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Yifeiyin is a Traditional Chinese Medicine (TCM) decoction developed by Tongde Hospital of Zhejiang Province for the treatment of non-small cell lung cancer (NSCLC). It is specifically utilized in patients with EGFR-sensitive mutations to delay the development of resistance to tyrosine kinase inhibitors (TKIs). The formulation is based on the TCM therapeutic principles of "spleen and kidney strengthening" and "detoxifying Sanjie." Clinical research, including the trial ChiCTR2000033640, focuses on evaluating its clinical efficacy and its role in modulating immune mechanisms to improve outcomes in advanced (Stage IIIb-IV) NSCLC patients.
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