Research Papers:

Molecular pathological epidemiology of colorectal cancer in Chinese patients with KRAS and BRAF mutations

Wenbin Li _, Tian Qiu, Yun Ling, Lei Guo, Lin Li and Jianming Ying

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Oncotarget. 2015; 6:39607-39613. https://doi.org/10.18632/oncotarget.5551

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Wenbin Li1, Tian Qiu1, Yun Ling1, Lei Guo1, Lin Li1, Jianming Ying1

1Department of Pathology, Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

Correspondence to:

Jianming Ying, e-mail: [email protected]

Keywords: colorectal cancer, KRAS, BRAF, mutation, molecular pathological epidemiology

Received: July 27, 2015     Accepted: October 09, 2015     Published: October 22, 2015


An investigation of interactive effects of exogenous and endogenous factors and tumor molecular changes can lead to a better understanding of tumor molecular signatures in colorectal cancer. We here report a molecular pathological epidemiology study in a large cohort of 945 colorectal cancer patients. Mutations of KRAS (36.6%) and BRAF (3.46%) were nearly mutually exclusive. KRAS-mutated tumors were more common in female patients (odds ratio [OR] = 1.68; P = 0.0001) and never smokers (OR = 1.60; P = 0.001). Whereas BRAF-mutated tumors demonstrated no discrepancy in aspects of gender and smoking status compared with wild-type tumors. In addition, tumors with BRAF or KRAS mutations were in correlation with elevated serum level of carbohydrate antigen (CA19-9) and carcinoma embryonic antigen (CEA) and the combination of serum biomarkers and molecular mutation status may enhance the more precise risk stratification of CRC patients. Further studies are needed to define the mechanism brought about by the aforementioned epidemiologic and clinicopathologic characteristics that may help optimize cancer prevention and precision therapy.

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