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Has histologically- or cytologically confirmed diagnosis of NSCLC Stage IIIB\u002FC or IV not eligible for curative intent surgery or chemoradiation\n2. Part 1: Tumor tissue EGFR or HER2 exon 20 insertion mutations confirmed by qualified local laboratories. Parts 2 and 3: EGFR\u002FHER2 exon 20 insertion mutations confirmed by qualified local laboratories\n3. Part 1: Has received all approved therapies for advanced or metastatic NSCLC or is ineligible. Part 2 and Part 3: Has received at least 1, but not more than 2, prior lines of approved treatment for advanced or metastatic NSCLC, 1 of which must be platinum-based chemotherapy unless contraindicated\n4. Has documented tumor progression (based on radiological imaging)\n5. Has new or recent tumor biopsy (collected at screening, if feasible) or archival tumor specimen collected in the past 10 years available for genomic profiling\n6. Has at least one measurable tumor lesion per RECIST v1.1\n7. Is ≥18 years of age at the time of signing the ICF\n8. Has Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1\n\nKey Exclusion Criteria:\n\n1. Has a tumor that is known to harbor EGFR ex20ins p.H773\\_V774insH variant, or any EGFR kinase domain activating mutation concurrent with either a T790M and\u002For C797S resistance mutations\n2. Has history (within ≤2 years before screening) of solid tumor or hematological malignancy that is histologically distinct from NSCLC\n3. Has symptomatic brain or spinal metastases\n4. Has toxicities from previous anticancer therapies that have not resolved to baseline levels or to CTCAE Grade ≤1, except for alopecia and peripheral neuropathy\n5. Has any condition for which, in the opinion of the investigator, participation would not be in the best interest of the participant (e.g., could compromise the participant's well-being) or would prevent, limit, or confound the protocol-specified assessments","ALL","18 Years",{"count":289,"type":290},345,"ESTIMATED","INTERVENTIONAL",[293,294],"PHASE1","PHASE2","Study STX-721-101\u002FPFL-721CI101 is an open label, Phase 1\u002F2 study evaluating the safety, tolerability, pharmacokinetic (PK) exposure, and preliminary antitumor activity of STX-721\u002FPFL-721 in participants with non-small cell lung cancer (NSCLC) carrying EGFR or HER2 exon 20 insertion (ex20ins) mutations.",[297,298,299],"Non-Small Cell Lung Cancer","NSCLC","EGFR\u002FHER2 Exon 20 Insertion Mutation",[301],"Exon 20, EGFR, HER2, NSCLC, TKI","2026-05-20",{"date":304,"type":305},"2026-05-22","ACTUAL",{"date":307,"type":305},"2023-09-26",{"date":309,"type":290},"2029-12-01",{"name":5,"class":6},24]