This trial will look at a drug called SGN-STNV to find out whether it is safe for patients with solid tumors. It will study SGN-STNV to find out what its side effects are. A side effect is anything the drug does besides treating cancer. It will also study how well SGN-STNV works to treat solid tumors. The study will have two parts. Part A of the study will find out how much SGN-STNV should be given to patients. Part B will use the dose found in Part A to find out how safe SGN-STNV is and if it works to treat certain types of solid tumors.
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Inclusion Criteria:
* Disease indication
* 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 option.
* Non-small cell lung cancer (NSCLC)
* HER2 negative breast cancer
* Ovarian cancer
* Cervical cancer
* Endometrial cancer
* Esophageal cancer
* Gastric cancer and GEJ carcinoma
* Colorectal cancer
* Exocrine pancreatic adenocarcinoma
* Appendiceal adenocarcinoma and pseudomyxoma peritonei of unknown origin
* Participants enrolled in the following study parts should have an appropriate tumor site that satisfies the following criteria:
* Site has tumor that is not a target lesion and has not been previously irradiated (unless progression has occurred since end of radiotherapy)
* Site has tumor that is accessible for a minimally invasive biopsy that does not present a significant risk, AND
* Participant must agree to a biopsy as follows
* Disease-specific expansion cohorts: pre-treatment biopsy, unless medically infeasible following consultation with the medical monitor
* Biology expansion cohort: pretreatment biopsy (required) and additional on-treatment biopsy during Cycle 1 (unless medically infeasible following consultation with the medical monitor)
* Measurable disease per the Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST v1.1) at baseline
* An Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1
* Adequate renal, hepatic, and hematologic function
Exclusion Criteria
* History of another malignancy within 3 years before the first dose of study drug, or any evidence of residual disease from a previously diagnosed malignancy.
* Known active central nervous system metastases
* Carcinomatous meningitis
* Previous receipt of monomethylauristatin E (MMAE)-containing drugs
* Pre-existing neuropathy ≥ Grade 2 per the National Cancer Institute's Common Terminology Criteria for Adverse Events (NCI CTCAE) v5.0
* Any uncontrolled ≥ Grade 3 (per the NCI CTCAE, Version 5.0) viral, bacterial, or fungal infection within 2 weeks prior to the first dose of SGN-STNV
There are additional inclusion and exclusion criteria. The study center will determine if criteria for participation are met.