- Polymorphisms in the initiators of RET (rearranged during transfection) signaling pathway and susceptibility to sporadic medullary thyroid carcinoma. Cebrian, A., Lesueur, F., Martin, S., Leyland, J., Ahmed, S., Luccarini, C., Smith, P.L., Luben, R., Whittaker, J., Pharoah, P.D., Dunning, A.M., Ponder, B.A. J. Clin. Endocrinol. Metab. (2005)