Validation of the 3-variable prognostic score (3-PS) in mCRPC patients treated with 223Radium-dichloride: a national multicenter study.

Abstract:

OBJECTIVE:Radium-223 (223Ra) has been approved for treatment in patients with metastatic castration-resistant prostatic cancer (mCRPC) and bone metastasis. This α-emitting radionuclide has a beneficial effect on pain and is also capable to increase overall survival (OS). Several studies evaluated the prognostic value of different biomarkers at baseline, such as serum values, imaging parameters or pain. To date, however, clinicians lack a validated and simple system to assess which patients will most likely benefit from 223Ra treatment. The 3-variable prognostic score (3-PS), proposed in a single-center study in 2017 classifies patients in five prognostic groups with a specific OS. This study aims to validate the 3-PS in a larger multicenter population. METHODS:Four hundred and thirty mCRPC patients treated with 223Ra from six different centers were analyzed. The 3-PS score consists of the collection of baseline hemoglobin, prostatic specific antigen and Eastern cooperative oncology group performance status and was initially applied to the whole population (total group). The score was then validated on the 338 patient's subgroup (clean group) obtained by subtracting the 92 patients enrolled for the original study of the 3-PS score. This purified group served as further validation evidence. RESULTS:Statistical analysis showed that the 3-PS score was valid on the total group as well as in the clean group as the AUC estimated (0.74) falls within the CI of the AUC calculated on the validation sample (95% CI 0.66-0.82). CONCLUSION:This study confirms the validity of the 3-PS score for mCRPC patients. This score is simple, noninvasive and affordable and can be easily used to select patients that will most probably complete 223Ra treatment. In addition, this tool provides an exact estimate of life expectancy in terms of OS.

journal_name

Ann Nucl Med

authors

Frantellizzi V,Monari F,Mascia M,Costa R,Rubini G,Spanu A,Di Rocco A,Lodi Rizzini E,Cindolo L,Licari M,Lavelli V,Nuvoli S,De Angelis C,Dionisi V,Ferrari C,De Vincentis G

doi

10.1007/s12149-020-01501-7

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

772-780

issue

10

eissn

0914-7187

issn

1864-6433

pii

10.1007/s12149-020-01501-7

journal_volume

34

pub_type

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