부산대학교 도서관

Simple Summary: Localized renal cell carcinoma (RCC) has an excellent prognosis. However, once metastatic, patient prognosis declines significantly. There is a rare patient subgroup with localized RCC stage T1 with distant metastasis (M1) and no lymph node involvement (N0). In this study, the survival of patients diagnosed with clear cell RCC (ccRCC) stage T1N0M1 were evaluated in comparison to ccRCC patients stage T1 without metastases (N0M0). As expected, stage T1N0M1 ccRCC patients showed a significantly worse outcome than stage T1N0M0 patients. To further characterize tumor characteristics of stage T1N0M1 ccRCC patients, CD8+ tumor infiltrating lymphocytes (TILs) were analyzed, as it is known that a number of CD8+ TILs is associated with a worse prognosis. It could be shown that tumor specimens from stage T1N0M1 ccRCC patients harbor a substantially higher number of CD8+ TILs than specimens from stage T1N0M0 ccRCC patients, thus resembling advanced stage ccRCC. Nevertheless, long-term survival of stage T1N0M1 ccRCC patients is possible. Metastatic renal cell carcinoma (RCC) is among the most lethal urological malignancies. However, small, localized RCCs (≤7 cm, stage T1) have an excellent prognosis. There is a rare patient subgroup diagnosed with synchronous distant metastasis (T1N0M1), of which very little is known in terms of survival outcomes and underlying disease biology. Herein, we examined the long-term survival of 27 patients with clear cell RCC (ccRCC) stage T1N0M1 in comparison to 18 patients without metastases (T1N0M0). Tumor tissue was stained by immunohistochemistry for CD8+ tumor infiltrating lymphocytes (TILs). As expected, patients with stage T1N0M1 showed a significantly worse median cancer specific survival (CSS; 2.8 years) than patients with stage T1N0M0 (17.7 years; HR 0.077; 95% CI, 0.022–0.262). However, eight patients (29.6%) with ccRCC stage T1N0M1 survived over five years, and three of those patients (11.1%) survived over a decade. Some of these patients benefitted from an intensified, multimodal treatment including metastasis-directed therapy. The number of CD8+ TILs was substantially higher in stage T1N0M1 ccRCCs than in stage T1N0M0 ccRCCs, suggesting a more aggressive tumor biology. In conclusion, long-term survival is possible in patients with ccRCC stage T1N0M1, with some patients benefitting from an intensified, multimodal treatment approach. [ABSTRACT FROM AUTHOR]