Allele polymorphisms of tumor integrins correlate with peritoneal carcinosis capability of gastric cancer cells in radically resected patients

Background: Preclinical studies suggested that integrins are relevant for gastric cancer diffusion. We investigated integrins polymorphisms role in determining peritoneal carcinosis or hematogenous metastases in radically resected gastric cancer. Patients and methods: Integrins genotyping was carried out on pT3 radically resected gastric tumors recurring with either peritoneal-only carcinosis or hematogenous metastases. Results: The following factors resulted independently associated with peritoneal carcinosis or hematogenous metastases: the A genotype of rs2269772 (ITGA3) [odds ratio (OR) for peritoneal carcinosis: 22.2, 95% confidence interval 1.2-40, P = 0.03], the G genotype of rs2269772 (ITGA3) (OR for hematogenous metastases: 5.5, 95% confidence interval 2.2-14.15, P = 0.0003), the C genotype of rs11902171 (ITGV) (OR for peritoneal carcinosis: 6.8, 95% confidence interval 1.3-33.4, P = 0.01), the G genotype of rs11902171 (ITGV) (OR for hematogenous metastases: 2.5, 95% confidence interval 1.1-5.7, P = 0.02), diffuse histology (OR for peritoneal carcinosis: 4.7, 95% confidence interval 1.9-11.3, P = 0.0005) and intestinal histology (OR for hematogenous metastases: 4.2, 95% confidence interval 1.9-9.9, P = 0.0008). Conclusions: Tumor histology represents a crucial issue conditioning tumoral behavior; genotyping of rs2269772 (ITGA3) and rs11902171 (ITGV) may be a further asset in the definition of high-risk patients for peritoneal carcinosis among those relapsing after curative resection. The selection tool deriving from this analysis may allow an optimal use of innovative treatment strategies.