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For the study, published in the Nov. 12 online edition of the Journal of the American Society of Nephrology, the researchers looked at data from more than 200,000 U.S. kidney transplant candidates and recipients.
Along with finding that these patients are at increased risk for certain types of cancer, the investigators also identified clear patterns of risk associated with different types of treatment. However, the associations seen in the study do not prove cause-and-effect.
The risk of kidney and thyroid cancers was especially high when kidney failure patients were on dialysis. The risk of non-Hodgkin lymphoma, lung cancer, melanoma and certain other types of skin cancers was highest after kidney transplantation. The increased risk after a transplant is probably a result of the drugs that suppress the immune system that patients have to take to prevent rejection of the new kidney, the study authors suggested.
"Our study indicates that the needs of individuals with end-stage renal disease, in terms of cancer prevention and cancer screening, will likely differ over time," Yanik said in a news release from the American Society of Nephrology.
"Vigilance for kidney cancer and thyroid cancer may be of particular importance while these individuals are on dialysis. Extra consideration for screening for melanoma or lung cancer may be called for while taking immunosuppressant medications following a kidney transplant," she concluded.
The findings show the need to closely monitor these patients for cancer, Yanik's team said.
-- Robert Preidt
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