Benefits of Routine Screening for Renal Cell Carcinoma of Native Kidney in Renal Transplant Recipients

Background. Renal-cell carcinoma (RCC) is the most common solid organ cancer in kidney transplantation recipients (KTRs). Background. Analyze the incidence, prognosis, and evolution of primitive kidney RCC in KTRs at our institution.Material and Methods. Observational descriptive retrospective study in which all KTRs from January 2000 to December 2022 were included. We performed an annual abdominal ultrasound in all KTRs. Demographic and clinical data were collected. The surgical approach, location, size, histologic type, and tumor grade were analyzed. We assessed the coexistence of risk factors. We reported the appearance of tumors in other locations, changes in immunosuppressants (IS) after the diagnosis, and survival and recurrence rates observed during follow-up.Results. Eighteen RCCs of native kidneys were diagnosed with an incidence in our population of 1.08%. The majority were men (77.8%), with a mean age of 59.9 years. The pathologic analysis revealed 11 clear cell carcinomas, 6 papillary carcinomas, and 1 chromophobe cell carcinoma. The median tumor size was 2.7 cm. TNM stage was T1aN0M0 in 15 cases. Laparoscopy was performed to remove the tumor in most cases. All our patients underwent changes in IS therapy, with conversion to mammalian target of rapamycin inhibitors when possible and reduction of IS in all of them. After a mean follow-up of 78.6 months, survival was 100% without tumor recurrence. Seven of the patients were diagnosed with a new tumor in another location.Conclusion. In our experience, annual abdominal ultrasound in KTRs may be an option for the early detection of RCC in native kidneys.