BACKGROUND: Perianal fistulas of Crohn's disease (CD) create a significant burden on patients' lives. However, the efficacy and safety of adipose-derived mesenchymal stem cell treatment are contradicting, and real-world evidence is lacking. AIMS: To examine the usability of darvadstrocel therapy in managing perianal CD. METHODS: We enrolled patients with CD and perianal fistulas in this retrospective multicenter study. The primary outcome was perianal clinical remission (defined as all treated fistulas closed) at weeks 26 and 52. Secondary outcomes were clinical response rates (≥ 1 fistulas closed), perianal activity (PDAI), patient satisfaction, and adverse events. Data were recorded at baseline and weeks 12, 26 and 52. Prediction of primary outcomes was performed by logistic regression. RESULTS: Overall, among 223 patients (male/female ratio: 0.48), perianal clinical remission was achieved in 78.2% and 62.3% until weeks 26 and 52. Baseline PDAI score (OR 0.75), number of fistulas (OR 0.28) and the number of weeks after preparation for surgery (OR 0.98) were associated with treatment failure. The clinical response rates were 84.8% and 79.8% at weeks 26 and 52. Improvement of subjective perianal symptoms was achieved in 77.8% and 78.4% of patients, respectively. Adverse events occurred in 13.5% of patients; perianal abscesses and proctalgia were the most frequently reported. CONCLUSION: Effectiveness data were higher than in clinical trials. The safety profile was reassuring, and patients' satisfaction was high. Appropriate patient selection, fistula preparation and expertise may help to achieve treatment success.

• Klíčová slova
• Crohn's disease, darvadstrocel, mesenchymal stem cell treatment, perianal disease,
• MeSH
• Crohnova nemoc * terapie   komplikace   MeSH
• dospělí MeSH
• indukce remise MeSH
• kohortové studie MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladý dospělý MeSH
• rektální píštěl * terapie   etiologie   MeSH
• retrospektivní studie MeSH
• spokojenost pacientů MeSH
• transplantace mezenchymálních kmenových buněk * metody   škodlivé účinky   MeSH
• výsledek terapie MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• multicentrická studie MeSH

Succinate dehydrogenase (SDH)-deficient renal cell carcinoma (RCC) is a rare subtype of renal neoplasm predominantly affecting younger individuals. It is characterized by germline mutations in SDHx genes, particularly type B. Histologically, SDH-deficient RCC features eosinophilic cytoplasmic cells forming solid nests or microcysts, sometimes entrapping normal tubules. We present three SDH-deficient RCC cases with overlapping morphological features with fumarate hydratase-deficient RCC and TFEB-rearranged RCC, an appearance that has not been previously described. All tumors lacked SDHB expression and harbored pathogenic SDHB mutations, with the germline nature confirmed in two cases. Metastasis developed in two patients. Our case set highlights the diagnostic challenges of molecularly defined renal tumors and expands the morphological spectrum of SDH-deficient RCC with unusual histological features. Clinically, these tumors appear to be aggressive.

• Klíčová slova
• RCC, Renal cell carcinoma, SDHB, Succinate dehydrogenase,
• MeSH
• dediferenciace buněk MeSH
• dospělí MeSH
• fumarasa nedostatek   genetika   MeSH
• karcinom z renálních buněk * genetika   patologie   MeSH
• lidé středního věku MeSH
• lidé MeSH
• nádorové biomarkery genetika   analýza   MeSH
• nádory ledvin * patologie   genetika   MeSH
• sukcinátdehydrogenasa * nedostatek   genetika   MeSH
• transkripční faktory BHLH-Zip genetika   MeSH
• zárodečné mutace MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• kazuistiky MeSH
• Názvy látek
• fumarasa MeSH
• nádorové biomarkery MeSH
• SDHB protein, human MeSH Prohlížeč
• sukcinátdehydrogenasa * MeSH
• TFEB protein, human MeSH Prohlížeč
• transkripční faktory BHLH-Zip MeSH