Figure 4From: c-KIT positive Gastrointestinal Stromal Tumor presenting with acute bleeding in a patient with neurofibromatosis type 1: a case reportImmunohistochemical staining for CD117 (A) and S100 protein (B). The tumour cells show strong diffuse membranous and cytoplasmic expression for CD117 and negative expression for S100 protein.Back to article page