OBJECTIVE
Transitional zone cancers are not accounted for when using standard prostate biopsy techniques. Using MRI/Transrectal ultrasound fusion biopsy (UroNav) can more accurately diagnose transitional zone prostate cancer. The goal of this study is to evaluate 375 patients with transitional zone only cancer found on a UroNav biopsy MRI/Transrectal ultrasound fusion biopsy over a three-year period to evaluate the clinical significance of their cancer.
METHOD
We retrospectively analyzed 1500 patients that underwent a UroNav biopsy over a 3 year period. 375 of these patients had transitional zone only cancers. The patients with transitional and peripheral zone cancer were analyzed. The PIRAD scores were evaluated and the percent cancer determined for each zone. Clinically significant cancer for each zone was also determined.
RESULTS
Of the 1500 patients with a PIRAD lesion, 25% were located in the transitional zone, 36% in the peripheral zone and 39% in both transitional and peripheral zone. Cancer was detected in 40% of transitional zone only lesions, 44% of peripheral zone only lesions and 38% combined zone lesion. Clinically significant cancer was noted in 26%, 27% and 20%, respectively, for the TZ, PZ and combined zones. Kaplan- Meier, Cox Proportional Hazards test, ANOVA and Chi- Square tests were performed. Data was analyzed using IBM SPSS version 27 and statistical significance was set at α=0.05. PIRAD breakdown for transitional zone only cancers are as follows, PIRAD 3 (52% of patients): 24% cancer, 10% clinically significant PIRAD 4 (34% of patients): 43% cancer, 30% clinically significant PIRAD 5 (14% of patients): 75% cancer, 60% clinically significant
CONCLUSIONS
The use of a UroNav biopsy has been instrumental in detecting clinically significant cancers in the transitional zone that otherwise would have been missed on a standard mapping biopsy.