Table 1. Frequency of clear cell tubules (CCT) in nephrectomy specimen and association to tumor entities.
| collective | N | CCT | multiple CCT* | |
|---|---|---|---|---|
| 324 | 56/324 (17.3%) frequency | proportion of CCT | 22/56 (39.3%) of multiple CCT | |
| ccRCC | 221 | 39/221 (17.2%) | 39/56 (69.9%) | 14/22 (63.6%) |
| papillary RCC | 30 | 3/30 (10.0%) | 3/56 (5.4%) | 1/22 (4.5%) |
| chromophobe RCC | 8 | 1/8 (12.5%) | 1/56 (1.8%) | 0 |
| oncocytoma | 17 | 6/17 (35.2%) | 6/56 (10.7%) | 4/22 (18.2%) |
| other RCC subtypes | 4 | 0 | 0 | 0 |
| urothelial carcinoma | 22 | 5/22 (22.7%) | 5/56 (8.9%) | 3/22 (13.6%) |
| angiomyolipoma | 2 | 0 | 0 | 0 |
| neuroblastoma | 2 | 0 | 0 | 0 |
| other neoplasia (lymphoma, sarcoma) | 4 | 1/4 (25.0%) | 1/56 (1.8%) | 0 |
| non neoplastic kidney diseases | 14 | 1(7.1%) | 1/56 (1.8%) | 0 |
*
multiple CCT are defined as more than 10 CCT in one paraffin section of 1 cm2.
abbreviations: CCT, clear cell tubules; ccRCC, clear cell renal cell carcinoma.