[Multiple bilateral biopsy of the prostate]

Transrectal guided biopsy is the method of choice to detect carcinoma of the prostate. Systematic bilateral biopsies have been recently introduced in clinical practice because they provide valuable information about the local staging of the cancer and better representation of the actual Gleason grade of the whole tumor. The purpose of this study is to assess the frequency of neoplastic lesions in prostatic areas with normal structure at US and rectal examination and to identify, if possible, some criteria to be used in the selection of patients for random biopsies.

Systematic bilateral prostatic biopsies were performed in 155 patients with elevated prostate specific antigen (PSA) values, not exceeding 40 ng/mL and with suspected neoplastic unilateral lesion at rectal examination or US. All patients with bilateral or diffuse nodules were not included in this analysis. Three random biopsies for every side of the gland were performed using a 16-18 gauge tru-cut needle. A direct biopsy of the hypoechoic nodule or area was always performed. All specimens results were correlated with PSA and PSA density values obtained before biopsy.

Systematic biopsy identified cancers in 53/155 patients (34.19%). Of 53 cases, 35 (66%) had unilateral prostatic carcinoma and 18 (34%) had bilateral cancer. The final diagnosis was benign prostatic lesion in the remaining 102 patients (benign prostatic hyperplasia, nonspecific granulomatous prostatitis, chronic prostatitis). Dividing all the patients into main groups on the basis of pathologic findings (benign, unilateral and bilateral carcinoma) there was a statistically significant difference of PSA values between the 3 groups.

Our observations confirm the utility of systematic US-guided biopsies in the detection of tumors in normal appearing areas at US and transrectal examination, but the clinical utility of this approach needs further confirmation. Additional data on cancer volume, Gleason grade, capsular infiltration, lymph node metastasis and long term survival must be evaluated with large number of patients. In our experience PSA values can be used as a criterion to select the patients to submit to this technique to provide useful, preoperative information suspected prostatic malignancy.