Tumor-Agnostic Precision Immuno-Oncology and Somatic Targeting Rational For You (TAPISTRY) Phase 2 Platform Trial: Cohort F: Trastusumab Emtansine in patients with Her2 mutant positive tumors

Inclusion Criteria:

• Patients with Her2 mutant solid malignancies.
• Histologically or cytologically confirmed diagnosis of advanced and unresectable or metastatic solid malignancy
• Measurable disease as defined by Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST v1.1), Response Assessment in Neuro-Oncology (RANO) criteria, or International Neuroblastoma Response Criteria (INRC)
• Performance status as follows: Participantss aged >= 18 years: Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2; Participantss aged 16 to < 18 years: Karnofsky score >= 50%; Participants aged < 16 years: Lansky score >= 50%
• For participants aged >= 18 and <18 years: adequate hematologic and end-organ function
• Disease progression on prior treatment, or previously untreated disease with no available acceptable treatment
• Adequate recovery from most recent systemic or local treatment for cancer
• Life expectancy >= 8 weeks
• Ability to comply with the study protocol, in the investigator's judgment
• For female participants of childbearing potential: Negative serum pregnancy test <= 14 days prior to initiating study treatment; agreement to remain abstinent or use single or combined contraception methods that result in a failure rate of < 1% per year for the period defined in the cohort-specific inclusion criteria; and agreement to refrain from donating eggs during the same period
• For male participants: Willingness to remain abstinent or use acceptable methods of contraception as defined in the cohort-specific inclusion criteria
• In addition to the general inclusion criteria above, participants must meet all of the cohort-specific inclusion criteria for the respective cohort

Overall Response Rate