A Study to Evaluate the Impact of Management Strategies on Gastrointestinal-Related Adverse Events in Participants With Non-Small Cell Lung Cancer Harboring Epidermal Growth Factor Receptor (EGFR) Exon 20 Insertion Mutations Receiving TAK-788

1. Has been diagnosed with another primary malignancy other than NSCLC, except for the following:

1. Adequately treated non-melanoma skin cancer or cervical cancer in situ.

2. Definitively treated non-metastatic prostate cancer.

3. Non-NSCLC primary malignancies that are definitively relapse-free for ≥3 years.

2. Has unstable brain metastases to include previously untreated intracranial central nervous system (CNS) metastases or previously treated intracranial CNS metastases with radiologically documented new or progressing CNS lesions.

\- Brain metastases that are stable do not preclude eligibility if they have been treated with surgery and/or radiation, and have been stable without requiring corticosteroids to control symptoms within 7 days before randomization, and have no evidence of new or enlarging brain metastases.

3. Has a current spinal cord compression (symptomatic or asymptomatic that is detectable by radiographic imaging) or leptomeningeal disease (symptomatic or asymptomatic).

4. Currently has or has had a history of interstitial lung disease, to include radiation or drug related pneumonitis that requires/required steroid treatment.

5. Has an ongoing or active infection, to include but not limited to infections requiring intravenous antibiotics or has a known history of HIV. Testing for HIV is not required in the absence of history.

Note: Hepatitis B surface antigen-positive participants are allowed to enroll if hepatitis B virus (HBV) deoxyribonucleic acid (DNA) is below 1000 copies/mL in the plasma. Patients who are positive for anti-hepatitis C virus antibody can be enrolled but must not have detectable hepatitis C virus (HCV) RNA in the plasma.

6. Have uncontrolled hypertension. Participants with hypertension should be under treatment on study entry to control blood pressure.

7. A prolonged QTcF interval, or is being treated with medications known to be associated with the development of Torsades de Pointes.

8. Has a GI illness or disorder, including but not limited to a history of GI perforation, that could affect oral absorption of TAK-788.

What this study is about