MCC and neoplasm: Our most salient tumor examples of MST to VP-MCC-like tumor were T#85.4, consisting of two discrete tumor nodules with the larger nodule (T#85.4.N1 ~20 mm) composed of pure VP-MCC-like tumor tissue (Figure S8A), and T#84.5R ~20 mm, composed almost entirely of VP-MCC-like tumor (Figure S9A,B).