Impact of a novel biopsy instrument with a 25-mm side-notch needle on the detection of prostate cancer in transrectal biopsy

Kent Kanao, Keishi Kajikawa, Ikuo Kobayashi, Shingo Morinaga, Hiroyuki Muramatsu, Genya Nishikawa, Masahito Watanabe, Kenji Zennami, Kogenta Nakamura, Makoto Sumitomo

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: To evaluate the impact of a novel biopsy instrument that extends the length of the side-notch on the detection of prostate cancer in transrectal needle biopsy. Methods: We collaborated with a biopsy needle manufacturer and developed a novel biopsy instrument (PRIMECUT II long-notch type) with a 25-mm side-notch length and 28-mm stroke length to take longer tissue cores. The sampled core length, cancer detection rate, pain and complications of 489 patients who underwent transrectal biopsy using the long-notch needle were compared with those of 469 patients who underwent biopsy using a normal instrument with a 19-mm side-notch length and 22-mm stroke length. Results: The mean length of tissue taken by the long-notch needle was significantly longer than that of tissue taken by the normal-notch needle (16.3 vs 22.4 mm, P < 0.001). The overall cancer detection rate was 42.0% for the normal-notch needle and 51.1% for the long-notch needle (P = 0.005). In patients with a prostate volume of 20–40 mL, the cancer detection rate for the long-notch needle was especially higher than that for the normal-notch needle (74.2% vs 47.5%, P < 0.001). Multivariate analysis showed that the long-notch needle improved cancer detection significantly (odds ratio 1.702, P < 0.001). There were no differences of pain during biopsy and complication between the two groups. Conclusions: The novel biopsy instrument with a 25-mm side-notch can take longer tissue samples safely and has a significantly higher rate of prostate cancer detection in transrectal biopsy.

Original languageEnglish
Pages (from-to)746-751
Number of pages6
JournalInternational Journal of Urology
Volume25
Issue number8
DOIs
Publication statusPublished - 08-2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Urology

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