RET/PTC (ret proto-oncogene/papillary thyroid carcinoma) rearrangements were most common (35%), followed by BRAF (15%) and RAS (8%) point mutations.     ///    "A significant negative association with (131) I dose for BRAF and RAS point mutations and a significant concave association with (131) I dose, with an inflection point at 1.6 Gy and odds ratio of 2.1, based on a linear-quadratic model for RET/PTC and PAX8/PPAR? rearrangements were found. "    ///    RET/PTC and PAX8/PPAR? chromosomal rearrangements in post-Chernobyl thyroid cancer and their association with iodine-131 radiation dose and other characteristics..     ///    "These data support the relationship between chromosomal rearrangements, but not point mutations, and (131) I exposure and point to a possible role of iodine deficiency in generation of RET/PTC rearrangements in these patients.. "