Invasive pleomorphic lobular carcinoma, negative for ER, PR and Her/2neu--a case report.

Pleomorphic variant of lobular carcinoma is a recently described variant of invasive lobular carcinoma. It is reported to be positive for estrogen receptors and progesterone receptors and over express Her2/neu in most cases. We present here a case of invasive variant of pleomorphic lobular carcinoma with coexisting classic and pleomorphic variants of lobular carcinoma in situ along with focal ductal carcinoma in situ. The immunohistochemical results on hormone receptors and high molecular weight cytokeratins in all the above components of the tumor are presented. The invasive tumor was negative for estrogen receptors, progesterone receptors and Her2/neu. Most foci of lobular carcinoma in situ showed morphogenic heterogeneity and a corresponding heterogeneous staining for hormone receptors. The high molecular weight cytokeratins (CK5/6 and CK 903) were non contributory in establishing diagnosis.