Type I cancers comprise low-grade serous, low-grade endometrioid, clear cell, mucinous cancers, and Brenner tumors and contain mutations in common oncogenes such as kirsten rat sarcoma 2 viral oncogene homolog (KRAS), B-raf proto-oncogene (BRAF), erb-b2 receptor tyrosine kinase 2 (ERBB2), catenin beta 1 (CTNNB1), phosphatase and tensin homolog (PTEN), phosphatidylinositol 3-kinase catalytic subunit alpha isoform (PIK3CA), and AT-rich interacting domain containing protein 1A (ARID1A)[4]. The gene discussed is ERBB2; the disease is cancer.