Stroke as a late treatment effect of Hodgkin's Disease: a report from the Childhood Cancer Survivor Study.
OBJECTIVE
The objectives of this report are to examine the incidence of and risk factors for stroke among childhood Hodgkin's disease (HD) survivors.


METHODS
The Childhood Cancer Survivor Study is a multi-institutional cohort study of more than 5-year cancer survivors diagnosed between 1970 and 1986 and a sibling comparison group. Incidence rates of stroke among HD survivors (n = 1,926) and siblings (n = 3,846) were calculated and compared. Cox proportional hazards models were used to estimate the hazard ratios, reported as relative risks (RR), of developing stroke between HD survivors and siblings.


RESULTS
Nine siblings reported a stroke, for an incidence of 8.00 per 100,000 person-years (95% CI, 3.85 to 14.43 per 100,000 person-years). Twenty-four HD survivors reported a stroke. The incidence of late-occurring stroke among HD survivors was 83.6 per 100,000 person-years (95% CI, 54.5 to 121.7 per 100,000 person-years). The RR of stroke among HD survivors was 4.32 (95% CI, 2.01 to 9.29; P = .0002). All 24 survivors received mantle radiation exposure (median dose, 40 Gy). The incidence of late-occurring stroke among HD survivors treated with mantle radiation was 109.8 per 100,000 person-years (95% CI, 70.8 to 161.1 per 100,000 person-years). The RR of late-occurring stroke among HD survivors treated with mantle radiation was 5.62 (95% CI, 2.59 to 12.25; P < .0001).


CONCLUSIONS
Survivors of childhood HD are at increased risk of stroke. Mantle radiation exposure is strongly associated with subsequent stroke. Potential mechanisms may include carotid artery disease or cardiac valvular disease.
Bowers
Daniel C
DC
Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9063, USA. Daniel.Bowers@utsouthwestern.edu
McNeil
D Elizabeth
DE
Liu
Yan
Y
Yasui
Yutaka
Y
Stovall
Marilyn
M
Gurney
James G
JG
Hudson
Melissa M
MM
Donaldson
Sarah S
SS
Packer
Roger J
RJ
Mitby
Pauline A
PA
Kasper
Catherine E
CE
Robison
Leslie L
LL
Oeffinger
Kevin C
KC
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D003131:Combined Modality Therapy / Q000009:adverse effects*; D016001:Confidence Intervals; D005260:Female; D006689:Hodgkin Disease / Q000150:complications* / Q000175:diagnosis / Q000401:mortality / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011336:Probability; D011379:Prognosis; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D017678:Sex Distribution; D020521:Stroke / Q000453:epidemiology* / Q000209:etiology* / Q000503:physiopathology; D016019:Survival Analysis; D017741:Survivors