Germline mutation and protein expression analysis of mismatch repair genes MSH6 and PMS2 in Malaysian Lynch syndrome patients. Int J Colorectal Dis. 2014;29:261-262. [PMID: 24072394 DOI: 10.1007/s00384-013-1770-013-1770-1]

Clinicopathological features and expression of hMLH1 and hMSH2 in Uygur and Han patients with colorectal carcinoma

AIM: To compare the differences in clinicopathological features and expression of hMLH1 and hMSH2 between Uygur and Han patients with colorectal carcinoma.

METHODS: The clinical data for 133 Uygur and 151 Han patients with colorectal carcinoma were analyzed retrospectively. The expression of hMLH1 and hMSH2 proteins was detected in 207 colorectal carcinoma samples, including 98 from Uygur and 109 from Han patients, by immunohistochemical staining.

RESULTS: There were significant differences in onset age, tumor size, pathological differentiation, lymphatic metastasis and tumor stage between the Uygur group and Han group (P < 0.05). In Uygur patients, the loss rate of hMLH1 expression was 9.2% (9/98) in colorectal cancer tissue, and the loss rate of hMSH2 expression was 3.3% (3/98). The loss rate of hMLH1 expression in patients with tumor size > 5 cm was significantly higher than that in patients with tumor size ≤ 5 cm (17.1% vs 3.5%, P < 0.05). The loss rate of hMLH1 expression in patients with lymph node metastasis was 15.1%, significantly higher than that (2.2%) in patients without lymph node metastasis (P < 0.05). The loss rate of hMSH2 in colorectal cancer tissue of Uygur patients (3.1%) was significantly lower than that (10.1%) in Han patients (P < 0.05).

CONCLUSION: There are differences in clinicopathologic features and expression of hMSH2 between Uygur and Han patients with colorectal carcinoma in Xinjiang.