Clinical trials data

Symbol Coding in cancer trials: 58 registered studies

Every registered cancer study on ClinicalTrials.gov that names Symbol Coding in an outcome measure: how often it is a primary outcome, the tests named with it, how large the studies are and when they measure it.

Registered cancer studies name it in an outcome measure: 58
Name it in a primary outcome, 47%: 27 of 58
Of the condition's 760 studies name it, against 9% of all registered studies: 8%; Other conditions
Median participants per study: 82; By phase

Try the Symbol Key Game Try Symbol Coding

Tests named in the same studies

The library tests that cancer studies naming Symbol Coding name most often beside it.

1
Verbal Learning32 studies, 15 as a primary outcome
2
Digit Span Test27 studies, 14 as a primary outcome
3
Trail Making Test27 studies, 13 as a primary outcome
4
Verbal Fluency26 studies, 13 as a primary outcome
5
Stroop Color-Word Test11 studies, 6 as a primary outcome
6
Category Fluency6 studies, 2 as a primary outcome
7
Paced Visual Serial Addition Test5 studies, 2 as a primary outcome
8
Short Story Recall5 studies, 2 as a primary outcome
9
Continuous Performance Test4 studies, 3 as a primary outcome
10
Complex Figure Copy and Recall3 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Studies by start year

Each study counted once. 2026 is partly planned starts.

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table

Registered studies by start year
Start year	Studies	A test as a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	1	0
2009	1	1
2010	1	1
2011	1	0
2012	0	0
2013	0	0
2014	5	2
2015	1	0
2016	1	0
2017	4	1
2018	2	2
2019	2	0
2020	2	1
2021	6	3
2022	6	5
2023	6	1
2024	9	3
2025	2	2
2026	7	5

Phases and study sizes

By phase

Early phase 11 studies, 1 as a primary outcome
Phase 13 studies, 0 as a primary outcome
Phase 23 studies, 1 as a primary outcome
Phase 36 studies, 2 as a primary outcome
Phase 41 studies, 1 as a primary outcome
Not applicable27 studies, 10 as a primary outcome
Observational17 studies, 12 as a primary outcome

Participants per study

Not applicable84 median, 41 to 145
Observational60 median, 40 to 100

Participants per study. The bar spans the middle half of the studies in each phase, the mark is the median, and the axis is logarithmic. Phases with fewer than 10 studies that give a size are left out.

Show as a table

Participants per cancer study that names Symbol Coding, by phase
Phase	Studies with a size	Median	Middle half
Not applicable	27	84	41 to 145
Observational	17	60	40 to 100

When cancer trials measure it

Half of the primary outcomes that name Symbol Coding are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 25 primary outcomes give a duration.

Latest time point of each outcome

Within a day5 outcomes, 2 as a primary outcome
Up to 4 weeks8 outcomes, 3 as a primary outcome
1 to 3 months14 outcomes, 7 as a primary outcome
3 to 6 months12 outcomes, 5 as a primary outcome
6 to 12 months9 outcomes, 4 as a primary outcome
1 to 2 years3 outcomes, 2 as a primary outcome
Over 2 years5 outcomes, 2 as a primary outcome
No duration given2 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

56 of the 58 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting12 studies, 8 as a primary outcome
Not yet recruiting5 studies, 3 as a primary outcome
Active, not recruiting7 studies, 3 as a primary outcome
Completed20 studies, 6 as a primary outcome
Stopped early6 studies, 2 as a primary outcome
Status unknown8 studies, 5 as a primary outcome

What they test

Behavioral22 studies, 10 as a primary outcome
Drug14 studies, 5 as a primary outcome
Device6 studies, 2 as a primary outcome
Dietary supplement2 studies, 2 as a primary outcome
Procedure1 studies, 0 as a primary outcome
Diagnostic test2 studies, 1 as a primary outcome
Radiation3 studies, 0 as a primary outcome
Other15 studies, 7 as a primary outcome
None given7 studies, 5 as a primary outcome

Intervention types as registered. A study can list several; observational studies often list none.

