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Background/aim: Immune checkpoint inhibitors (ICIs) have revolutionized the treatment of metastatic urothelial carcinoma (mUC). However, they could be associated with immune-related adverse events (irAEs), which may be clinically significant. Identifying clinical characteristics that may be associated with a higher risk of irAEs is of great importance., Patients and Methods: We retrospectively collected data from all patients who received anti-PD1 or anti-PD-L1 for metastatic UC at our Institution from January 2017 to December 2022. Patients were dichotomized according to baseline neutrophil-to-lymphocyte ratio (NLR), systemic immune-inflammation index (SII), and platelet-to-lymphocyte ratio (PLR) values. We performed univariate and multivariate logistic regression to determine the association between baseline characteristics and the development of irAEs., Results: A total of 119 patients were identified. At a median follow-up of 29.6 months, 96 patients progressed and 82 died. Forty-five patients developed irAEs of any grade, 8 patients developed grade 3 toxicities. In the univariate analysis PS of 0 (p<0.01), baseline NLR <3.52, baseline PLR <194 (p=0.04) and baseline SII <906 (p=0.01) were significantly associated with a higher risk of developing irAEs, whereas in the multivariate analysis only PS=0 (p<0.01) and NLR <3.52 (p=0.03) maintained their correlation. Median progression-free survival (mPFS) and overall survival (mOS) were significantly longer in patients with NLR <3 (mPFS 3.8 vs. 2.6 months, p=0.01; mOS 15.3 vs. 5.6 months, p=0.002) and PS=0 (mPFS 4.8 vs. 2.1 months, p<0.001; mOS 15.3 vs. 3.8 months, p<0.001)., Conclusion: Low baseline NLR, PLR, and SII and good PS are associated with a higher risk of developing irAEs in patients treated with ICIs for mUC., (Copyright © 2024 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.)

Background/aim: Renal cell carcinoma (RCC) constitutes approximately 3% of all cancers. More than 60% of RCCs are detected incidentally; one-third of patients present with regional or distant metastases, and another 20-40% of patients develop metastases after radical nephrectomy. RCC can metastasize to any organ. In contrast, metastatic RCC (mRCC) without evidence of a primary tumor is extremely rare, with only a few reported cases., Case Report: We present a case of mRCC that initially presented with multiple liver and lymph node metastases but no primary renal lesion. An impressive response to treatment was achieved with a combination of immune checkpoint inhibitors and tyrosine kinase inhibitors. A clinical, radiological, and pathological diagnostic strategy, particularly in the context of a multidisciplinary team, are crucial for reaching a definitive diagnosis. This approach allows to select the appropriate treatment, making a huge difference for a mRCC due to its resistance to standard chemotherapy., Conclusion: There are currently no guidelines available for mRCC without primary tumor. Nevertheless, a combination of TKI and immunotherapy could be the optimal first-line treatment if systemic therapy is required., (Copyright © 2023 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.)