Figure 1

Preoperative image and tumor biopsy images. (A) Endoscopic image taken before chemotherapy showing the tumor with a smooth surface in the lower esophagus. Histopathologically, H & E staining showed that the spindle tumor cells had no mitotic activity, as shown at × 200 (B). The tumor cells were positive for c-kit, as shown at × 200, (C) and CD34, as shown at × 200, (D) using immunohistochemistry.