22 countries in all. A study with sites in several counts in each; 4 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed cancer studies that name Symbol Coding: 10 of 20, 50%

Every completed study with a cognitive outcome: 3,626 of 7,953, 46%

Completed cancer studies that name Symbol Coding and every completed study, by how they reported results
Results	Completed cancer studies that name Symbol Coding	Every completed study
Results on ClinicalTrials.gov and a paper	3, 15%	776, 10%
Results on ClinicalTrials.gov only	3, 15%	1,139, 14%
A results paper only	4, 20%	1,711, 22%
Neither	10, 50%	4,327, 54%

The 58 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.

58 studies match. 27 name Symbol Coding in a primary outcome. Median size 82 participants. Median time to the primary outcome: 6 months.

Loading 58 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts. Not shown: 1 that started before 2000.

Show as a table

Matching studies by start year
Start year	Studies	As a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	1	0
2009	1	1
2010	1	1
2011	1	0
2012	0	0
2013	0	0
2014	5	2
2015	1	0
2016	1	0
2017	4	1
2018	2	2
2019	2	0
2020	2	1
2021	6	3
2022	6	5
2023	6	1
2024	9	3
2025	2	2
2026	7	5

Library tests named most

Largest condition groups

Cancer58 studies, 27 as a primary outcome
Multiple sclerosis6 studies, 1 as a primary outcome
Mild cognitive impairment4 studies, 1 as a primary outcome
Depression and bipolar disorder3 studies, 2 as a primary outcome
Dementia and Alzheimer's2 studies, 0 as a primary outcome
Sleep and sleep disorders2 studies, 1 as a primary outcome
Pain and fatigue2 studies, 2 as a primary outcome
Stroke1 study, 0 as a primary outcome
Aging, frailty and exercise1 study, 1 as a primary outcome
Obesity and diabetes1 study, 0 as a primary outcome
Substance use and addiction1 study, 0 as a primary outcome
COVID-19 and long COVID1 study, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 6, NIH 1, other 51. Interventional 41, observational 17.

As a primary outcomeSecondary or other outcomeSymbol Coding

The studies, newest registration first

Each number opens the study's record on ClinicalTrials.gov.

