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. 2017 Aug 2;8(13):2532–2541. doi: 10.7150/jca.19750

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Subgroup analysis according to histological type of the survival of patients with lung cancer and diabetes who received metformin vs. non-metformin treatment. (A) Forest plot of effects of metformin vs. non-metformin treatment on the overall survival (OS) of diabetic patients with non-small cell lung cancer (NSCLC); (B) Forest plot of effects of metformin vs. non-metformin treatment on the progression-free survival (PFS) of diabetic patients with NSCLC; (C) Forest plot of effects of metformin vs. non-metformin treatment on the OS of diabetic patients with small cell lung cancer (SCLC); (D) Forest plot of effects of metformin vs. non-metformin treatment on the PFS of diabetic patients with SCLC.