STAT6 and well-differentiated liposarcoma: Immunohistochemistry showed positivity for CD34 in the endothelium (diluted 1:5; clone, NU-4A1; Nichirei, Tokyo, Japan) and mouse double minute 2 homolog (MDM2) in the nucleus (diluted 1:100; clone, IF2; Invitrogen, Thermo Fisher Scientific, Osaka, Japan) (Fig. 3c,d), while it showed negativity for signal transducers and activator of transcription 6 (STAT6) (diluted 1:200; clone, YE361; Abcam, Cambridge, United Kingdom) (Fig. 3f); these findings were consistent with a diagnosis of WDLS.