An expandedtechnique of transrectal prostatic biopsy


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To compare diagnostic value of transrectal prostatic biopsy in obtaining
samples of tissue from different sites in patients with various
levels of prostate-specific antigen (PSA) and prostate size, we made
primary transrectal biopsy of the prostate in 486 patients. The patients
were divided into 7 groups by the number of punctures at biopsy (from
6 to 18). Among the patients with PSA under 20 ng/ml in the number
of tissue biopsy samples 18, a rise in prostatic cancer detection rate
(PCDR) was 16.6%. In PSA above 20 ng/ml, a statistically significant
maximal rise in PCDR occurred in the increase of biopsy number
from 6 to 12 (by 9.3%). The number of local cancer forms in patients
with PSA < 20 ng/ml among all the detected cases rose from 70%
(biopsy from 6 sites) to 92.3% (biopsy from 18 sites). Among the patients with
PSA < 20 ng/ml and the size of the prostate > 50 sm3, a
significant rise of PCDR increased from 20 to 33.3% in an increase
of the puncture number from 6 to 12. In the group of patients with
the same PSA level and prostate > 50 cm3 PCDR improves in biopsy
from 14, 16 and 18 sites (from 12.1 to 27.7%, 28.5 to 33.3%, respectively).
Standard biopsy is insufficient for adequate PCDR, it is necessary
to obtain samples of tissue from a large number of sites with
puncture of peripheral zone of the prostate. Transrectal biopsy of the
prostate according to the extended method improves PCDR, primarily,
in local cancer.

参考

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