A comparison of the biological features between prostate cancers arising in the transition and peripheral zones
Article first published online: 11 AUG 2005
Volume 96, Issue 4, pages 528–532, September 2005
How to Cite
Sakai, I., Harada, K.-I., Hara, I., Eto, H. and Miyake, H. (2005), A comparison of the biological features between prostate cancers arising in the transition and peripheral zones. BJU International, 96: 528–532. doi: 10.1111/j.1464-410X.2005.05678.x
- Issue published online: 11 AUG 2005
- Article first published online: 11 AUG 2005
- Accepted for publication 5 April 2005
- transition zone;
- peripheral zone;
- prostate cancer
To investigate differences in the biological features of prostate cancer according to the zonal origin.
PATIENTS AND METHODS
Among 172 consecutive patients who had a radical prostatectomy (RP), the study included 124 diagnosed as having either transition zone (TZ) or peripheral zone (PZ) cancer, defined according to whether there was > 70% of the cancer area in the TZ or PZ, respectively. The clinicopathological features were then compared between these groups. In addition, the RP specimens were stained immunohistochemically with antibodies to Ki-67, Bcl-2, matrix metalloproteinase-2 (MMP-2), MMP-9 and vascular endothelial growth factor (VEGF).
Twenty-four patients were diagnosed as having TZ cancer and the remaining 100 as having PZ cancer. Prostate specific antigen (PSA) values in patients with TZ cancer were significantly higher than in those with PZ cancer. Tumour volume in TZ cancer was significantly greater than that in PZ cancer, but there was no significant difference in biochemical recurrence-free survival between the groups. Immunohistochemistry showed that despite there being no differences in Bcl-2 and VEGF expression between TZ and PZ cancers, there was significantly greater expression of Ki-67, MMP-2 and MMP-9 in PZ than TZ cancers.
Despite there being no significant difference in biochemical recurrence-free survival after RP between patients with TZ and PZ cancers, there was less cell proliferation and biomarker levels related to invasive potential in TZ than in PZ cancers.