Registered studies that match the filters, newest registration first, with the library tests each one names and the outcome list that names them.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07836478	Start2026	PhaseObservational	ConditionsCancer	Participants60	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal LearningSecondary5 years Symbol CodingSecondary5 years Complex Figure Copy and RecallSecondary5 years Corsi Block-Tapping TestSecondary5 years
NCT07710131	Start2026	PhaseNot applicable	ConditionsCancer	Participants36	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary Digit Span TestPrimary Symbol CodingPrimary Word Pair LearningPrimary
NCT07652476	Start2026	PhaseObservational	ConditionsCancer	Participants100	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimarysame day Stroop Color-Word TestPrimarysame day Verbal LearningPrimarysame day Verbal FluencyPrimarysame day Digit Span TestPrimarysame day Symbol CodingPrimarysame day Picture Naming TestPrimarysame day Complex Figure Copy and RecallPrimarysame day Corsi Block-Tapping TestPrimarysame day
NCT07633626	Start2026	PhaseObservational	ConditionsDepression and bipolar disorder, Cancer	Participants24	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 weeks Verbal LearningPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Symbol CodingPrimary12 weeks Symbol Scan TaskPrimary12 weeks
NCT07479927	Start2025	PhaseNot applicable	ConditionsCancer	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestPrimarysame day Verbal FluencyPrimarysame day Symbol CodingPrimarysame day Continuous Performance TestPrimarysame day Category FluencyPrimarysame day
NCT07463781	Start2026	PhaseObservational	ConditionsCancer	Participants100	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary2 years Verbal LearningPrimary2 years Verbal FluencyPrimary2 years Symbol CodingPrimary2 years Complex Figure Copy and RecallPrimary2 years
NCT07341217	Start2026	PhaseNot applicable	ConditionsCancer, Aging, frailty and exercise	Participants86	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingPrimary3 days Rapid Visual Information ProcessingPrimary3 days Size Order Memory TestPrimary3 days
NCT06937554	Start2025	PhaseObservational	ConditionsCancer	Participants30	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingPrimary3 weeks
NCT06727370	Start2024	PhaseObservational	ConditionsCancer, Lung disease	Participants200	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 months Stroop Color-Word TestPrimary12 months Verbal LearningPrimary12 months Verbal FluencyPrimary12 months Digit Span TestPrimary12 months Symbol CodingPrimary12 months Corsi Block-Tapping TestPrimary12 months
NCT06610617	Start2024	PhaseNot applicable	ConditionsCancer	Participants48	Lead sponsorOther	StatusCompleted	Library tests named Symbol CodingSecondary9 weeks
NCT06606535	Start2024	PhaseObservational	ConditionsCancer	Participants60	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestPrimary Digit Span TestPrimary Symbol CodingPrimary Short Story RecallPrimary
NCT06553235	Start2024	PhaseNot applicable	ConditionsCancer, Sleep and sleep disorders	Participants84	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary8 months Stroop Color-Word TestSecondary8 months Verbal LearningSecondary8 months Verbal FluencySecondary8 months Digit Span TestSecondary8 months Symbol CodingSecondary8 months Continuous Performance TestPrimary8 months Psychomotor Vigilance TaskSecondary8 months Paced Visual Serial Addition TestSecondary8 months
NCT06468176	Start2024	PhaseNot applicable	ConditionsCancer	Participants187	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary12 months Stroop Color-Word TestSecondary12 months Verbal LearningSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Symbol CodingSecondary12 months Task Switching TestSecondary12 months Delayed Recall ModuleSecondary12 months Recognition Memory TestSecondary12 months
NCT06330298	Start2021	PhaseNot applicable	ConditionsStroke, Multiple sclerosis, Cancer	Participants84	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestOther outcomesame day Verbal LearningOther outcomesame day Verbal FluencyOther outcomesame day Digit Span TestOther outcomesame day Symbol CodingOther outcomesame day Category FluencyOther outcomesame day Social Slips Stories TaskSecondary10 months
NCT06219902	Start2024	PhasePhase 1	ConditionsCancer	Participants64	Lead sponsorIndustry	StatusCompleted Paper	Library tests named Symbol CodingSecondarysame day
NCT06136923	Start2023	PhaseNot applicable	ConditionsMultiple sclerosis, Cancer	Participants194	Lead sponsorIndustry	StatusCompleted	Library tests named Symbol CodingSecondary4 weeks
NCT06112639	Start2024	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Multiple sclerosis, Cancer	Participants192	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Stroop Color-Word TestSecondary6 months Verbal FluencySecondary6 months Symbol CodingSecondary6 months Category FluencySecondary6 months Selective Reminding TaskSecondary6 months Delayed Recall ModuleSecondary6 months
NCT06103318	Start2024	PhaseNot applicable	ConditionsCancer	Participants176	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestPrimary12 months Verbal LearningPrimary12 months Verbal FluencyPrimary12 months Digit Span TestPrimary12 months Symbol CodingPrimary12 months
NCT06055231	Start2026	PhasePhase 1	ConditionsCancer, Substance use and addiction	Participants40	Lead sponsorOther	StatusNot yet recruiting	Library tests named Symbol CodingSecondary2 weeks Paced Visual Serial Addition TestSecondary2 weeks
NCT05907265	Start2023	PhaseNot applicable	ConditionsCancer	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 weeks Stroop Color-Word TestPrimary12 weeks Verbal LearningPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Symbol CodingPrimary12 weeks Continuous Performance TestPrimary12 weeks Vocabulary TestPrimary12 weeks
NCT05896189	Start2024	PhaseNot applicable	ConditionsCancer	Participants386	Lead sponsorOther	StatusActive, not recruiting	Library tests named Symbol CodingSecondary8 months
NCT05716542	Start2023	PhaseNot applicable	ConditionsCancer	Participants41	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary12 weeks Symbol CodingSecondary12 weeks N-Back TaskSecondary12 weeks Task Switching TestSecondary12 weeks
NCT05708716	Start2022	PhaseNot applicable	ConditionsCancer	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Symbol CodingPrimary12 weeks Short Story RecallPrimary12 weeks Letter-Number Sequencing TaskPrimary12 weeks
NCT05704855	Start2023	PhaseNot applicable	ConditionsCancer	Participants21	Lead sponsorOther	StatusCompleted Paper	Library tests named Verbal LearningSecondary8 weeks Symbol CodingSecondary8 weeks Vocabulary TestSecondary8 weeks Picture Order Memory TestSecondary8 weeks
NCT05671094	Start2023	PhaseNot applicable	ConditionsCancer	Participants21	Lead sponsorOther	StatusCompleted	Library tests named Verbal LearningSecondary13 weeks Digit Span TestSecondary13 weeks Symbol CodingSecondary13 weeks

Questions, answered from the data

How many cancer trials use Symbol Coding?

