RET and medullary thyroid gland carcinoma: Although MZ-CRC1, an MTC cell line with the M918T mutation, appears to be more resistant to adefovir dipivoxil treatment compared to TT cells carrying the C634W mutation (Figure S1), it can be hypothesized that specific genes might be highly overexpressed in the RET M918T mutant but not in the C634W mutant.