"Mammary tumors" refers to abnormal growths or lumps that develop in the breast tissue of mammals, including humans. These tumors can be benign (non-cancerous) or malignant (cancerous). Full definition
(C) Combined data for the growth of mammary tumours in Slc6a14 + / + / PyMT (WT) mice and Slc6a14 − / − / PyMT (KO) mice; data are means ± S.E.M. for all mammary glands in eight mice in each group. (biochemj.org)
A similar approach was used for the analysis of mammary tumours in MMTV / Neu - Tg female mice on Slc6a14 + / + and Slc6a14 − / − backgrounds. (biochemj.org)
PyMT - Tg (Polyoma middle T oncogene - transgenic) mice and MMTV / Neu - Tg (mouse mammary tumour virus promoter - Neu - transgenic) mice were from Jackson Laboratories. (biochemj.org)