Moderate to High Emetogenic Chemotherapy (MEC/HEC) Drugs

The goal of this clinical trial is to learn if medroxyprogesterone acetate oral suspension (Meishiya®) works to prevent nausea and vomiting caused by single-day moderate to high emetogenic chemotherapy (MEC/HEC) in the whole-process management. It will also learn about the safety of medroxyprogesterone acetate oral suspension (Meishiya®). The main questions it aims to answer are: Does medroxyprogesterone acetate oral suspension (Meishiya®) effectively prevent nausea and vomiting induced by single-day MEC/HEC in the whole-process management? What medical problems do participants have when taking medroxyprogesterone acetate oral suspension (Meishiya®)? Researchers will adopt a multicenter, randomized controlled, open-label trial design and compare the effects of medroxyprogesterone acetate oral suspension (Meishiya®) in preventing chemotherapy-induced nausea and vomiting. Participants will be: Stratified based on chemotherapy regimens (HEC vs MEC), gender (male vs female), and age (\<55 years vs ≥55 years) Planned to be 126 subjects who are first-time recipients of single-day MEC/HEC for malignant solid tumors Take medroxyprogesterone acetate oral suspension (Meishiya®) as per the study protocol during the chemotherapy period Visit the research centers at specified intervals for checkups and assessments Record details of nausea, vomiting episodes, and any adverse reactions in a diary