Marc Machaalani, MD, analyzed ERBB2 (HER2) amplifications across sex, race, and cancer types in 103,786 patients, finding significant differences. Male esophagogastric cancer patients had higher ERBB2 rates than females, while females with breast cancer had higher rates than males. Asian patients had higher ERBB2 rates in colorectal and bladder cancers compared to White and Black patients. ERBB2 amplifications were more frequent in metastatic tumors. These findings highlight the need for personalized HER2-targeted therapies and tailored clinical trials.