For the study, 146,394 patients with hepatitis C and 572,293 people free from the infection were retrospectively assessed for cancer incidence. This revealed 1,359 cases of non-Hodgkin's lymphoma and 165 cases of Waldenström macroglobulinaemia.
People infected with hepatitis C were 20-30 per cent more likely to have non-Hodgkin's lymphoma than controls.
They were three times more likely to have Waldenström macroglobulinaemia.
Screening patients with hepatitis C infection for lymphoproliferative conditions could lead to early intervention, said the researchers.
JAMA 2007; 297: 2,010-7
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