HOXA9 and neoplasm: Moreover, gene ontology analysis of 100 genes in 4 classes of thyroid carcinoma, including papillary thyroid carcinomas, oncocytic variants of follicular thyroid tumors, tumors of uncertain malignant potential, and follicular adenomas, revealed that Hoxa9 is 1 of the 7 genes that is differentially expressed in thyroid carcinomas and is responsible for tumor development (Jacques et al., 2013).