The Neurosurgery Signal — Signal, Not Noise

Rapid review note

Journal Club is a rapid, AI-assisted appraisal layer. It highlights study design, effect estimates, and practice relevance, but it is still a briefing, not a replacement for the paper.

For education only. Not medical advice.

Paper snapshot

Rapid study overview

Open paper

DOI

10.1093/neuonc/now207

PMID

28475809

PICO

Population

All individuals in the United States diagnosed with primary brain and CNS tumors from 2009-2013

Intervention

Population-based surveillance and registry data collection

Comparator

Not applicable: descriptive epidemiology report

Outcomes

Incidence rates, mortality rates, relative survival rates by histology, age, sex, race, ethnicity

Design

Type

Descriptive epidemiology/registry analysis

Randomized

Multicenter

Yes

Blinded

Not applicable: registry data analysis

Follow-up

Survival data from 2000-2013 for malignant tumors, 2004-2013 for non-malignant tumors

Primary endpoint

Age-adjusted incidence rates per 100,000 population for primary brain and CNS tumors

Secondary endpoints

Mortality rates
Relative survival rates
Distribution by histology, age, sex, race, ethnicity

Practice impact

What this means

This CBTRUS report provides comprehensive US epidemiology data for 2009-2013, covering 368,117 primary brain and CNS tumors. It documents incidence, mortality, and survival patterns by histology and demographic factors using national registry data. Essential for understanding disease burden and planning clinical trials.

Bottom line

Provides current US epidemiology benchmarks for brain tumor incidence, mortality, and survival by histology

Strength of evidence

high

Recommendation

do not change

Why it matters

Gold-standard population-based registry data
Essential reference for neuro-oncology epidemiology
No intervention tested to change practice

What would change my mind

Major changes in tumor classification affecting comparability
Evidence of systematic data quality issues in registries
Newer comprehensive data superseding this time period

Critical appraisal

How strong is the paper?

Methods critique

Risk of bias

Low for descriptive epidemiology; uses comprehensive national registry data with quality controls

Confounding

Not applicable: descriptive report without causal inference

Missing data

2.5% of records excluded for quality reasons (invalid combinations, duplicates, errors)

Multiplicity

Multiple comparisons across subgroups; no adjustment reported

Notes

Uses 2012 CBTRUS histology grouping scheme based on ICD-O-3 codes
Combines NPCR and SEER data for comprehensive coverage

Stats check

NNT

N/A

Effect sizes

368,117 total tumor cases in final analytic dataset
361,802 cases from NPCR, 15,357 from SEER

Absolute effects

2.5% of records excluded from analysis (9,042 records)

Concerns

No comparative statistics or hypothesis testing
Descriptive rates only without confidence intervals in excerpt

External validity

Who it applies to

US population with primary brain and CNS tumors

Who it does not

Non-US populations, recurrent tumors, metastatic tumors

Generalizability notes

Represents 100% US population coverage for incidence
Survival data from 26% US population subset

Evidence trace

Source trace and metadata

Citations (3)

claim_id

methods_critique.missing_data

locator

p. 5 Results

quote

A total of 9,042 records (2.5%) were deleted from the final analytic data set

claim_id

stats_check.effect_sizes

locator

p. 5 Results

quote

The final analytic data set included 368,117 records

claim_id

practice_impact.bottom_line

locator

p. 1 Introduction

quote

to provide a comprehensive summary of the current descriptive epidemiology of primary brain and other central nervous system (CNS) tumors in the United States

Metadata

Generated at

2026-03-06T13:41:29.251Z

Version

top 100 cited in past 20 years