NUCLEAR-BODIES APPEARANCE RATE IN CANINE TESTICULAR SERTOLI-CELL TUMOR

A number of nuclear bodies (NB) were observed in the canine testicular Sertoli cell tumors (SCT). We statistically examined nineteen cases o f canine SCT concerning the NB appearance rate (NBAR), and also examin ed the NBAR in four cases of the normal testicular Sertoli cells. The mean value of the total number of the NBAR of SCT was significantly hi gher than that of normal Sertoli cells. The SCT were classified into t hree groups according to the Nielsen and Lein's histological classific ation (1974): intratubular SCT without invasion, intratubular SCT with invasion, and diffuse type SCT. The mean value of NBAR of the diffuse type SCT was significantly higher than that of the intratubular SCT w ith and without invasion, and there was no significant difference betw een the mean values of NBAR of the latter two groups. The distribution of NBAR of the diffuse type SCT was significantly different from that of the intratubular SCT with and without invasion. On the other hand, the individual differences of NBAR of the diffuse type SCT and the in tratubular SCT with invasion were significantly higher than that of th e intratubular SCT without invasion. The present study suggests that t he increase of NBAR in canine SCT might be correlated with the tumor i nvasive progression.