LY3537021 for Nausea and Vomiting from Chemotherapy

Inclusion Criteria: * Chemotherapy-naive participants, planned to receive AC or cisplatin-based chemotherapy greater than or equal to (≥)70 milligrams per square meter (mg/m²), on Day 1 of each cycle, with no multiple administrations during the CINV observation period, from Day 2 to Day 5 of each cycle. * Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2. Exclusion Criteria: * Have symptomatic or untreated central nervous system (CNS) metastases. * Have an established diagnosis of uncontrolled diabetes mellitus. * Have a history of, or current evidence of, a clinically significant cardiac condition or QT/QTcF-related conditions. * Have another etiology for nausea and vomiting, or receives medications with know or potential antiemetic activity * Signs, symptoms or history of thyroid tumors * Receives treatment with a gastric inhibitory polypetide (GIP) or glucagon-like peptide-1 (GLP-1) receptor agonist within 4 weeks prior to chemotherapy. * Have participated in a clinical study involving study intervention within 30 days of Cycle 1 Day 1 (C1D1). If the previous study intervention has a long half-life, within 3 months or 5 halflives, whichever is longer, of C1D1. * Are pregnant, breastfeeding, or intend to become pregnant during the study or within 30 days of the last dose of study intervention.