Gefitinib is a drug used in the treatment of certain types of cancer. Gefitinib selectively targets the mutant proteins in malignant cells

Gefitinib is currently only indicated for the treatment of locally advanced or metastatic non-small cell lung cancer (NSCLC) in patients who have previously received chemotherapy.

While gefitinib has yet to be proven to be effective in other cancers, there is certainly potential for its use in the treatment of other cancers where EGFR overexpression is involved