MME and squamous cell lung carcinoma: Tumor cells were positive for CK-7 but negative for CK 20, TTF1, synaptophysin, HMB45, CD10, Napsin A, CDX2, CD10, and S100, thus excluding various other primaries, including gastrointestinal adenocarcinoma, renal cell carcinoma, lung squamous cell carcinoma, and PEComa.