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The presence of lymph node metastases and time to castration resistance predict the therapeutic effect of enzalutamide for castration-resistant prostate cancer

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Abstract

Background

Enzalutamide is effective against castration-resistant prostate cancer (CRPC). However, it is unclear which patients would benefit more from enzalutamide treatment. Here, we analyzed patients who received enzalutamide as first-line therapy for CRPC and evaluated the factors that predict treatment response and prognosis.

Methods

We retrospectively analyzed 101 patients treated with enzalutamide for CRPC at our institution. As primary endpoints we regarded the prostate-specific antigen (PSA) response rate and PSA–progression-free survival (PSA–PFS) from the start of enzalutamide treatment. Laboratory and imaging data were analyzed to predict treatment efficacy.

Results

PSA reductions of ≥ 50% and ≥ 90% were observed in 78 (77%) and 47 (47%) patients, respectively, compared with the baseline. During the follow-up period, 67 (66%) patients showed PSA progression, with a median PSA–PFS of 11 months. Moreover, 31 patients (31%) died, with a median overall survival of 64 months. On multivariate analysis, lymph node metastases at the start of enzalutamide treatment [odds ratio (OR) 0.0575, 95% confidence interval (CI) 0.0105–0.316, p = 0.0010] and time to CRPC (OR 0.177, 95% CI 0.0428–0.731, p = 0.0167] were associated with ≥ 90% PSA response. Lymph node metastases (hazard ratio [HR] 3.00, 95% CI 1.48–6.09, p = 0.0023) and time to CRPC (HR 1.84, 95% CI 1.02–3.30, p = 0.0419) were also predictors of PSA–PFS on a multivariate model.

Conclusions

Time to CRPC and lymph node metastasis were predictors of the PSA response rate and PSA–PFS.

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Data availability

Raw data were generated at Osaka University. Derived data supporting the results of this study are available upon request from the corresponding author, KH.

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Acknowledgements

We would like to thank Editage (http://www.editage.com) for English language editing.

Funding

This work was supported by the Japan Society for the Promotion of Science KAKENHI [Grant number 22K09447].

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Authors and Affiliations

Authors

Contributions

TO and KH contributed to the study conception and design. Material preparation and data collection and analysis were performed by TO, KH, YO, AY, TU, GY, ET, YI, YY, TK, AK, KF, and NN. Data analysis was performed by TO. The first draft of the manuscript was written by TO, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Koji Hatano.

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Conflict of interest

KH and NN have the following potential conflict of interest to report: receipt of Grants/research supports: Astellas Global.

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Oka, T., Hatano, K., Okuda, Y. et al. The presence of lymph node metastases and time to castration resistance predict the therapeutic effect of enzalutamide for castration-resistant prostate cancer. Int J Clin Oncol 28, 427–435 (2023). https://doi.org/10.1007/s10147-022-02288-5

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