Cancer: what evidence wins at the Board

For cancer appeals, how often the Board granted the issue when the record held each kind of evidence, and how often when it did not. Measured from the decisions themselves; every number carries its fraction.

What this is computed from: evidence types detected in the full text of 1,907,778 public Board of Veterans' Appeals decisions (va.gov/vetapp), joined to the issue-level outcome. The tables use only single-issue decisions with a clean parse in complete crawl years (1993–2025) — 852,152 decisions — so each evidence flag attaches to exactly one decided issue. A split is shown only when both sides have at least 30 decisions. Data build: 2026-09-02.

Service connection for Cancer (n = 11,558)

When the record had…Granted, with itGranted, without itDifferenceRemanded, with it
A medical source gave a positive nexus opinionEvidence in the record66% (905/1,363)43% (2,642/6,183)+24 pts15% (249/1,614)
Private physician opinion, letter or DBQEvidence in the record58% (1,165/2,000)43% (2,382/5,546)+15 pts18% (437/2,449)
Disability Benefits Questionnaire in the recordEvidence in the record59% (195/332)46% (3,352/7,214)+12 pts28% (130/465)
Third-party lay statements (spouse, buddy, employer)Evidence in the record50% (176/349)47% (3,371/7,197)+4 pts13% (51/403)
Service treatment records document the condition or injuryEvidence in the record32% (483/1,499)51% (3,064/6,047)-18 pts20% (370/1,880)
Service treatment records silent for the conditionEvidence in the record19% (572/2,938)65% (2,975/4,608)-45 pts6% (176/3,136)
Continuity of symptoms argued (38 CFR 3.303(b))Theory argued23% (509/2,253)57% (3,038/5,293)-35 pts5% (124/2,381)
Board hearing held or testimony takenProcedure50% (1,816/3,598)44% (1,731/3,948)+7 pts25% (1,263/5,023)
Social Security records in the fileEvidence in the record12% (15/128)48% (3,532/7,418)-36 pts20% (32/162)
Medical literature or treatise citedEvidence in the record43% (1,083/2,519)49% (2,464/5,027)-6 pts25% (855/3,379)
Functional loss / DeLuca factors argued (rating cases)Theory argued22% (8/36)47% (3,539/7,510)-25 pts16% (7/45)
Presumptive service connection discussedTheory argued43% (2,796/6,438)68% (751/1,108)-24 pts18% (1,406/7,900)
Secondary service connection (38 CFR 3.310) in playTheory argued37% (745/2,035)51% (2,802/5,511)-14 pts20% (521/2,621)
Combat service / 1154(b) in playTheory argued41% (274/665)48% (3,273/6,881)-6 pts16% (129/810)
A medical source gave a negative nexus opinionEvidence in the record42% (1,318/3,132)50% (2,229/4,414)-8 pts26% (1,128/4,268)
No nexus opinion of recordEvidence in the record8% (43/548)50% (3,504/6,998)-42 pts12% (74/629)
VA examination or VA medical opinion obtainedEvidence in the record40% (1,792/4,511)58% (1,755/3,035)-18 pts32% (2,175/6,725)
Board found a VA exam or opinion inadequateHow the Board read the record41% (551/1,338)48% (2,996/6,208)-7 pts46% (1,131/2,476)
Board found the VA exam or opinion adequateHow the Board read the record22% (99/444)49% (3,448/7,102)-26 pts3% (16/460)
Board found the veteran's statements credibleHow the Board read the record73% (514/700)44% (3,033/6,846)+29 pts4% (30/732)
Board found the veteran's statements not credible or inconsistentHow the Board read the record9% (11/125)48% (3,536/7,421)-39 pts3% (4/129)
Benefit of the doubt resolved in the veteran's favorHow the Board read the record91% (1,580/1,733)34% (1,967/5,813)+57 pts1% (20/1,756)
Preponderance of the evidence against / doctrine not applicableHow the Board read the record2% (72/2,946)76% (3,475/4,600)-73 pts0% (0/2,952)
Duty-to-assist error foundHow the Board read the record49% (57/116)47% (3,490/7,430)+2 pts88% (909/1,034)
Board ordered a new exam or addendum opinionProcedure23% (142/608)49% (3,405/6,938)-26 pts78% (2,262/2,888)
AMA favorable finding acknowledgedProcedure73% (687/935)43% (2,860/6,611)+30 pts31% (428/1,365)

"Granted" = share of issues decided on the merits (granted + denied); remands and dismissals are excluded from that fraction and shown separately. Fractions are the raw counts.

Increased rating for Cancer (n = 1,282)

When the record had…Granted, with itGranted, without itDifferenceRemanded, with it
Private physician opinion, letter or DBQEvidence in the record27% (25/92)25% (176/712)+2 pts12% (12/104)
Disability Benefits Questionnaire in the recordEvidence in the record27% (20/73)25% (181/731)+3 pts43% (56/130)
Board hearing held or testimony takenProcedure34% (101/299)20% (100/505)+14 pts23% (100/436)
Functional loss / DeLuca factors argued (rating cases)Theory argued12% (4/34)26% (197/770)-14 pts13% (5/39)
Presumptive service connection discussedTheory argued31% (12/39)25% (189/765)+6 pts10% (5/49)
Secondary service connection (38 CFR 3.310) in playTheory argued22% (74/335)27% (127/469)-5 pts10% (40/381)
A medical source gave a negative nexus opinionEvidence in the record5% (2/42)26% (199/762)-21 pts25% (14/57)
VA examination or VA medical opinion obtainedEvidence in the record25% (191/769)29% (10/35)-4 pts27% (282/1,062)
Board found a VA exam or opinion inadequateHow the Board read the record28% (16/58)25% (185/746)+3 pts58% (88/152)
Board found the VA exam or opinion adequateHow the Board read the record13% (10/75)26% (191/729)-13 pts1% (1/76)
Board found the veteran's statements credibleHow the Board read the record61% (41/67)22% (160/737)+39 pts4% (3/71)
Benefit of the doubt resolved in the veteran's favorHow the Board read the record80% (57/71)20% (144/733)+61 pts1% (1/73)
Preponderance of the evidence against / doctrine not applicableHow the Board read the record7% (24/369)41% (177/435)-34 pts1% (2/371)
Board ordered a new exam or addendum opinionProcedure10% (6/62)26% (195/742)-17 pts78% (245/315)