58 registered cancer studies on ClinicalTrials.gov name it in an outcome measure, 27 of them in a primary outcome: 8% of the condition's 760 studies with a cognitive outcome, against 9% of all of them. It is the 6th most named test in cancer trials.

Which tests do cancer trials use with Symbol Coding?

Verbal Learning (32 studies), the Digit Span Test (27 studies) and the Trail Making Test (27 studies).

When do cancer trials measure Symbol Coding?

Half of the primary outcomes that name Symbol Coding are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 25 primary outcomes give a duration.

How many completed cancer trials that use Symbol Coding have reported results?

10 of the 20 completed studies that name it, 50%, have reported results: 6 posted them on ClinicalTrials.gov, 7 have a results paper linked to the registry record, and 3 did both. The other 10 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

How the studies are counted

For each test family, the census runs ClinicalTrials.gov's own outcome search for the family's names and reads every study first posted by the day the family was counted. These studies were read on 10 November 2026. A study counts once on a page, however many tests it names. Counts for a test cover every version of the task under any of its names, so a page can count studies that used a commercial version.

The census adds two things to each record and changes nothing in it: which outcome list names the test (primary, then secondary, then other), and the condition groups, matched on the study's condition names and MeSH terms. A study can fall in several groups; one whose only condition is cognitive impairment or decline falls in “Cognitive impairment and decline”. Studies that name only instruments outside the library count in every total and share but are not listed.

A second read on 10 November 2026 added each study's overall status, whether results are posted, its intervention types, the countries of its sites and the time frame of the outcome that names each test. A time frame counts by the latest time point it names: “Baseline, 12 and 24 weeks” is 24 weeks, a single visit is within a day, and one that names no duration, such as “end of treatment”, is left out of the timings.

A third read on 10 November 2026 added the papers the registry links to each study: those its sponsor lists as reporting results, and those PubMed links to it through the study's NCT number. A study has a results paper when one of them came out in or after the month of its primary completion and PubMed does not class it as a protocol, review or comment. A paper that never gives the NCT number is not linked, so some studies counted as reporting neither did publish.

Source: ClinicalTrials.gov, a database of the U.S. National Library of Medicine, which does not endorse these pages. Every study line is in the data release 2.1.0, and the explorer's own file is clinical-trials-studies.json.

The census counts Symbol Key Game and Symbol Coding as one test family, so this page counts their studies together.

Run Symbol Coding in your trial

Choose tests with a record in registered trials, and run them in a browser at every site, on the same version each visit.

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Clinical trials data

Symbol Coding in cancer trials: 58 registered studies

Registered cancer studies name it in an outcome measure: 58
Name it in a primary outcome, 47%: 27 of 58
Of the condition's 760 studies name it, against 9% of all registered studies: 8%; Other conditions
Median participants per study: 82; By phase

Try the Symbol Key Game Try Symbol Coding

Tests named in the same studies

The library tests that cancer studies naming Symbol Coding name most often beside it.

1
Verbal Learning32 studies, 15 as a primary outcome
2
Digit Span Test27 studies, 14 as a primary outcome
3
Trail Making Test27 studies, 13 as a primary outcome
4
Verbal Fluency26 studies, 13 as a primary outcome
5
Stroop Color-Word Test11 studies, 6 as a primary outcome
6
Category Fluency6 studies, 2 as a primary outcome
7
Paced Visual Serial Addition Test5 studies, 2 as a primary outcome
8
Short Story Recall5 studies, 2 as a primary outcome
9
Continuous Performance Test4 studies, 3 as a primary outcome
10
Complex Figure Copy and Recall3 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Studies by start year

Each study counted once. 2026 is partly planned starts.

