CT.gov Condition Ancient Backlog
2026-03-29 | full-registry ct.gov audit | plots, figures, and e156 bundle
Series
IndustrySponsor-ClassPhaseStructural MissingnessEvidence VisibilityCompletion CohortCondition HiddennessSponsor ConcentrationRule-Era ReportingPublication UndercountOncology HiddennessCardiovascular HiddennessMetabolic HiddennessEnrollment-SizeGeography-ScaleDesign-PurposeCompletion-DelayTrial-ArchitectureIntervention-TypeCountry ReportingStopped-TrialOutcome-DensityActual-FieldUs-Versus-GlobalModality-SponsorCountry-ConditionDisease-GeographyCondition-SponsorCountry-SponsorUs-Versus-Ex-UsIndustry-FamilyRisk-Adjusted HiddennessOverdue Results ClockPublication Index GapProbable Act/Fdaaa DebtSponsor Excess WatchlistCountry Excess WatchlistCondition Excess WatchlistBlack-Box TrialsStrict-Proxy RepeatersSponsor Ghost RepeatersCountry Ghost WatchlistCondition Ghost WatchlistBlack-Box Sponsor RepeatersStrict-Core Black-BoxSponsor Overdue DebtCountry Overdue DebtCondition Overdue DebtNarrative-Gap RepeatersActual-Discipline RepeatersSponsor Ancient BacklogCountry Ancient BacklogCondition Ancient BacklogDescription-Black-Box RepeatersCompletion-Timing RepeatersSponsor AncientCountry AncientCondition AncientDescription Black BoxCompletion Timing
Condition Ancient-Backlog Dashboard

Condition ancient backlog shows which therapeutic CT.gov portfolios still hold the oldest unresolved studies

Oncology leads the named-family ancient backlog, OTHER remains very large on stock, cardiovascular and metabolic stay prominent, and healthy-volunteer studies are worst on large-family rate.

Open dashboardRead E156 paperProtocolSeries hub
Ancient stock
Rate
Overdue years
Conditions

Dashboard

Open dashboard at rootRead E156 micro-paperOpen protocolOpen series hub

Oncology leads the named-family ancient backlog on stock, OTHER remains huge, cardiovascular and metabolic stay prominent, and healthy-volunteer studies are the sharpest large-family rate outlier.

How to read the dashboard
Oncology stock
11,369
Ancient-backlog studies
Other stock
10,899
Ancient-backlog studies
Healthy-vol rate
31.5%
Large-family rate
Metabolic rate
27.1%
Large-family rate
Ancient backlog stock
ANCIENT STOCKTop ancient-backlog countsOncology11,369Other10,899Cardiovascular6,545Metabolic4,693Healthy volunteers4,441Infectious disease4,217Mental health3,499Musculoskeletal and pain3,390Respiratory and sleep2,250Neurology1,876
Stock shows where the oldest unresolved studies accumulate most heavily.
This is the oldest visible layer of the CT.gov reporting backlog.
Ancient backlog rate
ANCIENT RATEAncient-backlog rate among older studiesHealthy volunteers31.5%Metabolic27.1%Oncology26.8%Cardiovascular25.1%Renal and urology24.8%Respiratory and sleep24.8%Infectious disease23.4%Gastrointestinal and hepatic22.9%Reproductive and maternal22.0%Immunology and dermatology20.6%
Rate highlights a different outlier pattern from stock alone.
Smaller portfolios can look ordinary on stock but much worse on ancient-backlog rate.
Overdue years inside ancient backlog
OVERDUE YEARSDuration-weighted ancient backlogOncology174,507Other151,901Cardiovascular92,488Metabolic66,621Healthy volunteers64,993Infectious disease61,228Mental health50,587Musculoskeletal and pain47,948Respiratory and sleep32,691Neurology26,679
Duration-weighted backlog shows how long these oldest unresolved studies have been sitting silent.
That converts ancient backlog from a count into a chronic-silence duration measure.
Read Across Projects

Across The Series

Each project isolates a different dimension of registry opacity, but the point is the contrast between them, not a single leaderboard.

Industry
Industry project

Industry project from the CT.gov hiddenness series.

Sponsor-Class
Sponsor-class project

Sponsor-class project from the CT.gov hiddenness series.

Phase
Phase project

Phase project from the CT.gov hiddenness series.

Structural Missingness
Structural missingness project

Structural missingness project from the CT.gov hiddenness series.

Evidence Visibility
Evidence visibility project

Evidence visibility project from the CT.gov hiddenness series.

Completion Cohort
Completion cohort project

Completion cohort project from the CT.gov hiddenness series.

Condition Hiddenness
Condition hiddenness project

Condition hiddenness project from the CT.gov hiddenness series.

Sponsor Concentration
Sponsor concentration project

Sponsor concentration project from the CT.gov hiddenness series.

Rule-Era Reporting
Rule-era reporting project

Rule-era reporting project from the CT.gov hiddenness series.

Publication Undercount
Publication undercount audit

Publication undercount audit from the CT.gov hiddenness series.

Oncology Hiddenness
Oncology hiddenness project

Oncology hiddenness project from the CT.gov hiddenness series.

Cardiovascular Hiddenness
Cardiovascular hiddenness project

Cardiovascular hiddenness project from the CT.gov hiddenness series.

