Basket Study of Neratinib in Participants With Solid Tumors Harboring Somatic HER2 or EGFR Exon 18 Mutations

Inclusion Criteria: * Provide written informed consent * Histologically confirmed cancers for which no curative therapy exists * Documented HER2 or EGFR exon 18 mutation * Participants must agree and commit to use appropriate methods of contraception as outlined in the protocol * At least one measurable lesion, defined by RECIST v1.1 Exclusion Criteria: * Participants harboring ineligible somatic HER2 mutations * Prior treatment with any HER2-directed tyrosine kinase inhibitor (e.g., lapatinib, afatinib, dacomitinib, neratinib) is excluded with the following exception: patients with EGFR exon 18 mutated NSCLC who may have received afatinib, osimertinib, or other pan HER or EGFR TKIs remain eligible * Participants who are receiving any other anticancer agents * Symptomatic or unstable brain metastases * Women who are pregnant or breast-feeding There are additional inclusion and exclusion criteria. The study center will determine if criteria for participation are met.