EN
It was shown that the unification of neoplastic nomenclature could be very challenging. It was also noted that neoplastic disease is a dual disease, involving both the presence of neoplastic cells in the organism and the resulting disturbances in the functioning of the immune system. The study also follows the principle that the general markers are examined before the specific ones, especially in neoplasms of unknown origin or those suspected of endocrine secretion, such as carcinoid tumours.