Metabolic Hiddenness
Metabolic hiddenness project

Metabolic hiddenness project from the CT.gov hiddenness series.

Enrollment-Size
Enrollment-size project

Enrollment-size project from the CT.gov hiddenness series.

Geography-Scale
Geography-scale project

Geography-scale project from the CT.gov hiddenness series.

Design-Purpose
Design-purpose project

Design-purpose project from the CT.gov hiddenness series.

Completion-Delay
Completion-delay project

Completion-delay project from the CT.gov hiddenness series.

Trial-Architecture
Trial-architecture project

Trial-architecture project from the CT.gov hiddenness series.

Intervention-Type
Intervention-type project

Intervention-type project from the CT.gov hiddenness series.

Country Reporting
Country reporting project

Country reporting project from the CT.gov hiddenness series.

Stopped-Trial
Stopped-trial project

Stopped-trial project from the CT.gov hiddenness series.

Outcome-Density
Outcome-density project

Outcome-density project from the CT.gov hiddenness series.

Actual-Field
Actual-field project

Actual-field project from the CT.gov hiddenness series.

Us-Versus-Global
US-versus-global project

US-versus-global project from the CT.gov hiddenness series.

Modality-Sponsor
Modality-sponsor project

Modality-sponsor project from the CT.gov hiddenness series.

Country-Condition
Country-condition project

Country-condition project from the CT.gov hiddenness series.

Disease-Geography
Disease-geography project

Disease-geography project from the CT.gov hiddenness series.

Condition-Sponsor
Condition-sponsor project

Condition-sponsor project from the CT.gov hiddenness series.

Country-Sponsor
Country-sponsor project

Country-sponsor project from the CT.gov hiddenness series.

Us-Versus-Ex-Us
US-versus-ex-US project

US-versus-ex-US project from the CT.gov hiddenness series.

Industry-Family
Industry-family project

Industry-family project from the CT.gov hiddenness series.

Risk-Adjusted Hiddenness
Risk-adjusted hiddenness

Risk-adjusted hiddenness from the CT.gov hiddenness series.

Overdue Results Clock
Overdue results clock

Overdue results clock from the CT.gov hiddenness series.

Publication Index Gap
Publication index gap

Publication index gap from the CT.gov hiddenness series.

Probable Act/Fdaaa Debt
Probable ACT/FDAAA debt

Probable ACT/FDAAA debt from the CT.gov hiddenness series.

Sponsor Excess Watchlist
Sponsor excess watchlist

Sponsor excess watchlist from the CT.gov hiddenness series.

Country Excess Watchlist
Country excess watchlist

Country excess watchlist from the CT.gov hiddenness series.

Condition Excess Watchlist
Condition excess watchlist

Condition excess watchlist from the CT.gov hiddenness series.

Black-Box Trials
Black-box trials

Black-box trials from the CT.gov hiddenness series.

Strict-Proxy Repeaters
Strict-proxy repeaters

Strict-proxy repeaters from the CT.gov hiddenness series.

Sponsor Ghost Repeaters
Sponsor ghost repeaters

Sponsor ghost repeaters from the CT.gov hiddenness series.

Country Ghost Watchlist
Country ghost watchlist

Country ghost watchlist from the CT.gov hiddenness series.

Condition Ghost Watchlist
Condition ghost watchlist

Condition ghost watchlist from the CT.gov hiddenness series.

Black-Box Sponsor Repeaters
Black-box sponsor repeaters

Black-box sponsor repeaters from the CT.gov hiddenness series.

Strict-Core Black-Box
Strict-core black-box

Strict-core black-box from the CT.gov hiddenness series.

Sponsor Overdue Debt
Sponsor overdue debt

Sponsor overdue debt from the CT.gov hiddenness series.

Country Overdue Debt
Country overdue debt

Country overdue debt from the CT.gov hiddenness series.

Condition Overdue Debt
Condition overdue debt

Condition overdue debt from the CT.gov hiddenness series.

Narrative-Gap Repeaters
Narrative-gap repeaters

Narrative-gap repeaters from the CT.gov hiddenness series.

Actual-Discipline Repeaters
Actual-discipline repeaters

Actual-discipline repeaters from the CT.gov hiddenness series.

Sponsor Ancient Backlog
Sponsor ancient backlog

Sponsor ancient backlog from the CT.gov hiddenness series.

Country Ancient Backlog
Country ancient backlog

Country ancient backlog from the CT.gov hiddenness series.

Description-Black-Box Repeaters
Description-black-box repeaters

Description-black-box repeaters from the CT.gov hiddenness series.

Completion-Timing Repeaters
Completion-timing repeaters

Completion-timing repeaters from the CT.gov hiddenness series.

Sponsor Ancient
CT.gov Sponsor Ancient Backlog

Named-sponsor tables showing which portfolios still hold the oldest unresolved CT.gov studies more than a decade past deadline.

Country Ancient
CT.gov Country Ancient Backlog

Country-linked tables showing where the oldest unresolved CT.gov stock still accumulates after the reporting window closed long ago.

Description Black Box
CT.gov Description-Black-Box Repeaters

Named-sponsor tables for overdue older studies that are unlinked and missing both detailed description and primary outcome description.

Completion Timing
CT.gov Completion-Timing Repeaters

Named-sponsor tables for older CT.gov studies missing actual primary completion or actual completion timing fields.

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