![A retrospective observational study of clinicopathological features of KRAS, NRAS, BRAF and PIK3CA mutations in Japanese patients with metastatic colorectal cancer](https://timtailieu.net/upload/document/563199/w126_h160_a-retrospective-observational-study-of-clinicopathological-features-of-kras-nras-braf-and-pik3ca-mutations-in-japanese-patients-with-metastatic-colore-563199.jpg)
A retrospective observational study of clinicopathological features of KRAS, NRAS, BRAF and PIK3CA mutations in Japanese patients with metastatic colorectal cancer
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