Annelotte van Bommel

64 Table 1. Baseline characteristics of 15,072 invasive breast cancer patients treated with a mastectomy by reconstruction status between 2011 and 2013 in the Netherlands. Immediate reconstruction No Yes n % n % Age Below 50 2471 68% 1170 32% 50 to 65 4222 79% 1153 22% 65 or above 5836 97% 211 4% Clinical tumor stadium cTx / Unknown 752 72% 288 28% cT1 4596 79% 1248 21% cT2 5228 86% 864 14% cT3 1365 92% 125 8% cT4 595 98% 11 2% Clinical lymph node stadium cNx / Unknown 487 82% 108 18% cN0 8614 80% 2098 20% cN1 3141 91% 307 9% cN2 113 93% 9 7% cN3 181 93% 14 7% Multifocal No 9164 85% 1681 16% Yes 3372 80% 855 20% Histology Ductal 9444 82% 2025 18% Lobular 2027 88% 265 12% Combination 400 80% 103 21% Unknown 665 82% 143 18% Grade 1 1944 79% 513 21% 2 5445 84% 1065 16% 3 3779 85% 685 15% Unknown 1368 83% 273 17% Receptor groups HR positive, Her2 negative 8140 84% 1608 17% HR positive, Her2 positive 1140 80% 294 21% HR negative, Her2 positive 682 84% 135 17% Triple negative 1455 83% 292 17% Unknown 1119 84% 207 16% HR,Hormone Receptor. Percentages are rounded off, which in some cases leads to a total of above 100%.