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

Diandra N. Ayala-Peacock, Albert Attia, Steve E. Braunstein, Manmeet S. Ahluwalia, Jaroslaw Hepel, Caroline Chung, Joseph Contessa, Emory McTyre, Ann M. Peiffer, John T. Lucas, Scott Isom, Nicholas M. Pajewski, Rupesh Kotecha, Mark J. Stavas, Brandi Page, Lawrence R Kleinberg, Colette Shen, Robert B. Taylor, Nasarachi E. Onyeuku, Andrew T. HydeDaniel Gorovets, Samuel T. Chao, Christopher Corso, Jimmy Ruiz, Kounosuke Watabe, Stephen B. Tatter, Gelareh Zadeh, Veronica L.S. Chiang, John B. Fiveash, Michael D. Chan

Research output: Contribution to journalArticle

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 < 0.0001). We present a multi-institutionally validated prognostic model and nomogram to predict risk of DBF and guide risk-stratification of patients who are appropriate candidates for radiosurgery versus upfront WBRT.

Original languageEnglish (US)
Pages (from-to)403-411
Number of pages9
JournalJournal of Neuro-Oncology
Volume135
Issue number2
DOIs
Publication statusPublished - Nov 1 2017

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Keywords

  • Brain metastases
  • Distant brain failure
  • Multi-Institutional nomogram
  • Stereotactic radiosurgery

ASJC Scopus subject areas

  • Oncology
  • Neurology
  • Clinical Neurology
  • Cancer Research

Cite this

Ayala-Peacock, D. N., Attia, A., Braunstein, S. E., Ahluwalia, M. S., Hepel, J., Chung, C., ... Chan, M. D. (2017). Prediction of new brain metastases after radiosurgery: validation and analysis of performance of a multi-institutional nomogram. Journal of Neuro-Oncology, 135(2), 403-411. https://doi.org/10.1007/s11060-017-2588-4