The drug being tested in this study is called TAK-788. TAK-788 administered with or without antidiarrheal prophylaxis is being tested to evaluate the impact of management strategies on gastrointestinal-related adverse events in participants with non-small cell lung cancer harboring EGFR Exon 20 insertion mutations receiving TAK-788.~The study will enroll approximately 90 patients. Participants will be randomly assigned in 1:1 ratio (by chance, like flipping a coin) to one of the two treatment groups-~Cohort 1~Cohort 2~All participants will be asked to take TAK-788 capsules with or without a low-fat meal in Cohort 1 and TAK-788 capsule with antidiarrheal prophylaxis and with or without a low-fat meal in Cohort 2.~This is a multi-center trial and will be conducted worldwide. The overall time to participate in this study is approximately 2 years. Participants will make multiple visits to the clinic after receiving their last dose of drug for a follow-up assessment.
The purpose of the study is to characterize the incidence and severity of TAK-788-associated diarrhea in previously treated participants with locally advanced or metastatic non-small-cell lung cancer (NSCLC) whose tumors harbor EGFR exon 20 insertion mutations treated with TAK-788 when administered with or without intensive loperamide prophylaxis.