The clinical data of 91 patients with bone metastases were reviewed. The renal cell carcinoma and prostatic carcinoma were diagnosed respectively in 53% and 47% of the patients. 48% of the patients had tumour size stage T3 and 71% had histopathological stage II (G2). 21% of the patients presented a bone pain. In patients with renal cell carcinoma, the level of serum bone alkaline phosphatase and erythrocyte sedimentation rate were correlated with the concentration of serum ferritin (respectively p = 0.008 and p = 0.055). The relationship between the histopathological grade (G) and the stage of tumour size (T), and the concentration of serum ferritin was noted. In patients with prostatic carcinoma, the relationship between general condition and the concentration of prostatic specific antigen (PSA) as well as the relationship between PSA and the intensity of bone pain were observed. Only relationship between the histopathological grade and the concentration of PSA had a statistical significance (p < 0.05).