Abstract
An increased risk of colorectal cancer (CRC) is associated with a western style diet, particularly hyperlipidemia. The expression of G-protein coupled receptor 40 (GPR40), a membrane-bound receptor for long-chain fatty acids (LCFAs), was examined in 36 cases of subserosal-invading CRC and compared with clinicopathological parameters as well as triglyceride (TG) and low-density lipoprotein (LDL) levels in the blood. All patients with CRC expressed GPR40, which was positively associated with blood TG levels (P<0.0001) but not with blood LDL levels. GPR40 expression was positively associated with nodal metastasis, distant metastasis (particularly to the liver), stage and poor prognosis. Patients with high GPR40 expression and high TG levels had comparatively worse survival outcomes compared with patients with low GPR40 expression and low TG levels. The results of the present study suggest that activation of GPR40 may be associated with the progression and prognosis of CRCs. High levels of GPR40 and/or concurrent high levels of GPR40 and TG may be a risk for CRC progression.
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