Radiotherapy in prostate cancer after kidney transplant: review of the literature and report of 6 cases.

BACKGROUND Patients who received a kidney transplant (KT) are described in literature as a group with a higher incidence of malignant neoplasms compared to the general population. Cancer development after KT has become a major issue, as a remarkable percentage of patients are diagnosed with cancer. Treatment of prostate cancer (PCa) in renal transplant recipients (RTRs) is a challenging issue that has been discussed by many authors over the years, but evidence is sparse and often includes conflicting reports. Among the therapeutic options for PCa in these patients, prostate irradiation represents a valuable alternative to surgery or other systemic therapies, as RTRs are often ineligible for these treatments. OBJECTIVE To report six cases treated at our institution between 1998 and 2017 and discuss the available literature. METHODS Patients' characteristics were reported along with biochemical status at diagnosis, type of immunosuppressive treatment, radiation therapy technique, and dose to transplanted kidney. RESULTS Overall, prostate irradiation was delivered respecting the dose constraints and patients showed good tolerance with no reports of acute or late transplanted kidney injury. CONCLUSIONS Our experience confirms that prostate radiotherapy for RTRs is feasible and effective and represents a valid option that should be considered by the multidisciplinary team.