TGFB1 and esophageal squamous cell carcinoma: M2‐type tumor‐associated macrophages (M2‐TAMs)‐derived tumor growth factor beta 1 (TGF‐β1) can diminish the responsiveness of esophageal squamous cell carcinoma (ESCC) cells to cisplatin, and knockdown of TGF‐β1 could reverse this effect.33