A Study of Sigvotatug Vedotin in Advanced Solid Tumors

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• Disease indication; Participants must have histologically or cytologically confirmed metastatic or unresectable solid malignancy within one of the tumor types listed below (dependent on study part); Non-small cell lung cancer (NSCLC); Head and neck squamous cell cancer (HNSCC); Advanced HER2-negative breast cancer; Esophageal squamous cell carcinoma (ESCC); Esophageal/Gastro-esophageal junction adenocarcinoma (EAC/GEJ); Cutaneous squamous cell cancer (cSCC); Exocrine pancreatic adenocarcinoma; Bladder cancer; Cervical cancer; Gastric cancer; High grade serous ovarian cancer (HGSOC); Part A only: Participants must have disease that is relapsed or refractory or be intolerant to standard-of-care therapies and should have no appropriate standard-of-care therapeutic options; Part B only: Participants must have disease that is relapsed or refractory or be intolerant to standard-of-care therapies. Participants must have received platinum-based therapy and a PD-1/PD-(L)1 inhibitor, if applicable and available; Part C only: For pembrolizumab combination cohorts, participants must be eligible for pembrolizumab per local standard of care. For pembrolizumab with cisplatin or carboplatin, participants must be eligible for both pembrolizumab and the platinum agent per local standard of care. Participants must be treatment naïve for locally advanced or metastatic systemic therapy (prior definitively intended or [neo]adjuvant therapy is allowed); Part D only: Participants must be treatment naïve for locally advanced or metastatic systemic therapy
• Participants enrolled in the following study parts should have a tumor site accessible for biopsy and agree to biopsy as follows:; Disease-specific expansion cohorts (Part B and Part D): A baseline fresh tumor biopsy is required. An archival biopsy collected within 90 days prior to first dose of study drug may be used; Biology expansion cohort: pretreatment biopsy and on-treatment (Cycle 1) biopsy
• An Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1
• Measurable disease per the RECIST v1.1 at baseline

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• Known active central nervous system metastases. Participants with previously treated brain metastases may participate provided they:; are clinically stable for at least 4 weeks prior to study entry after brain metastasis treatment,; have no new or enlarging brain metastases, and; are off of corticosteroids prescribed for symptoms associated with brain metastases for at least 7 days prior to first dose of study drug; In Part D, participants with untreated, asymptomatic CNS metastases smaller than 1 cm may be enrolled without definitive treatment as long as they have no neurological symptoms, no or minimal surrounding edema, and no requirements for corticosteroids
• Previous receipt of an MMAE-containing agent or an agent targeting integrin beta-6
• Any uncontrolled Grade 3 or higher (per NCI CTCAE v5.0) viral, bacterial, or fungal infection within 2 weeks prior to the first dose of sigvotatug vedotin; Routine antimicrobial prophylaxis is permitted
• Part C and D: Prior therapy with a PD-1 inhibitor, anti-PD-(L)1, or anti PD-L2 agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor and was discontinued from that treatment due to a Grade 3 or higher immune-mediated adverse event (IMAE)
• History of another malignancy within 3 years before first dose of study drug, or any evidence of residual disease from a previously diagnosed malignancy. Exceptions are malignancies with a negligible risk of metastasis or death
• Pre-existing neuropathy Grade 1 or greater per the National Cancer Institute's Common Terminology Criteria for Adverse Events, version 5.0 (NCI CTCAE v5.0) for Parts C and D cohorts with cisplatin or carboplatin; Grade 2 or greater per the NCI CTCAE v5.0 for all other cohorts
• Grade ≥3 pulmonary disease unrelated to underlying malignancy. This includes clinically severe pulmonary function compromise resulting from clinically significant pulmonary illnesses
• History of noninfectious interstitial lung disease (ILD) or pneumonitis that required steroids, current ILD or pneumonitis, or suspected ILD or pneumonitis that cannot be ruled out by imaging at screening
• Known diffusing capacity of the lung for carbon monoxide (DLCO; adjusted for hemoglobin) <50% predicted
• Carcinomatous meningitis
• Investigator site staff directly involved in the conduct of the study and their family members, site staff otherwise supervised by the investigator, and sponsor and sponsor delegate employees directly involved in the conduct of the study and their family members