Carcinosarcoma of the esophagus is a rare malignant tumor with both carcino
matous and sarcomatous components. We present 3 cases of carcinosarcoma of
the esophagus and discuss the histogenesis of the tumors. We performed immu
nohistochemical studies using various antibodies: anti-cytokeratin, anti-vi
mentin, anti-smooth muscle actin, anti-p53, and MIB 1 reacting with Ki-67 n
uclear antigen.