There were 17 (35.4%) cases of RET/PTC1 and 6 (12.5%) of RET/PTC3, with no multiple rearrangements.     ///    The incidence of BRAF T1799A mutation and RET/PTC rearrangement is higher in Qingdao.     ///    Both BRAF T1799A mutation and RET/PTC rearrangement were present in 6 (12.5%) cases of non-micro PTC.     ///     To investigate the prevalence of BRAF T1799A mutation and RET/PTC rearrangement in Qingdao and detect the expression of platelet-derived growth factor B (PDGF-B) in order to investigate the correlation between gene mutation and PDGF-B.     ///    18 (37.5%) had BRAF T1799A mutations and 23(47.9%) had RET/PTC rearrangement.     ///    "[The correlation between BRAF mutations, RET/PTC rearrangements and platelet-derived growth factor B expression in papillary thyroid carcinomas].. "    ///    "The level of PDGF-B expression in BRAF T1799A positive was higher than that in the negative, and the level of PDGF-B expression in RET/PTC3 was higher than that in RET/PTC1 (P < 0.05). "