"Granted" = share of issues decided on the merits (granted + denied); remands and dismissals are excluded from that fraction and shown separately. Fractions are the raw counts.

All Cancer issues, every benefit type (n = 15,202)

When the record had…Granted, with itGranted, without itDifferenceRemanded, with it
A medical source gave a positive nexus opinionEvidence in the record65% (937/1,433)41% (3,501/8,620)+25 pts15% (257/1,692)
Private physician opinion, letter or DBQEvidence in the record56% (1,287/2,291)41% (3,151/7,762)+16 pts17% (474/2,779)
Disability Benefits Questionnaire in the recordEvidence in the record53% (266/501)44% (4,172/9,552)+9 pts30% (214/721)
Third-party lay statements (spouse, buddy, employer)Evidence in the record50% (197/394)44% (4,241/9,659)+6 pts12% (53/450)
Service treatment records document the condition or injuryEvidence in the record32% (502/1,573)46% (3,936/8,480)-15 pts19% (381/1,968)
Service treatment records silent for the conditionEvidence in the record20% (585/2,999)55% (3,853/7,054)-35 pts6% (180/3,202)
Continuity of symptoms argued (38 CFR 3.303(b))Theory argued22% (512/2,279)51% (3,926/7,774)-28 pts5% (128/2,414)
Board hearing held or testimony takenProcedure49% (2,218/4,554)40% (2,220/5,499)+8 pts24% (1,494/6,306)
Social Security records in the fileEvidence in the record17% (32/186)45% (4,406/9,867)-27 pts17% (38/230)
Medical literature or treatise citedEvidence in the record42% (1,120/2,641)45% (3,318/7,412)-2 pts25% (903/3,549)
Functional loss / DeLuca factors argued (rating cases)Theory argued25% (25/102)44% (4,413/9,951)-20 pts15% (18/123)
Presumptive service connection discussedTheory argued43% (2,940/6,904)48% (1,498/3,149)-5 pts17% (1,449/8,420)
Secondary service connection (38 CFR 3.310) in playTheory argued35% (990/2,813)48% (3,448/7,240)-12 pts17% (599/3,488)
Combat service / 1154(b) in playTheory argued40% (299/743)44% (4,139/9,310)-4 pts16% (146/914)
A medical source gave a negative nexus opinionEvidence in the record41% (1,371/3,333)46% (3,067/6,720)-5 pts26% (1,192/4,538)
No nexus opinion of recordEvidence in the record8% (44/564)46% (4,394/9,489)-39 pts12% (81/652)
VA examination or VA medical opinion obtainedEvidence in the record39% (2,494/6,426)54% (1,944/3,627)-15 pts29% (2,699/9,198)
Board found a VA exam or opinion inadequateHow the Board read the record41% (632/1,527)45% (3,806/8,526)-3 pts46% (1,299/2,839)
Board found the VA exam or opinion adequateHow the Board read the record22% (131/597)46% (4,307/9,456)-24 pts3% (19/617)
Board found the veteran's statements credibleHow the Board read the record73% (620/850)41% (3,818/9,203)+31 pts4% (37/890)
Board found the veteran's statements not credible or inconsistentHow the Board read the record10% (15/148)45% (4,423/9,905)-35 pts3% (4/152)
Benefit of the doubt resolved in the veteran's favorHow the Board read the record90% (1,777/1,969)33% (2,661/8,084)+57 pts1% (24/1,999)
Preponderance of the evidence against / doctrine not applicableHow the Board read the record3% (131/3,811)69% (4,307/6,242)-66 pts0% (4/3,822)
Duty-to-assist error foundHow the Board read the record48% (88/182)44% (4,350/9,871)+4 pts85% (1,091/1,287)
Board ordered a new exam or addendum opinionProcedure23% (175/766)46% (4,263/9,287)-23 pts77% (2,730/3,523)
AMA favorable finding acknowledgedProcedure73% (707/975)41% (3,731/9,078)+31 pts31% (442/1,420)

"Granted" = share of issues decided on the merits (granted + denied); remands and dismissals are excluded from that fraction and shown separately. Fractions are the raw counts.

Reading these tables honestly

Association, not cause. A positive nexus opinion appears in the records of granted appeals far more often than in denied ones. That does not mean any letter wins; it means the Board grants when the evidence supports the claim, and a nexus opinion is how that support usually reaches the file.

Appeals are not claims. Every decision here is an appealed denial. Grant rates at the Board say nothing about the share of initial claims VA grants.

Findings are outcomes in disguise. Rows under "how the Board read the record" — credibility, benefit of the doubt, an inadequate exam — describe how the judge decided, not evidence to gather. They are shown because they say which arguments the Board actually reaches for.

Detection is by text pattern. Each evidence type is found by reading the decision for finding-shaped language with negation handling; precision was read on samples before publication and is stated per feature in the method notes below. Expect a few percent of misclassified rows, not zero.

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See also: all conditions · outcome rates.