Clinicopathologic features of succinate dehydrogenase deficiencient renal cell carcinoma

According to the WHO new renal tumor classification (2016), the clinical and pathologic characteristics, immunophenotype and molecular genetic characteristics of 2 cases of succinate dehydrogenase (SDH)-deficient renal cell carcinoma were retrospectively analyzed, and the relevant literature was reviewed. In 2 cases, there was 1 male and 1 female, the average age was 52.5 years old. The renal tumor average length was 4.2 cm. Tumor cut surface was solid, grayish yellow and soft. The tumor boundary was clear, and the cells were arranged in solid, nested, or small tubular growth. The cytoplasm was vacuolated or contained eosinophilic or light-stained flocculent substance, with a regular nucleus and no obvious nucleoli, showing low-grade nuclei. No atypical mitotic figures or necrosis were found. SDH-deficient renal cell carcinoma has a characteristic morphologic manifestation, and lack of SDHB expression in the immunophenotype. During the clinical diagnosis and treatment, the patient's condition and family genetic history should be asked for in detail, and genetic detection should be performed to confirm the diagnosis if necessary.