KIT and neoplasm: Immunohistochemically, tumor cells from the lung were positive for SMA (Figure 2A), CD163, F8, vimentin (Figure 2E), and collagen IV (Figure 2C), whereas they were negative for CD21, CD31, CD34, CD35, CD117, Bcl-2, CK7, CKlow, EMA, HMB45, desmin, myosin, s-100, and TTF-1 (Table 1).