To explore the clinical ,pathological and immunohistochemical features of carcinoma with multi-directional differentiation derived from junction of bladder and prostate .We collected clinical data and tissue samples of three typical cases of carcinoma from our hospital .Routine preparation of slides and immunohistochem-ical methods combined with clinical data and pathological changes analysis were adopted .We found that all 3 ca-ses occurred in the elderly lesions involving the bladder and prostate .Dysuria was the main common symptom .All the cases had a history of chronic inflammation in urethral and prostate gland .The following up data showed that survival time in two of them were no more than 15 months.The third patient without chemotherapy who took drugs of bicalutamide,enantone and pamidronate still was alive after 28 months.The pathological changes of these cases had the common features with diversity .They all showed the structure with nests ,papillary,solid,adenoid,single or syncytial cells .The nuclear of cancer cell was enlarged with hyperchromatic feature .The mitotic figures were easily found.The metaplasia and atypical hyperplasia of prostate were all found .The immunohistochemistry results showed positive results for HCK,LCK,p53,p63,PSA,P504S and negative for vimentin and S -100.The average proliferation index of Ki-67 was 77%.

Objective To investigate the expression of bone sialoprotein (BSP) in prostate cancer and its clinical significance. Methods Prostate cancer tissues of different pathological grades (68 cases) and benign prostatic hyperplasia tissues (22 cases) were selected. SP method was used to detect the expression of BSP. Serum total prostate-specific antigen (tPSA) levels of prostate cancer were detected by electrochemiluminescence immunoassay before the operation. Results Compared with no or low expression in the adjacent normal glandular tissues, the detectable levels of BSP were examined in most of the prostate cancer tissues. The expression rate of BSP in prostate cancer tissues was higher than that in benign prostatic hyperplasia tissues [76.47%(52/68) vs 13.64%(3/22),χ2=27.614, P<0.001]. The expression rates of BSP in well differentiated, moderately differentiated and poorly differentiated tissues according to cell differentiating degree (Gleason system) were 75.0 % (12/16), 77.5 % (31/40) and 75.0 % (9/12) respectively. There was no significant difference in various pathological grading (χ2=0.057, P=0.972). The expression rates of BSP in pathological stage pT2, pT3 and pT4 tissues were 62.16%(23/37), 95.24%(20/21) and 90.0%(9/10) respectively. A statistically significant association was found between BSP expression and pathological stage (χ2=9.338, P=0.009). Serum tPSA level of prostate cancer group with BSP expression was higher than that with no BSP expression [(69.06±25.52)μg/L vs (38.00±21.64)μg/L, F=19.355, P<0.001]. Conclusion The high expression of BSP in prostate cancer has a relationship with pathological stage and serum tPSA level, it may play an important role in the biological behaviour of prostate cancer.