Prediction of PSA bounce after permanent prostate brachytherapy for localized prostate cancer

Kunimitsu Kanai, Jun Nakashima, Akitomo Sugawara, Naoyuki Shigematsu, Hirohiko Nagata, Eiji Kikuchi, Akira Miyajima, Ken Nakagawa, Atsushi Kubo, Mototsugu Oya

研究成果: Article査読

14 被引用数 (Scopus)

抄録

Background: We aimed to calculate the frequency and features of the development of a prostate-specific antigen (PSA) bounce after prostate brachytherapy alone, to correlate the bounce with clinical and dosimetric factors and to identify factors that predict PSA bounce. Methods: PSA bounce was evaluated in 86 patients with T1-T2 prostate cancer who underwent radioactive seed implantation using iodine-125 (I-125) without hormonal therapy or external-beam radiation therapy (EBRT) from September 2004 to December 2007. A PSA bounce was defined as a rise of at least 0.4 ng/ml greater than a previous PSA level with a subsequent decline equal to, or less than, the initial nadir. Results: Calculated by the Kaplan-Meier method, the incidence of PSA bounce at a 2-year follow-up was 26%. Median time to the PSA bounce was 15 months. Univariate analysis demonstrated that age, dose received by 90% of the prostate gland (D90), volume of gland receiving 100% of the prescribed dose (V100), and V150 were significantly associated with the PSA bounce, while pretreatment PSA level, Gleason score, pretreatment prostate volume, clinical T stage, and V200 were not. In multivariate analysis, age 67 years or less and D90 more than 180 Gy were identified as independent factors for predicting the PSA bounce (P < 0.05). Conclusion: PSA bounce is not a rare phenomenon after prostate brachytherapy. It is more common in younger patients and patients receiving higher doses of radiation.

本文言語English
ページ(範囲)502-506
ページ数5
ジャーナルInternational Journal of Clinical Oncology
14
6
DOI
出版ステータスPublished - 2009 12月

ASJC Scopus subject areas

  • 外科
  • 血液学
  • 腫瘍学

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