MEIS1 and malignant peripheral nerve sheath tumor: mRNA and protein expression of MEIS1, as well as its cofactors, were demonstrated in numerous types of malignancies such as leukemia, neuroblastoma, ovarian, renal cell carcinoma, pancreatic, colorectal, gastric, skin, and lung cancers, as well as malignant peripheral nerve sheath tumors (Aksoz, Turan, Albayrak, & Kocabas, 2018).