy favoring Asians and Hispanics. Genes in PAR1 and endostatin may provide a molecular basis for differences in TTR and may suggest different biologies of cancer between Caucasian, Hispanic, and Asian populations. Further studies are warranted to characterize molecular markers comparing different ethnic groups with resectable gastric cancer. Author Disclosure Employment or Leadership Consultant or Advisory Role Stock Ownership Honoraria Research Expert Testimony Other Remuneration Bristol-Myers Squibb, Genentech™ BioOncology, ImClone Systems Incorporated, Merck, Pfizer Oncology, Response Genetics Genentech™ BioOncology, Merck, Pfizer Oncology, Roche, sanofi-aventis NIH" @default.
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- W2243321175 date "2008-05-20" @default.
- W2243321175 modified "2023-10-17" @default.
- W2243321175 title "Ethnicity is associated with recurrence in patients with resected gastric cancer" @default.
- W2243321175 doi "https://doi.org/10.1200/jco.2008.26.15_suppl.15511" @default.
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