TGFB1 and breast cancer: For instance, ellagic acid led to cell cycle arrest of breast cancer cells via the TGF‐β pathway, ginsenoside Rh2 promoted TGF‐β expression to induce cell cycle arrest of leukemia cells, and pirfenidone significantly increased TGF‐β secretion and induced cell cycle arrest of PCa cells.52, 53, 54