Summary: This research is being done to compare rates of hair loss of people with metastatic breast who use scalp cooling versus those who do not use scalp cooling after receiving standard of care treatment with either sacituzumab govitecan, trastuzumab deruxtecan, or eribulin. The name of the study intervention involved in this study is: * Paxman Scalp Cooling System

Objective: To compare the difference in PFS2 (Time from randomization to disease progression after second therapy) between antibody-drug conjugate (ADC) followed by chemotherapy versus chemotherapy followed by ADC in the treatment of advanced HER2-negative breast cancer. Secondary

Summary: Gastric cancer is the fifth most common malignancy worldwide in terms of both incidence and mortality. The majority of cases are diagnosed at advanced stage-often presenting with severe complications such as malignant stricture, obstruction, bleeding, and cancer-related malnutrition-which impinge on quality of life and survival outcomes. For patients with unresectable or metastatic gastric cancer ...