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Data for the risk of any solid cancer in patients with polycystic kidney disease are scarce. Therefore, we did a nationwide cohort study in Taiwan to establish the risk of cancer in patients with polycystic kidney disease without either chronic kidney disease or end-stage renal disease.

From inpatient claims of the Taiwan National Health Insurance Research Database, we included patients aged 20 years and older and diagnosed with polycystic kidney disease between January, 1998 and December, 2010, in the polycystic kidney disease cohort. Patients with a history of cancer, a history of chronic kidney disease or of end-stage renal disease (recorded from the Registry of Catastrophic Illness Patient Database) were excluded. For each patient with polycystic kidney disease, one patient aged older than 20 years with no history of polycystic kidney disease or cancer was randomly selected from the …