A Study of LY4337713 in Participants With FAP-Positive Solid Tumors

Inclusion Criteria: * Must have clinical or imaging evidence of fibroblast activation protein (FAP) expression per local assessment * Must have histologically or cytologically confirmed diagnosis of one of the following: * Adenocarcinoma of the pancreas * Hormone receptor (HR)-positive human epidermal growth factor 2 (HER2)-negative breast cancer * HER2-positive breast cancer * Triple negative breast cancer (TNBC) * Platinum-resistant or refractory ovarian cancer (including ovarian carcinosarcoma) * Other solid tumors * Gastric cancer (adenocarcinoma) * Colorectal cancer (CRC) * Esophageal cancer (squamous cell carcinoma or adenocarcinoma) * Cholangiocarcinoma * Must have received prior treatments as indicated below: * Phase 1a * Adenocarcinoma of the pancreas: Participants must have received at least 1, but no more than 2 prior regimens for locally advanced unresectable or metastatic disease. * HR-positive HER2-negative breast cancer: Participants must have received less than or equal to (≤)5 prior lines of treatment for advanced or metastatic disease, which must include a cyclin-dependent kinase 4/6 inhibitor. * HER2-positive breast cancer: Participants must have received at least 2 lines of HER2-targeted therapy, which should include at least 1 antibody-drug conjugate (ADC) for metastatic disease (if locally available). * TNBC: Participants must have received at least 2 lines of therapy for metastatic disease. * Platin…