ESRRB and neoplasm: It is of note that all the ERRB2-overexpressing cell lines were sensitive: breast (SK-BR-3, SUM190) and ovarian cell lines (TOV-112D, see Table 2), the murine TgNeu27 “primary” cell line derived from a MMTV-ErbB2/neu tumor and the L226 “primary” cell line derived from a patient with inflammatory breast carcinoma.