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table

Registered studies by start year
Start year	Studies	A test as a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	1	0
2009	1	1
2010	1	1
2011	1	0
2012	0	0
2013	0	0
2014	5	2
2015	1	0
2016	1	0
2017	4	1
2018	2	2
2019	2	0
2020	2	1
2021	6	3
2022	6	5
2023	6	1
2024	9	3
2025	2	2
2026	7	5

Phases and study sizes

By phase

Early phase 11 studies, 1 as a primary outcome
Phase 13 studies, 0 as a primary outcome
Phase 23 studies, 1 as a primary outcome
Phase 36 studies, 2 as a primary outcome
Phase 41 studies, 1 as a primary outcome
Not applicable27 studies, 10 as a primary outcome
Observational17 studies, 12 as a primary outcome

Participants per study

Not applicable84 median, 41 to 145
Observational60 median, 40 to 100

Show as a table

Participants per cancer study that names Symbol Coding, by phase
Phase	Studies with a size	Median	Middle half
Not applicable	27	84	41 to 145
Observational	17	60	40 to 100

When cancer trials measure it

Half of the primary outcomes that name Symbol Coding are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 25 primary outcomes give a duration.

Latest time point of each outcome

Within a day5 outcomes, 2 as a primary outcome
Up to 4 weeks8 outcomes, 3 as a primary outcome
1 to 3 months14 outcomes, 7 as a primary outcome
3 to 6 months12 outcomes, 5 as a primary outcome
6 to 12 months9 outcomes, 4 as a primary outcome
1 to 2 years3 outcomes, 2 as a primary outcome
Over 2 years5 outcomes, 2 as a primary outcome
No duration given2 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

56 of the 58 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting12 studies, 8 as a primary outcome
Not yet recruiting5 studies, 3 as a primary outcome
Active, not recruiting7 studies, 3 as a primary outcome
Completed20 studies, 6 as a primary outcome
Stopped early6 studies, 2 as a primary outcome
Status unknown8 studies, 5 as a primary outcome

What they test

Behavioral22 studies, 10 as a primary outcome
Drug14 studies, 5 as a primary outcome
Device6 studies, 2 as a primary outcome
Dietary supplement2 studies, 2 as a primary outcome
Procedure1 studies, 0 as a primary outcome
Diagnostic test2 studies, 1 as a primary outcome
Radiation3 studies, 0 as a primary outcome
Other15 studies, 7 as a primary outcome
None given7 studies, 5 as a primary outcome

Intervention types as registered. A study can list several; observational studies often list none.

22 countries in all. A study with sites in several counts in each; 4 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed cancer studies that name Symbol Coding: 10 of 20, 50%

Every completed study with a cognitive outcome: 3,626 of 7,953, 46%

Completed cancer studies that name Symbol Coding and every completed study, by how they reported results
Results	Completed cancer studies that name Symbol Coding	Every completed study
Results on ClinicalTrials.gov and a paper	3, 15%	776, 10%
Results on ClinicalTrials.gov only	3, 15%	1,139, 14%
A results paper only	4, 20%	1,711, 22%
Neither	10, 50%	4,327, 54%

The 58 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.

58 studies match. 27 name Symbol Coding in a primary outcome. Median size 82 participants. Median time to the primary outcome: 6 months.

Loading 58 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts. Not shown: 1 that started before 2000.

Show as a table

Matching studies by start year
Start year	Studies	As a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	1	0
2009	1	1
2010	1	1
2011	1	0
2012	0	0
2013	0	0
2014	5	2
2015	1	0
2016	1	0
2017	4	1
2018	2	2
2019	2	0
2020	2	1
2021	6	3
2022	6	5
2023	6	1
2024	9	3
2025	2	2
2026	7	5

Library tests named most

Largest condition groups

Cancer58 studies, 27 as a primary outcome
Multiple sclerosis6 studies, 1 as a primary outcome
Mild cognitive impairment4 studies, 1 as a primary outcome
Depression and bipolar disorder3 studies, 2 as a primary outcome
Dementia and Alzheimer's2 studies, 0 as a primary outcome
Sleep and sleep disorders2 studies, 1 as a primary outcome
Pain and fatigue2 studies, 2 as a primary outcome
Stroke1 study, 0 as a primary outcome
Aging, frailty and exercise1 study, 1 as a primary outcome
Obesity and diabetes1 study, 0 as a primary outcome
Substance use and addiction1 study, 0 as a primary outcome
COVID-19 and long COVID1 study, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 6, NIH 1, other 51. Interventional 41, observational 17.

As a primary outcomeSecondary or other outcomeSymbol Coding

The studies, newest registration first

Each number opens the study's record on ClinicalTrials.gov.

