TCF3 also appears over-expressed inbreast tumor tissues, but when subgrouping tumors by subtypes, TCF3showed higher expression only in basal and HER2 enriched subtypes, corroboratingprevious observations of over-expression of TCF3 in ER- tumors andits association with basal-like tumors (Slyper etal., 2012; Zheng et al., 2019). The gene discussed is ERBB2; the disease is neoplasm.