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Prediction of new brain metastases after radiosurgery: validation and analysis of performance of a multi-institutional nomogram.


ABSTRACT: Stereotactic radiosurgery (SRS) without whole brain radiotherapy (WBRT) for brain metastases can avoid WBRT toxicities, but with risk of subsequent distant brain failure (DBF). Sole use of number of metastases to triage patients may be an unrefined method. Data on 1354 patients treated with SRS monotherapy from 2000 to 2013 for new brain metastases was collected across eight academic centers. The cohort was divided into training and validation datasets and a prognostic model was developed for time to DBF. We then evaluated the discrimination and calibration of the model within the validation dataset, and confirmed its performance with an independent contemporary cohort. Number of metastases (?8, HR 3.53 p?=?0.0001), minimum margin dose (HR 1.07 p?=?0.0033), and melanoma histology (HR 1.45, p?=?0.0187) were associated with DBF. A prognostic index derived from the training dataset exhibited ability to discriminate patients' DBF risk within the validation dataset (c-index?=?0.631) and Heller's explained relative risk (HERR)?=?0.173 (SE?=?0.048). Absolute number of metastases was evaluated for its ability to predict DBF in the derivation and validation datasets, and was inferior to the nomogram. A nomogram high-risk threshold yielding a 2.1-fold increased need for early WBRT was identified. Nomogram values also correlated to number of brain metastases at time of failure (r?=?0.38, p?

SUBMITTER: Ayala-Peacock DN 

PROVIDER: S-EPMC5667906 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Prediction of new brain metastases after radiosurgery: validation and analysis of performance of a multi-institutional nomogram.

Ayala-Peacock Diandra N DN   Attia Albert A   Braunstein Steve E SE   Ahluwalia Manmeet S MS   Hepel Jaroslaw J   Chung Caroline C   Contessa Joseph J   McTyre Emory E   Peiffer Ann M AM   Lucas John T JT   Isom Scott S   Pajewski Nicholas M NM   Kotecha Rupesh R   Stavas Mark J MJ   Page Brandi R BR   Kleinberg Lawrence L   Shen Colette C   Taylor Robert B RB   Onyeuku Nasarachi E NE   Hyde Andrew T AT   Gorovets Daniel D   Chao Samuel T ST   Corso Christopher C   Ruiz Jimmy J   Watabe Kounosuke K   Tatter Stephen B SB   Zadeh Gelareh G   Chiang Veronica L S VLS   Fiveash John B JB   Chan Michael D MD  

Journal of neuro-oncology 20170821 2


Stereotactic radiosurgery (SRS) without whole brain radiotherapy (WBRT) for brain metastases can avoid WBRT toxicities, but with risk of subsequent distant brain failure (DBF). Sole use of number of metastases to triage patients may be an unrefined method. Data on 1354 patients treated with SRS monotherapy from 2000 to 2013 for new brain metastases was collected across eight academic centers. The cohort was divided into training and validation datasets and a prognostic model was developed for ti  ...[more]

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