Registered studies that match the filters, newest registration first, with the library tests each one names and the outcome list that names them.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07836478	Start2026	PhaseObservational	ConditionsCancer	Participants60	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal LearningSecondary5 years Symbol CodingSecondary5 years Complex Figure Copy and RecallSecondary5 years Corsi Block-Tapping TestSecondary5 years
NCT07710131	Start2026	PhaseNot applicable	ConditionsCancer	Participants36	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary Digit Span TestPrimary Symbol CodingPrimary Word Pair LearningPrimary
NCT07652476	Start2026	PhaseObservational	ConditionsCancer	Participants100	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimarysame day Stroop Color-Word TestPrimarysame day Verbal LearningPrimarysame day Verbal FluencyPrimarysame day Digit Span TestPrimarysame day Symbol CodingPrimarysame day Picture Naming TestPrimarysame day Complex Figure Copy and RecallPrimarysame day Corsi Block-Tapping TestPrimarysame day
NCT07633626	Start2026	PhaseObservational	ConditionsDepression and bipolar disorder, Cancer	Participants24	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 weeks Verbal LearningPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Symbol CodingPrimary12 weeks Symbol Scan TaskPrimary12 weeks
NCT07479927	Start2025	PhaseNot applicable	ConditionsCancer	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestPrimarysame day Verbal FluencyPrimarysame day Symbol CodingPrimarysame day Continuous Performance TestPrimarysame day Category FluencyPrimarysame day
NCT07463781	Start2026	PhaseObservational	ConditionsCancer	Participants100	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary2 years Verbal LearningPrimary2 years Verbal FluencyPrimary2 years Symbol CodingPrimary2 years Complex Figure Copy and RecallPrimary2 years
NCT07341217	Start2026	PhaseNot applicable	ConditionsCancer, Aging, frailty and exercise	Participants86	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingPrimary3 days Rapid Visual Information ProcessingPrimary3 days Size Order Memory TestPrimary3 days
NCT06937554	Start2025	PhaseObservational	ConditionsCancer	Participants30	Lead sponsorOther	StatusRecruiting	Library tests named Symbol CodingPrimary3 weeks
NCT06727370	Start2024	PhaseObservational	ConditionsCancer, Lung disease	Participants200	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 months Stroop Color-Word TestPrimary12 months Verbal LearningPrimary12 months Verbal FluencyPrimary12 months Digit Span TestPrimary12 months Symbol CodingPrimary12 months Corsi Block-Tapping TestPrimary12 months
NCT06610617	Start2024	PhaseNot applicable	ConditionsCancer	Participants48	Lead sponsorOther	StatusCompleted	Library tests named Symbol CodingSecondary9 weeks
NCT06606535	Start2024	PhaseObservational	ConditionsCancer	Participants60	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestPrimary Digit Span TestPrimary Symbol CodingPrimary Short Story RecallPrimary
NCT06553235	Start2024	PhaseNot applicable	ConditionsCancer, Sleep and sleep disorders	Participants84	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary8 months Stroop Color-Word TestSecondary8 months Verbal LearningSecondary8 months Verbal FluencySecondary8 months Digit Span TestSecondary8 months Symbol CodingSecondary8 months Continuous Performance TestPrimary8 months Psychomotor Vigilance TaskSecondary8 months Paced Visual Serial Addition TestSecondary8 months
NCT06468176	Start2024	PhaseNot applicable	ConditionsCancer	Participants187	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary12 months Stroop Color-Word TestSecondary12 months Verbal LearningSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Symbol CodingSecondary12 months Task Switching TestSecondary12 months Delayed Recall ModuleSecondary12 months Recognition Memory TestSecondary12 months
NCT06330298	Start2021	PhaseNot applicable	ConditionsStroke, Multiple sclerosis, Cancer	Participants84	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestOther outcomesame day Verbal LearningOther outcomesame day Verbal FluencyOther outcomesame day Digit Span TestOther outcomesame day Symbol CodingOther outcomesame day Category FluencyOther outcomesame day Social Slips Stories TaskSecondary10 months
NCT06219902	Start2024	PhasePhase 1	ConditionsCancer	Participants64	Lead sponsorIndustry	StatusCompleted Paper	Library tests named Symbol CodingSecondarysame day
NCT06136923	Start2023	PhaseNot applicable	ConditionsMultiple sclerosis, Cancer	Participants194	Lead sponsorIndustry	StatusCompleted	Library tests named Symbol CodingSecondary4 weeks
NCT06112639	Start2024	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Multiple sclerosis, Cancer	Participants192	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Stroop Color-Word TestSecondary6 months Verbal FluencySecondary6 months Symbol CodingSecondary6 months Category FluencySecondary6 months Selective Reminding TaskSecondary6 months Delayed Recall ModuleSecondary6 months
NCT06103318	Start2024	PhaseNot applicable	ConditionsCancer	Participants176	Lead sponsorOther	StatusStatus unknown	Library tests named Trail Making TestPrimary12 months Verbal LearningPrimary12 months Verbal FluencyPrimary12 months Digit Span TestPrimary12 months Symbol CodingPrimary12 months
NCT06055231	Start2026	PhasePhase 1	ConditionsCancer, Substance use and addiction	Participants40	Lead sponsorOther	StatusNot yet recruiting	Library tests named Symbol CodingSecondary2 weeks Paced Visual Serial Addition TestSecondary2 weeks
NCT05907265	Start2023	PhaseNot applicable	ConditionsCancer	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 weeks Stroop Color-Word TestPrimary12 weeks Verbal LearningPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Symbol CodingPrimary12 weeks Continuous Performance TestPrimary12 weeks Vocabulary TestPrimary12 weeks
NCT05896189	Start2024	PhaseNot applicable	ConditionsCancer	Participants386	Lead sponsorOther	StatusActive, not recruiting	Library tests named Symbol CodingSecondary8 months
NCT05716542	Start2023	PhaseNot applicable	ConditionsCancer	Participants41	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary12 weeks Symbol CodingSecondary12 weeks N-Back TaskSecondary12 weeks Task Switching TestSecondary12 weeks
NCT05708716	Start2022	PhaseNot applicable	ConditionsCancer	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Symbol CodingPrimary12 weeks Short Story RecallPrimary12 weeks Letter-Number Sequencing TaskPrimary12 weeks
NCT05704855	Start2023	PhaseNot applicable	ConditionsCancer	Participants21	Lead sponsorOther	StatusCompleted Paper	Library tests named Verbal LearningSecondary8 weeks Symbol CodingSecondary8 weeks Vocabulary TestSecondary8 weeks Picture Order Memory TestSecondary8 weeks
NCT05671094	Start2023	PhaseNot applicable	ConditionsCancer	Participants21	Lead sponsorOther	StatusCompleted	Library tests named Verbal LearningSecondary13 weeks Digit Span TestSecondary13 weeks Symbol CodingSecondary13 weeks

