Figure 4From: Radiation-induced leiomyosarcoma of the oropharynxImmunohistochemistry of a tumor-biopsy. Immunohistochemical detection of a-actin, supporting the myogenic origin of the tumor (a, α-actin, 100×). The high proliferative activity is verified by MIB-1 (b, MIB-1, 100×).Back to article page