Increased cancer risk in kidney transplant patients in Scotland: a national registry linkage study

Area of Science:

• Nephrology
• Oncology
• Epidemiology

Background:

• Cancer significantly increases morbidity after kidney transplantation.
• Kidney transplant recipients (KTRs) have a higher risk of developing cancer.
• Understanding cancer incidence and risk factors in KTRs is crucial for improving outcomes.

Purpose of the Study:

• To determine the incidence of cancer in Scottish KTRs.
• To compare cancer incidence in KTRs to the general population.
• To identify factors associated with cancer development post-transplant.

Main Methods:

• Nationwide cohort study using Scottish Renal Registry, Scottish Cancer Registry, and hospitalization data.
• Standardized Incidence Ratios (SIRs) were calculated to compare cancer incidence with the general population.
• Cox proportional hazards models were used to identify risk factors for post-transplant cancer.

Main Results:

• Between 1997-2021, 4033 KTRs received transplants; 770 developed cancer (SIR 3.9).
• The highest SIRs were observed for non-melanomatous skin cancer, lymphoma, and kidney cancer.
• Cancer incidence was 7 times higher in KTRs under 40 compared to 3 times higher in KTRs over 60.

Conclusions:

• KTRs have an elevated cancer risk, particularly younger patients.
• Non-melanomatous skin cancers are the most frequent, even with low UV exposure.
• Targeted counseling and surveillance are essential for KTRs to improve outcomes.