[Prostate biopsies: how many samples and how many containers? Cost effectiveness].

Prostate biopsies remain the only way to confirm the presence of prostate cancer. Nevertheless, the ideal number of biopsies needed to establish the diagnosis is prone to controversy. The current European guidelines recommend 12 sextant biopsies. Few recommendations concerning how the biopsies should be handled have been published. In France, in order to avoid the loss of histological specimens, it was strongly recommended to transmit each core biopsy to the pathology department in an independent container. Performing a large number of biopsies means an increase in the number of containers transmitted and consequently a technical overload of the transmission network, which occurs without any financial counterpart. Since the current tarification system establishes cost allotment by activity, there is no room for an increased technical workload schedule. New approaches must be developed in order to increase productivity. The main aim of our study was to search for answers to the question whether it would be possible to use only one container per sextant irrespective of the number of biopsies performed. For this purpose, we performed various series of one, two, three, four or six biopsies from fresh total prostatectomies with an automatic prostate biopsy gun. All the biopsies were paraffin embedded after a 4% formalin fixative procedure. All the cores were measured after fixing, and on HES slides. The 48 series were as follow: 10 cases with one core, 16 cases with two cores, 13 cases with three cores, five cases with four cores and three cases with six cores. The average length of each core before inclusion varied from 11,8mm to 16,3mm. The average length on HES slides from 9,7 to 11,5mm. A significant difference was observed only for the blocks containing six biopsies (p=0.02). Inclusion of one to three cores from each sextant, did not lead to a loss of information or loss of chances for the patient.