Fig. 1From: Tumor associated PD-L1 expression pattern in microscopically tumor positive sentinel lymph nodes in patients with melanomaExamples of sentinel lymph node melanoma sample intratumoral PD-L1 immunohistochemical staining, including positive for PD-L1 expression (brown chromogen) (a) and negative (b). The arrows point to representative areas of membranous staining interpreted as tumor cell expression. The scale bar represents 100 μmBack to article page