Flow cytometric analysis of primary based cancer biopsy material for surface expression of SLT-R and combined Ber-EP4/M38. Also shown are results for immunohistochemical analysis of cytospins for LMWK. Expression of surface antigen in terms of percentage of cells staining positively for a marker: defined as negative or − (0% to 14%), weak or + (15% to 40%), intermediate or ++ (41% to 70%), and strong or +++ (71% to 100%).

Abbreviations: Dx, morphological diagnosis; IDC, invasive ductal carcinoma; ILC, invasive lobular carcinoma; LMWK, low molecular weight keratins detected by immunohistochemistry, expression is defined as negative (−) or positive (+) only; ND, not determined.