TYK Medicines, Inc., a clinical-stage biopharmaceutical company, research, development and commercialization of pharmaceutical products. Its lead product candidate is TY-9591, a third-generation epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitor for the treatment of brain metastases from non-small cell lung cancer (NSCLC) with EGFR mutations, and in locally advanced or metastatic NSCLC with EGFR L858R mutatio