Synchronous Papillary Thyroid Carcinoma and Right Colon Cancer

Multiple primary cancers (MPC) are relatively rare, but their incidence has been increasing in recent decades. This can be the result of advances in cancer diagnostic and therapeutic strategies. We present a new observation of synchronous primary thyroid and colon cancers occurring in a 55-year-old patient and we discuss, in the light of a review literature, the various environmental factors, genetic and iatrogenic involved in the appearance of a second primary cancer.