Costimulatory molecule OX40/OX40L expression in ductal carcinoma in situ and invasive ductal carcinoma of breast. An immunohistochemistry-based pilot study

OX40 a membrane-bound member of the tumor-necrosis-factor-receptor (TNFR) superfamily plays an important role in proliferation survival and infiltration of activated T cells via binding to OX40L Recent studies indicate that OX40/OX40L system mediates the adhesion and infiltration of adult T cell leukemia (ATL) Previously we detected OX40 expression in breast carcinoma cell lines and tissues The correlation of expression of OX40 and OX40L and clinical features in breast caranogenesis however has not been well characterized The expression of OX40 and OX40L in 107 invasive ductal carcinomas (IDCa) 9 ductal carcinomas in situ (DCIS) and 31 fibroadenomas from breast tissues and its relationship with the clinical features were determined using immunohistochemistry (peroxidase-conjugated polymer method ChemMaten (TM) Envision (TM) Detection kit) The positive immunostaining rates for OX40 in IDCa DCIS and fibroadenomas from breast tissues were 85 0% 667% and 38 7% respectively showing a significant difference in OX40 expression among IDCa DCIS and fibroadenoma of breast (z=5 206 P=0 001) Increased staining intensity of OX40 was associated with TNM stages (z=2 112 P=0 017) Meanwhile a relation of OX40 expression with lymph node metastatic status in IDCa was found (P=0 041) The expression of OX4OL did not show any obvious difference among IDCa DCIS and fibroadenomas from breast tissues OX4OL expression was also not related to histopathological parameters in IDCa except for progesterone receptor (PR) being positive (P=0 005) However a high coincidental positive rate for OX40 and OX4OL was observed in biopsy samples with IDCa (P=0 017 Kappa=0 231) The present results suggest that high OX40 expression may be associated with malignant transformation, progression invasion and metastasis in breast cancer biology (C) 2010 Elsevier GmbH All rights reserved