['To investigate the relationship between partial reversed cell polarity (PRCP) and lymphatic tumor spread in invasive ductal carcinoma (IDC), not othervise specified (NOS).', 'Immunohistochemistry (EnVision method) was used to examine the expression of epithelial membrane antigen (EMA) and the reversed cell polarity in 199 cases of IDC.', 'Of the 199 cases, including five cases with micropapillary differentiation,30 cases with PRCP and 164 cases of IDC-NOS (without micropapillary differentiation and/or PRCP), lymphovascular invasion was seen in four (4/5), 13(43.3%) and 30 cases (18.3%) respectively; nodal metastasis was seen in four (4/5), 19 (63.3%) and 56 cases (34.1%) respectively. The rates of lymphovascular invasion and nodal metastasis were significantly higher in IDC with PRCP or IMPC than IDC-NOS (P = 0.00); there was however no significant difference between IDC with PRCP and IMPC for lymphovascular invasion and nodal metastasis (P = 0.18, P = 0.64).'] Are [ Invasive ductal carcinomas of breast showing partial reversed cell polarity associated with lymphatic tumor spread ]?