Questions, answered from the data

How many cancer trials use Symbol Coding?

Which tests do cancer trials use with Symbol Coding?

Verbal Learning (32 studies), the Digit Span Test (27 studies) and the Trail Making Test (27 studies).

When do cancer trials measure Symbol Coding?

Half of the primary outcomes that name Symbol Coding are measured within 6 months of the start, and the middle half from 12 weeks to 12 months. 25 primary outcomes give a duration.

How many completed cancer trials that use Symbol Coding have reported results?

How the studies are counted

The census counts Symbol Key Game and Symbol Coding as one test family, so this page counts their studies together.

Run Symbol Coding in your trial

Choose tests with a record in registered trials, and run them in a browser at every site, on the same version each visit.

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Symbol Coding in cancer trials: 58 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When cancer trials measure it

Latest time point of each outcome

Status, results, interventions and countries

Status

What they test

Where their sites are

Reported results

The 58 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many cancer trials use Symbol Coding?

Which tests do cancer trials use with Symbol Coding?

When do cancer trials measure Symbol Coding?

How many completed cancer trials that use Symbol Coding have reported results?

More on Symbol Coding and cancer

Symbol Coding in other conditions

Other tests in cancer trials

How the studies are counted

Run Symbol Coding in your trial

Symbol Coding in cancer trials: 58 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When cancer trials measure it

Latest time point of each outcome

Status, results, interventions and countries

Status

What they test

Where their sites are

Reported results

The 58 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many cancer trials use Symbol Coding?

Which tests do cancer trials use with Symbol Coding?

When do cancer trials measure Symbol Coding?

How many completed cancer trials that use Symbol Coding have reported results?

More on Symbol Coding and cancer

Symbol Coding in other conditions

Other tests in cancer trials

How the studies are counted

Run Symbol Coding in your trial