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Promoter methylation of polo‐like kinase (PLK)1/2/3/4 in lung cancer. A total of lung adenocarcinoma sample included 32 normal and 473 primary tumour samples. A total of lung squamous cell carcinoma sample included 42 normal and 370 primary tumour samples. Promoter methylation of PLK1/2/3/4 was analysed in lung adenocarcinoma (A‐D) and lung squamous cell carcinoma (E‐H) **P < .01 and ***P < .001. LUAD: lung adenocarcinoma and LUSC: lung squamous cell carcinoma
