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Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

Prognostic value of a computer-aided diagnosis system involving bone scans among men treated with docetaxel for metastatic castration-resistant prostate cancer

Authors: Koichi Uemura, Yasuhide Miyoshi, Takashi Kawahara, Shuko Yoneyama, Yusuke Hattori, Jun-ichi Teranishi, Keiichi Kondo, Masatoshi Moriyama, Shigeo Takebayashi, Yumiko Yokomizo, Masahiro Yao, Hiroji Uemura, Kazumi Noguchi

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

The bone scan index (BSI), which is obtained using a computer-aided bone scan evaluation system, is anticipated to become an objective and quantitative clinical tool for evaluating bone metastases in prostate cancer. Here, we assessed the usefulness of the BSI as a prognostic factor in patients with metastatic castration-resistant prostate cancer (mCRPC) treated using docetaxel.

Methods

We analyzed 41 patients who received docetaxel for mCRPC. The Bonenavi system was used as the calculation program for the BSI. The utility of the BSI as a predictor of overall survival (OS) after docetaxel was evaluated. The Cox proportional hazards model was used to investigate the association between clinical variables obtained at docetaxel treatment, namely PSA, patient age, liver metastasis, local therapy, hemoglobin (Hb), lactase dehydrogenase (LDH), albumin (Alb), PSA doubling time, and BSI and OS.

Results

The median OS after docetaxel therapy was 17.7 months. Death occurred in 22 (53.7 %) patients; all deaths were caused by prostate cancer. In multivariate analysis, three factors were identified as significant independent prognostic biomarkers for OS after docetaxel; these were liver metastases (yes vs no; HR, 3.681; p = 0.026), Alb (<3.9 vs ≥3.9; HR, 3.776; p = 0.020), and BSI (>1 % vs ≤1 %; HR, 3.356; p = 0.037). We evaluated the discriminatory ability of our models including or excluding the BSI by quantifying the c-index. The BSI improved the c-index from 0.758 to 0.769 for OS after docetaxel. CRPC patients with a BSI >1 had a significantly shorter OS than patients with a BSI ≤1 (p = 0.029).

Conclusions

The BSI, liver metastases and Alb were independent prognostic factors for OS after docetaxel. The BSI might be a useful tool for risk stratification of mCRPC patients undergoing docetaxel treatment.
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Metadata
Title
Prognostic value of a computer-aided diagnosis system involving bone scans among men treated with docetaxel for metastatic castration-resistant prostate cancer
Authors
Koichi Uemura
Yasuhide Miyoshi
Takashi Kawahara
Shuko Yoneyama
Yusuke Hattori
Jun-ichi Teranishi
Keiichi Kondo
Masatoshi Moriyama
Shigeo Takebayashi
Yumiko Yokomizo
Masahiro Yao
Hiroji Uemura
Kazumi Noguchi
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2160-1

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