A perfect correlation between these two assays was reported in our studies using eight thyroid cancer cell lines (five anaplastic thyroid cancer (ATC) cell lines (FRO-mBRAF) (21), KTC2, KTC3, ACT1, and 8505C), two papillary thyroid cancer (PTC) cell lines (KTC1 and TPC1), and a FTC cell line (WRO-wt BRAF) (8). Here, BRAF is linked to thyroid cancer.