RET/NTRK1 rearrangements in thyroid gland tumors of the papillary carcinoma family: correlation with clinicopathological features..     ///    "Furthermore, within the PCF, the frequency of RET/NTRK1 positivity was not influenced by the different neoplastic subtypes or the tumor versus degree of differentiation.. "    ///    "In addition, a significant association was found between RET/NTRK1 positivity and locally advanced stage of disease at presentation (pT4: P < 0.015). "    ///    "The multivariate analysis confirmed that RET/NTRK1 activation parallels an unfavorable disease presentation, which may correlate with a less favorable disease outcome. "