Phase I/II Study of BLU-451 in Advanced Cancers With EGFR Exon 20 Insertion Mutations

BLU-451 enrichment at select doses.

BLU-451 monotherapy with dose escalation in participants with metastatic cancer with EGFR Ex20ins or other selected EGFR mutations that have progressed after prior systemic therapies.

BLU-451 with dose escalation in combination with carboplatin and pemetrexed in participants with metastatic NSCLC with common EGFR mutations. This arm will enroll participants only in the United States.

BLU-451 with dose escalation in combination with carboplatin and pemetrexed in participants with metastatic NSCLC with common EGFR mutations. This arm will enroll participants only in the United States.

BLU-451 with dose escalation in combination with carboplatin and pemetrexed in participants with metastatic NSCLC with common EGFR mutations. This arm will enroll participants only in the United States.

EGFR Ex20ins participants who have previously received platinum-based chemotherapy and either amivantamab or mobocertinib will receive BLU-451.

EGFR Ex20ins participants who have previously received platinum-based chemotherapy but have not received a prior EGFR Ex20ins-targeted agent will receive BLU-451.

EGFR Ex20ins participants with at least one measurable lesion in brain per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 who have previously received platinum-based chemotherapy will receive BLU-451. Previous treatment with EGFR Ex20Ins-targeted therapies is allowed but not required.

Participants with EGFR Ex20ins who have previously received platinum-based chemotherapy and both amivantamab AND mobocertinib, OR received any investigational Ex20Ins targeted agent(s) will receive BLU-451. Participants with Ex20ins or atypical mutations enrolled in other cohorts and who have other oncogenic drivers by central testing at baseline will be moved to this arm.

Participants with EGFR Ex20ins who have not received prior systemic therapy in metastatic setting will receive BLU-451.

Participants with EGFR atypical mutations (e.g., G719X, L861Q) who have previously received at least one EGFR tyrosine kinase inhibitor (TKI) will receive BLU-451. Participants with with other atypical EGFR mutations, such as S768I, may be enrolled if approved by Sponsor Medical Monitor.

Participants with EGFR atypical mutations (e.g., G719X, L861Q) who have not received prior systemic therapy in metastatic setting will receive BLU-451. Participants with with other atypical EGFR mutations, such as S768I, may be enrolled if approved by Sponsor Medical Monitor.