advised. 1 There are no current guidelines for the screening of other cancers. We report 5 patients with asymptomatic renal cancer discovered among our HTR cohort. First, incidental renal cancers were found between 2006 and 2009 in 2 patients who underwent abdominal computed tomography for other purposes (Patients 1 and 2, Table 1). This led us to perform routine abdominal ultrasound imaging in all our HTRs at more than 3 years after transplant, from October 2009 to October 2010. Of 96 patients, 93 provided informed consent and underwent screening. Median time after transplantation was 12 years (range, 4 –25 years). Fifty-five patients had a history of smoking, 78 had hypertension, 8 required renal dialysis, and 43 had a creatinine clearance 60 ml/min, without dialysis. Among these 93 patients, we found renal cancer in 3 additional patients and 2 patients with an atypical renal cyst that required follow-up. The renal tumor was ablated in 5 patients and was found to be clear cell carcinoma in 2, papillary in 2, and chromophobe cell in 1 (Table 1). All were T1 stage disease. Time to transplant was 15 years or more in 4 of these patients. One of the patients with renal cancer died 10 months later from a primary lung cancer. None had renal cancer relapse, with a follow-up ranging from 8 months to 4 years. This prevalence of asymptomatic renal cancer in HTR is far higher than expected in the general population. For instance, across Europe, the incidence of renal carcinoma among men ranges from 2.09/100,000 to 15.2/100,000. 2 The relative incidence of malignancy as a cause of death in patients surviving more than 10 years was 27% in our cohort (9 of 33 deaths), an incidence not statistically different from that previously reported in International Society for Heart and Lung Transplantation registry (23% of 3952 deaths, p 0.7). 3 We think that the high prevalence of renal cancer in these patients is best explained by a long mean time from transplant resulting in prolonged exposure to usual risk factors of renal cancer such as immunosuppressive therapy, hypertension, and renal failure. 2 Finally, our study suggests that routine abdominal echography for renal cancer screening could be useful in the very long-term care of these patients. However, we need to demonstrate that the benefits of this screening outweigh harm. First, echography may result in cancer over-diagnosis if the tumor growth is too slow to cause symptoms before the patient dies of another cause. 4,5 Second, this screening may lead to unnecessary and dangerous surgical interventions or biopsies. 4 Indeed, renal biopsy resulted in a hematoma in 1 patient of our series without carcinoma, prolonging hospitalization. Thus, further studies are needed to determine more accurately define the benefit/risk ratio of such screening.