Abstract
Multilocular cystic renal cell carcinoma has been recently excluded from clear cell renal cell carcinoma (CCRCC) category and re-designated as multilocular cystic renal neoplasm of low malignant potential (MCRNLMP) due to its uniformly good outcomes. While strict distinction between MCRNLMP from predominantly cystic CCRCC (pc-CCRCC) is being emphasized, the significance of extensive true cystic component in CCRCC has not been investigated. Herein, we analyzed 57 MCRNLMP, 69 pc-CCRCC, and 46 non-cystic CCRCC. There were no statistically significant differences between the three subtypes in age, gender, and laterality. ISUP grades were 1 (73%) or 2 (27%) for MCRNLMP; for pc-CCRCC were 1 (31%), 2 (60%), and 3 (9%); and for non-cystic CCRCC were 1 (9%), 2 (52%), 3 (26%), and 4 (13%). MCRNLMP were either pT stage 1 (91%) or 2 (9%), pT stages for pc-CCRCC were 1 (92.5%), 2 (1.5%), and 3 (6%) and for non-cystic CCRCC were 1 (58.7%), 2 (6.5%), and 3 (34.8%). None of MCRNLMP patients developed recurrences or metastases, and only 1 contralateral kidney tumor and 1 metastasis developed in pc-CCRCC. In contrast, 19 patients with non-cystic CCRCC developed metastases (5-year PFS 58%, CI 38.3-73.5%), and 1 patient died of disease. Monosomy 3...Continue Reading
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