To compare the GEs of the APOA1/C3/A4/A5 in breast tumors of the age <50 years/ER+/HER2− subgroup between Asians and Caucasians, we retrieved the raw data from the GSE2019420 and GSE4525521 datasets, which included tumors from multiple races. The gene discussed is ESR1; the disease is breast neoplasm.