This is a study of LY4337713 in participants with certain types of cancer that is advanced or has spread. Participants must have cancer with high levels of a protein called fibroblast activation protein (FAP). The purpose of this study is to evaluate safety, side effects, and efficacy of LY4337713. In addition, this study will evaluate how much LY4337713 gets into the bloodstream, how it is broken down, and how long it takes the body to get rid of it. For each participant, the study will last about 5 years.
Must have clinical or imaging evidence of fibroblast activation protein (FAP) expression per local assessment
Adenocarcinoma of the pancreas
Hormone receptor (HR)-positive human epidermal growth factor 2 (HER2)-negative breast cancer
HER2-positive breast cancer
Have known active central nervous system (CNS) metastases or carcinomatous meningitis.
Have significant cardiovascular disease
Have prolongation of the corrected QTcF >470 milliseconds (msec) during screening. QTcF is calculated using Fridericia's Formula: QTcF = QT/(RR0.33)
Have evidence of ongoing and untreated urinary tract obstruction
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Treatment groupsSee each treatment group below.