Low-dose-rate brachytherapy for prostate cancer in renal transplant recipients.

PURPOSE: Prostate cancer (PCa) is the most common malignancy among men and one of the most common neoplasms affecting renal transplant recipients (RTRs). The available treatments for localized PCa among the general population (GP), surgery and external beam radiotherapy, carry a risk of damage to the transplanted kidney, the ureters, and the bladder and therefore tend to be avoided by most groups. The objective of this study was to assess the efficacy and feasibility of low-dose-rate brachytherapy (LDR-BT) for PCa in RTRs. METHODS AND MATERIALS: We carried out a retrospective review on all RTRs diagnosed of PCa who had undergone LDR-BT at our institution between 2000 and 2015. Nine patients met these criteria, but 1 did not fulfill the followup. Hence, we analyzed 8 patients. We reviewed all clinical data for PCa and graft function in these patients and compared the results with the GP. RESULTS: Mean baseline prostate-specific antigen was 6.8 ± 1.9 ng/mL. All PCa had a Gleason score of 6 and were classified as low risk according the Europe Association of Urology guidelines. Mean followup after seed implantation was 48 ± 12.8 months. All 8 patients remain free of prostate-specific antigen failure. Five-year progression-free survival, cancer-specific survival, and overall survival rates were 100%, 100%, and 62.5%. There was no specific toxicity associated with LDR-BT, and there were no acute adverse events affecting the graft. CONCLUSIONS: LDR-BT is a feasible and acceptable treatment for localized PCa in RTRs. Oncological outcomes are similar to the GP, and there is minimal toxicity to the renal graft.

[Gastric collision tumor with osseous metaplasia]. / Tumor de colisión gástrico con metaplasia osea.

Neuroendocrine cells are frequently found in gastric tumours, although they rarely make up more than one third of the total number of tumour cells. When juxtapositioning of the two kinds of tumour cells occurs a "collision tumour" is formed. These have been described to occur with varying frequency throughout the digestive tract. They are uncommon in the stomach. We describe a case, of a gastric collision tumour in which an adenocarcinoma coexisted with a carcinoide tumour and there were zones of bony metaplasia in the transition area between the two tumors. Positive CEA, VIP, beta-HCG and TSH on inmunohistochemical analysis was found.