Annelotte van Bommel

24 Table 1. Patient, tumor and treatment characteristics of patients included in the NABON Breast Cancer Audit (NBCA) stratified by invasive breast cancer and ductal carcinoma in situ (DCIS) (2011–2014). DCIS Invasive breast cancer (n=7,649) % a (n=49,073) % a Patient Age Below 50 990 13% 9,587 20% 50 - 65 4,323 57% 21,100 43% 65 or above 2,334 31% 18,368 37% Gender Female 7,621 100% 48,774 99% Male 28 0% 299 1% Tumor BI-RADS classification BI-RADS 0 19 0% 95 0% BI-RADS 1 - 2 230 3% 392 1% BI-RADS 3 - 5 7,127 93% 47,739 97% Unknown 273 4% 847 2% Palpable No 6,176 81% 17,057 35% Yes 1,308 17% 31,340 64% Unknown 165 2% 676 1% Multifocal No 7,044 92% 41,443 85% Yes 605 8% 7,630 16% Histology Ductal 7,164 94% 39,822 81% Lobular 0 0% 5,465 11% Combination 141 2% 1,264 3% Unknown 344 5% 2,522 5% Grade 1 1,188 16% 11,127 23% 2 2,691 35% 20,783 42% 3 3,323 43% 12,726 26% Unknown 447 6% 4,437 9% TNM-pT pTo / cTx / Unknown n.a. n.a. 2,359 5% pT1 n.a. n.a. 30,996 63% pT2 n.a. n.a. 13,644 28% pT3 n.a. n.a. 1,636 3% pT4 n.a. n.a. 438 1% TNM-pN pNx / Unknown n.a. n.a. 1,981 4% pN0 n.a. n.a. 31,193 64% pN1 n.a. n.a. 11,996 24% pN2 n.a. n.a. 2,463 5% pN3 n.a. n.a. 1,440 3%