Evidence map›Paper›PMID 34296000›Full record

ArticleClinical and translational radiation oncology2021

Limited-stage small cell lung cancer: Outcomes associated with prophylactic cranial irradiation over a 20-year period at the Princess Margaret Cancer Centre.

Michael Yan, Tzen S Toh, Patricia E Lindsay, Jessica Weiss, Katrina Hueniken, Christy Yeung, Vijithan Sugumar, Dixon Pinto, Tony Tadic, Alexander Sun and 8 more

Abstract read
In one paragraph

Article in Clinical and translational radiation oncology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

9 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

18 authors.

Michael YanDepartment of Oncology, Cancer Centre of Southeastern Ontario, Queen's University, Kingston, ON, Canada.
Tzen S TohThe Medical School, University of Sheffield, Sheffield, United Kingdom.
Patricia E LindsayRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Jessica WeissDepartment of Biostatistics, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Katrina HuenikenDivision of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Christy YeungDepartment of Laboratory Medicine and Pathology, University of Toronto, Toronto, ON, Canada.
Vijithan SugumarDepartment of Physiology and Pharmacology, Western University, London, ON, Canada.
Dixon PintoFaculty of Health Sciences, McMaster University, Hamilton, ON, Canada.
Tony TadicRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Alexander SunRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Andrea BezjakRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
John ChoRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Srinivas RamanRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Meredith GiulianiRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Fabio Ynoe MoraesDepartment of Oncology, Cancer Centre of Southeastern Ontario, Queen's University, Kingston, ON, Canada.
Geoffrey LiuDivision of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Andrew J HopeRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.
Benjamin H LokRadiation Medicine Program, Princess Margaret Cancer Centre, Toronto, ON, Canada.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

BACKGROUND & PURPOSE: Prophylactic cranial irradiation (PCI) is recommended for limited-stage small-cell lung cancer (LS-SCLC) patients with good response to concurrent chemoradiation. We report our institution's 20-year experience with this patient population and associated clinical outcomes. MATERIALS &

methodsA retrospective cohort of consecutive LS-SCLC patients treated with curative intent chemoradiation at our institution (1997-2018) was reviewed. Overall survival (OS) was calculated using the Kaplan-Meier method, and significant covariates determined by the Cox proportional hazards model. Covariates predictive of PCI were determined using Fisher's exact test and the Mann-Whitney test. Brain failure risk (BFR) was calculated using the cumulative incidence method treating death as a competing event. Treatment cohorts (historic vs. contemporary) were stratified by the median year of diagnosis (2005).

resultsA total of 369 patients with LS-SCLC were identified, of which 278 patients were notionally PCI eligible. PCI was given to 196 patients (71%). Younger age was associated with PCI utilization (p < 0.001). PCI utilization rates did not change between the historic and contemporary treatment era (p = 0.11), whereas magnetic resonance imaging (MRI) use at baseline and follow-up became more prevalent in the contemporary era (p = <0.001). On multivariable analysis, PCI utilization was associated with improved OS (HR 1.88, 95% CI 1.32-2.69) and decreased BFR (HR 4.66, 95% CI 2.58-8.40). Patients who had MRI follow-up had a higher incidence of BFR (HR 0.35, 95% CI 0.18-0.66) in multivariable analyses.

conclusionsFor LS-SCLC patients at our institution, PCI is more frequently utilized in younger patients, and the utilization rate did not change significantly over the past 20 years. PCI was independently associated with improved OS and lower BFR. Omission of PCI in LS-SCLC patients should not be routinely practiced in the absence of further prospective data.

Indexed as

Limited-stageProphylactic cranial irradiationSmall-cell lung cancer

Identifiers

PMID34296000
PMCPMC8282904

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.