%0 Journal Article %T Programmed Death Ligand 1 (PD-L1) Expression in Primary Angiosarcoma %A Annarosaria De Chiara %A Antonio Pizzolorusso %A Gerardo Botti %A Giosu¨¨ Scognamiglio %A Laura Marra %A Maurizio Di Bonito %A Monica Cantile %A Rossella De Cecio %J Journal of Cancer %D 2017 %I Ivyspring International Publisher %R 10.7150/jca.19060 %X Angiosarcomas are rare malignant endothelial-cell tumors of vascular or lymphatic origin, and are among the most aggressive subtypes of soft-tissue sarcomas. The prognosis is poor and treatment is challenging in many cases. PD-1/PD-L1 pathway plays a critical role in immune escape of tumor cells. Recent studies described that PD-L1 is widely expressed in various types of cancer, providing the basis for the development of PD1/PD-L1 antibodies as anti-cancer immunotherapy. Despite the well-known potential of PD-L1 as prognostic and predictive biomarker, only few studies described its IHC expression in cancer subtypes for the extreme difficulty in developing standard protocol with the different antibody clones available. %K angiosarcoma %K PD-L1 %K IHC evaluation. %U http://www.jcancer.org/v08p3166.htm