- Ret/PTC activation does not influence clinical and pathological features of adult papillary thyroid carcinomas. Puxeddu, E., Moretti, S., Giannico, A., Martinelli, M., Marino, C., Avenia, N., Cristofani, R., Farabi, R., Reboldi, G., Ribacchi, R., Pontecorvi, A., Santeusanio, F. Eur. J. Endocrinol. (2003)