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dc.contributor.authorAli, A
dc.contributor.authorHoyle, A
dc.contributor.authorHaran, ÁM
dc.contributor.authorBrawley, CD
dc.contributor.authorCook, A
dc.contributor.authorAmos, C
dc.contributor.authorCalvert, J
dc.contributor.authorDouis, H
dc.contributor.authorMason, MD
dc.contributor.authorDearnaley, D
dc.contributor.authorAttard, G
dc.contributor.authorGillessen, S
dc.contributor.authorParmar, MKB
dc.contributor.authorParker, CC
dc.contributor.authorSydes, MR
dc.contributor.authorJames, ND
dc.contributor.authorClarke, NW
dc.date.accessioned2021-03-24T11:42:36Z
dc.date.available2021-03-24T11:42:36Z
dc.date.issued2021-02-18
dc.identifier.citationJAMA oncology, 2021
dc.identifier.issn2374-2437
dc.identifier.urihttps://repository.icr.ac.uk/handle/internal/4448
dc.identifier.eissn2374-2445
dc.identifier.eissn2374-2445en_US
dc.identifier.doi10.1001/jamaoncol.2020.7857
dc.identifier.doi10.1001/jamaoncol.2020.7857en_US
dc.description.abstractImportance Prostate radiotherapy (RT) improves survival in men with low-burden metastatic prostate cancer. However, owing to the dichotomized nature of metastatic burden criteria, it is not clear how this benefit varies with bone metastasis counts and metastatic site.Objective To evaluate the association of bone metastasis count and location with survival benefit from prostate RT.Design, setting, and participants This exploratory analysis of treatment outcomes based on metastatic site and extent as determined by conventional imaging (computed tomography/magnetic resonance imaging and bone scan) evaluated patients with newly diagnosed metastatic prostate cancer randomized within the STAMPEDE trial's metastasis M1 RT comparison. The association of baseline bone metastasis counts with overall survival (OS) and failure-free survival (FFS) was assessed using a multivariable fractional polynomial interaction procedure. Further analysis was conducted in subgroups.Interventions Patients were randomized to receive either standard of care (androgen deprivation therapy with or without docetaxel) or standard of care and prostate RT.Main outcomes and measures The primary outcomes were OS and FFS.Results A total of 1939 of 2061 men were included (median [interquartile range] age, 68 [63-73] years); 1732 (89%) had bone metastases. Bone metastasis counts were associated with OS and FFS benefit from prostate RT. Survival benefit decreased continuously as the number of bone metastases increased, with benefit most pronounced up to 3 bone metastases. A plot of estimated treatment effect indicated that the upper 95% CI crossed the line of equivalence (hazard ratio [HR], 1) above 3 bone metastases without a detectable change point. Further analysis based on subgroups showed that the magnitude of benefit from the addition of prostate RT was greater in patients with low metastatic burden with only nonregional lymph nodes (M1a) or 3 or fewer bone metastases without visceral metastasis (HR for OS, 0.62; 95% CI, 0.46-0.83; HR for FFS, 0.57; 95% CI, 0.47-0.70) than among patients with 4 or more bone metastases or any visceral/other metastasis (HR for OS, 1.08; 95% CI, 0.91-1.28; interaction P = .003; HR for FFS, 0.87; 95% CI, 0.76-0.99; interaction P = .002).Conclusions and relevance In this exploratory analysis of a randomized clinical trial, bone metastasis count and metastasis location based on conventional imaging were associated with OS and FFS benefit from prostate RT in M1 disease.Trial registration ClinicalTrials.gov Identifier: NCT00268476; ISRCTN.com Identifier: ISRCTN78818544.
dc.formatPrint-Electronic
dc.languageeng
dc.language.isoeng
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleAssociation of Bone Metastatic Burden With Survival Benefit From Prostate Radiotherapy in Patients With Newly Diagnosed Metastatic Prostate Cancer: A Secondary Analysis of a Randomized Clinical Trial.
dc.typeJournal Article
dcterms.dateAccepted2020-11-06
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1001/jamaoncol.2020.7857
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by/4.0
rioxxterms.licenseref.startdate2021-02-18
rioxxterms.licenseref.startdate2021-02-18en_US
rioxxterms.typeJournal Article/Review
dc.relation.isPartOfJAMA oncology
pubs.notesNot known
pubs.organisational-group/ICR
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/ICR Divisions
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams/Clinical Academic Radiotherapy (Dearnaley)
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Radiotherapy and Imaging
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Radiotherapy and Imaging/Prostate and Bladder Cancer Research
pubs.organisational-group/ICR/Primary Group/Royal Marsden Clinical Units
pubs.organisational-group/ICR
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/ICR Divisions
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams/Clinical Academic Radiotherapy (Dearnaley)
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Radiotherapy and Imaging
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Radiotherapy and Imaging/Prostate and Bladder Cancer Research
pubs.organisational-group/ICR/Primary Group/Royal Marsden Clinical Units
pubs.publication-statusPublished
pubs.embargo.termsNot known
icr.researchteamClinical Academic Radiotherapy (Dearnaley)
icr.researchteamProstate and Bladder Cancer Research
icr.researchteamClinical Academic Radiotherapy (Dearnaley)en_US
icr.researchteamProstate and Bladder Cancer Researchen_US
dc.contributor.icrauthorJames, Nicholasen
dc.contributor.icrauthorDearnaley, Daviden
dc.contributor.icrauthorParker, Chrisen


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