A Study to Test the Safety of the Investigational Drug Larotrectinib in Adults That May Treat Cancer

Inclusion Criteria: * Adult patients with a locally advanced or metastatic solid tumor that has progressed or was nonresponsive to available therapies, are unfit for standard chemotherapy or for which no standard or available curative therapy exists * Proof of a malignancy harboring a NTRK fusion * Eastern Cooperative Oncology Group (ECOG) score of 0, 1 or 2 and a life expectancy of at least 3 months * Adequate hematologic, hepatic, and renal function Exclusion Criteria: * Patients with unstable primary central-nervous-system tumors or metastasis, exceptions possible * Clinically significant active cardiovascular disease or history of myocardial infarction * Active uncontrolled systemic bacterial, viral, or fungal infection * Current treatment with a strong CYP3A4 inhibitor or inducer * Pregnancy or lactation