Hepatitis C virus and risk of non-Hodgkin lymphoma: a population-based case-control study among Connecticut women.
OBJECTIVE
Previous epidemiologic studies of hepatitis C virus (HCV) infection and B-cell non-Hodgkin lymphoma (B-NHL) have yielded conflicting results, perhaps due to differences in the classification of B-NHL and the choice of non-population-based control groups that may not reflect the background population prevalence of HCV. To further investigate the link between HCV and NHL, we conducted HCV testing on serum samples of 998 women (464 cases; 534 controls) from a population-based case-control study of women in Connecticut.


METHODS
Serum samples were screened for HCV antibodies using an enzyme immunoassay; positive samples were confirmed by additional testing for HCV antibodies and for serum HCV RNA.


RESULTS
Approximately 2% (8 of 464) of cases and 1% (5 of 534) of controls tested positive for HCV. The risk of NHL associated with HCV infection appeared to be concentrated among B-cell lymphomas [odds ratio (OR) 2.0; 95% confidence interval (CI) 0.6, 8.2], particularly among follicular lymphomas (OR 4.1, 95% CI 0.8, 19.4).


CONCLUSIONS
The primary strength of this study is our use of a population-based study design, although the low prevalence of HCV among women in Connecticut resulted in wide CIs for the estimated association between HCV and B-NHL subtypes. Our study suggests that HCV may be associated with increased risk of development of B-NHL, and that this risk may vary by B-NHL subtype among women. Due to the relatively low prevalence of HCV in our study population and the scarcity of population-based epidemiological research on this subject, our study highlights the need for additional large, population-based studies of the role of HCV in the etiology of B-NHL.
Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT, USA.
Lindsay McOmber
LM
Morton
Eric A
EA
Engels
Theodore R
TR
Holford
Brian
B
Leaderer
Yawei
Y
Zhang
Shelia Hoar
SH
Zahm
Peter
P
Boyle
Bing
B
Zhang
Stuart
S
Flynn
Giovanni
G
Tallini
Patricia H
PH
Owens
Tongzhang
T
Zheng
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000914:Antibodies, Viral / Q000032:analysis; D016022:Case-Control Studies; D003237:Connecticut / Q000453:epidemiology; D005260:Female; D016174:Hepacivirus / Q000472:pathogenicity*; D006526:Hepatitis C / Q000150:complications*; D006801:Humans; D007124:Immunoenzyme Techniques; D008228:Lymphoma, Non-Hodgkin / Q000453:epidemiology / Q000209:etiology* / Q000821:virology*; D008875:Middle Aged; D016017:Odds Ratio; D016036:Seroepidemiologic Studies
D000914:Antibodies, Viral