Abstract
Expression of CD44 has been shown to correlate with the progression and prognosis of some malignant tumors. The aim of this study was to evaluate the expression of CD44 isoforms in infiltrating lobular carcinomas and analyse their potential as prognostic indicators. A panel of 39 tumors were examined for their expression of membranous and cytoplasmic CD44s, v3, v5, v6, v7 and v3-10 in the infiltrating cells, by immunohistochemical staining. The protein positive tumors showed membranous and/or cytoplasmic staining with all antibodies used except for CD44v7, which only displayed cytoplasmic staining. Cytoplasmic expression of CD44v3 (P = 0.014) and membranous expression of v6 (P = 0.039) were significantly associated with alveolar, classical/alveolar carcinomas and mucinous/alveolar carcinomas. Furthermore, in alveolar, classical/alveolar and mucinous/alveolar carcinomas, cytoplasmic staining of CD44v5 was correlated with lymph node negative patients (P = 0.048), whereas membranous v5 was correlated with lymph positive patients (P = 0.048). In classical, classical/trabecular and trabecular carcinomas expression of membranous CD44s was significantly correlated with lymph node status (P = 0.042).
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