Ferritin is a positive acute phase reactant. It is produced and secreted by various cells such as hepatocytes, macrophages and cancer cells. This was a retrospective study which included 46 patients with solid tumors who were tested for ferritin level in plasma. The measured value of the ferritin concentration in plasma of patients was in the range from 5.98 to 850.78 μg/L, and the average measured value was 174.62 μg/L. For the control group, we also included 46 subjects. The measured value of ferritin in the control group was in the range from 5.94 to 351.54 μg/Ll, and the average measured value was 63.17 μg/L. There is a statistically significant difference between the two groups. Our data shows that the highest level of ferritin was measured in patient with breast cancer. By many studies done until now it is shown that iron metabolism is dysregulated in cancer, and that changes occur in both intracellular and extracellular ferritin.Feritin je reaktant akutne faze. Proizvode ga i luče različite stanice, jetrene, makrofagi i neoplastične stanice. U ovoj retrospektivnoj studiji obrađeni su podaci 46 bolesnika sa solidnim tumorima kojima je određena koncentracija feritina u serumu. Koncentracija feritina kod bolesnika kretela se u rasponu od 5,98 do 850,78 g / L, a prosječna izmjerena vrijednost je 174,62 g / L. Kontrolan skupina je 46 zdravih osoba. Izmjerena vrijednost feritina u kontrolnoj skupini kretala se u rasponu 5,94 do 351,54 g / Ll, a prosječna izmjerena vrijednost je 63.17 g / L. Postoji statistički značajna razlika između dvije skupine. Naši podaci pokazuju da je najviša razina feritina izmjerena kod bolesnice s rakom dojke. Mnoge studije učinjene do sada pokazale su da postoji poremećaj metabolizma željeza kod malignih stanja, te da dolazi do promjena i unutarstaničnog i izvanstaničnog feritina
