Background and Objectives: Thyroid cancer (TC) and renal cell carcinoma (RCC) display more frequent co-occurrence than would be expected by chance. We investigated clinicopathological features of patients with both primary TC and primary RCC (TC/RCC) group to facilitate a greater understanding of the relationship between two cancers. Materials and Methods: A total of 53 patients who diagnosed with TC/RCC were enrolled. 13,663 TC-alone and 3279 RCC-alone patients who had undergone surgery at Samsung Medical Center between 1994 and 2014 were included as control groups. The clinicopathological characteristics of these patients were retrospectively reviewed. Results The median age at the time of TC or RCC diagnosis was 54 years in TC/RCC group and the RCC-alone group, while the patients in TC-alone group were significantly younger (47 years). The TC/RCC group showed a nearly equal sex prevalence (49% male), significantly different than the results of the TC-alone group (80% female) and RCC-alone group (71% male). A higher grade of pathologic stage (56.6% in stage 3) and greater number of patients with multifocality of thyroid tumors (45 vs. 32%), and more family history of cancer (32 vs. 0.4%) were revealed in TC/RCC group than in TC-alone group. In addition, 15.1% of patients in TC/RCC group presented with additional primary cancers such as prostate, colon, stomach, breast, and lung cancers. Conclusion: Patients in the TC/RCC group have a high rate of cancer family history, multifocality of thyroid tumors, and additional cancers. To understand this unique subset group, additional studies for environmental and genetic factors would be helpful for earlier diagnosis of combined cancers.

Purpose: This study aimed to evaluate the effects of bladder cuff method on oncological outcomes in patients who underwent radical nephroureterectomy (RNU) for upper tract urothelial carcinoma. Materials and Methods: The records of 1,095 patients treated with RNU performed at our hospital between 1994 and 2018 were retrospectively reviewed; 856 patients with no bladder tumor history were enrolled in the present study. The management of bladder cuff was divided into two categories: extravesical ligation (EL) or transvesical resection (TR). Survival was analyzed using the Kaplan-Meier method and Cox regression analyses were performed to determine which factors were associated with intravesical recurrence (IVR)–free survival (IVRFS), cancer-specific survival (CSS), and overall survival (OS). Results: The mean patient age was 64.8 years and the median follow-up was 37.7 months. Among the 865 patients, 477 (55.7%) underwent the TR and 379 (44.3%) the EL. Significantly higher IVRFS (p=0.001) and OS (p=0.013) were observed in the TR group. In multivariable analysis, IVR, CSS, and OS were independently associated with the EL. Among 379 patients treated with the EL, eight underwent remnant ureterectomy. Based on radical cystectomy–free survival, significant difference was not observed between the two groups. However, significantly higher IVRFS was observed in the TR group when the tumor was located in the renal pelvis. Conclusion Intramural complete excision of the distal ureter during RNU should be the gold standard approach compared with EL for the management of distal ureter in terms of oncological outcomes.

Background and Objectives: Thyroid cancer (TC) and renal cell carcinoma (RCC) display more frequent co-occurrence than would be expected by chance. We investigated clinicopathological features of patients with both primary TC and primary RCC (TC/RCC) group to facilitate a greater understanding of the relationship between two cancers. Materials and Methods: A total of 53 patients who diagnosed with TC/RCC were enrolled. 13,663 TC-alone and 3279 RCC-alone patients who had undergone surgery at Samsung Medical Center between 1994 and 2014 were included as control groups. The clinicopathological characteristics of these patients were retrospectively reviewed. Results The median age at the time of TC or RCC diagnosis was 54 years in TC/RCC group and the RCC-alone group, while the patients in TC-alone group were significantly younger (47 years). The TC/RCC group showed a nearly equal sex prevalence (49% male), significantly different than the results of the TC-alone group (80% female) and RCC-alone group (71% male). A higher grade of pathologic stage (56.6% in stage 3) and greater number of patients with multifocality of thyroid tumors (45 vs. 32%), and more family history of cancer (32 vs. 0.4%) were revealed in TC/RCC group than in TC-alone group. In addition, 15.1% of patients in TC/RCC group presented with additional primary cancers such as prostate, colon, stomach, breast, and lung cancers. Conclusion: Patients in the TC/RCC group have a high rate of cancer family history, multifocality of thyroid tumors, and additional cancers. To understand this unique subset group, additional studies for environmental and genetic factors would be helpful for earlier diagnosis of combined cancers.

Purpose: This study aimed to evaluate the effects of bladder cuff method on oncological outcomes in patients who underwent radical nephroureterectomy (RNU) for upper tract urothelial carcinoma. Materials and Methods: The records of 1,095 patients treated with RNU performed at our hospital between 1994 and 2018 were retrospectively reviewed; 856 patients with no bladder tumor history were enrolled in the present study. The management of bladder cuff was divided into two categories: extravesical ligation (EL) or transvesical resection (TR). Survival was analyzed using the Kaplan-Meier method and Cox regression analyses were performed to determine which factors were associated with intravesical recurrence (IVR)–free survival (IVRFS), cancer-specific survival (CSS), and overall survival (OS). Results: The mean patient age was 64.8 years and the median follow-up was 37.7 months. Among the 865 patients, 477 (55.7%) underwent the TR and 379 (44.3%) the EL. Significantly higher IVRFS (p=0.001) and OS (p=0.013) were observed in the TR group. In multivariable analysis, IVR, CSS, and OS were independently associated with the EL. Among 379 patients treated with the EL, eight underwent remnant ureterectomy. Based on radical cystectomy–free survival, significant difference was not observed between the two groups. However, significantly higher IVRFS was observed in the TR group when the tumor was located in the renal pelvis. Conclusion Intramural complete excision of the distal ureter during RNU should be the gold standard approach compared with EL for the management of distal ureter in terms of oncological outcomes.