Study of AMG 650 in Adult Participants With Advanced Solid Tumors

Inclusion Criteria: * Male and female ≥ 18 years old * Triple Negative Breast Cancer participants only: Participant must have histologically or cytologically confirmed metastatic or locally recurrent estrogen receptor (ER)-negative (\<1% by immunohistochemistry \[IHC\]), progesterone receptor (PR)-negative (\<1% IHC) and human epidermal growth factor receptor 2 (Her2)-negative (either fluorescent in situ hybridisation \[FISH\] negative, 0 or 1+ by IHC, or IHC2+ and FISH negative per ASCO/CAP definition) breast cancer. Participant must be relapsed/refractory to at least one line of systemic chemotherapy in the metastatic setting (excluding neoadjuvant or adjuvant chemotherapies) or intolerant of existing therapy(ies) known to provide clinical benefit or have no other available treatment options. Prior exposure to an immune checkpoint inhibitor is allowed. * Platinum-Resistant High Grade Serous Ovarian Cancer, primary peritoneal cancer and/or fallopian-tube cancer participants only: Participant must have histologically or cytologically confirmed diagnosis of metastatic or unresectable high grade serous ovarian cancer, with platinum-resistance defined as progression during or within 6 months of a platinum-containing regimen, with no other treatment option available. Prior exposure to platinum-resistant recurrence therapy is allowed. * Serous Endometrial Cancer participants only (Dose Exploration only): Participant must have histologically or cytologically confirmed diagnosis of…