PROX1 and thyroid gland follicular carcinoma: We chose the CGTH-W-1 cell line, derived from a sternal metastasis of follicular thyroid carcinoma, because it expresses the highest PROX1 levels among the three previously tested cell lines: FTC-133, ML-1 and CGTH-W-1 (PROX1 expression in CGHT cells is about 2-fold higher than in FTC-133 cells) [37].