SOX2 and neoplasm: Immunohistochemistry (IHC) revealed that the specimen was cluster of differentiation 34-positive (CD34+), Bcl-2 positive, and nuclear positivity for signal transducer and activator of transcription 6 (STAT6) and the Kiel 67 (Ki67) index was 15% in the main tumor but negative for alpha-smooth muscle actin (SMA), AE1/AE3, desmin, sex determining region Y-box 2 (SOX2), transducin-like enhancer of split 1 (TLE-1), sal-like protein 4 (SALL4), S100, and claudin 4.