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Table 1 Baseline characteristics

From: Better survival after breast-conserving therapy compared to mastectomy when axillary node status is positive in early-stage breast cancer: a registry-based follow-up study of 6387 Norwegian women participating in screening, primarily operated between 1998 and 2009

  First screening Later screening Interval cancer Total
Number 1 251 (20%) Number 3 849 (60%) Number 1 287 (20%) Number 6 387 (100%)
Median follow-up time 8.5 years Median follow-up time 5.6 years Median follow-up time 5.6 years Median follow-up time 6.0 years
Number (proportion) Proportion
undergoing BCT
Number (proportion) Proportion
undergoing BCT
Number (proportion) Proportion undergoing BCT Number (proportion) Proportion undergoing BCT
BCT 858 69% 2 844 74% 747 58% 4 449 70%
Median size of tumor 14.2 mm 13.5 mm 18.9 mm 14.7 mm
 BCT 13.3 mm 12.5 mm 16.9 mm 13.4 mm
 MTX 16.1 mm 16.2 mm 21.7 mm 17.7 mm
Stages
 T1N0M0 983 (72%) 71% 2 868 (75%) 80% 637 (49%) 70% 4 408 (69%) 76%
 T2N0M0 102 (8%) 53% 323 (8%) 51% 282 (22%) 46% 707 (11%) 50%
 T1N1M0 176 (14%) 73% 476 (12%) 65% 205 (16%) 55% 857 (13%) 64%
 T2N1M0 70 (6%) 50% 182 (5%) 48% 163 (3%) 36% 415 (7%) 44%
Tumor status
 T1 1 079 (86%) 71% 3 344 (87%) 77% 842 (65%) 66% 5 265 (82%) 74%
 T2 172 (14%) 52% 505 (13%) 50% 445 (35%) 43% 1 122 (18%) 47%
Nodal status
 Negative 1 005 (80%) 69% 3 191 (83%) 77% 919 (71%) 63% 5 115 (80%) 73%
 1 node positive 156 (12%) 68% 469 (12%) 65% 219 (17%) 54% 844 (13%) 63%
 2 nodes positive 63 (5%) 67% 127 (3%) 52% 87 (7%) 39% 277 (4%) 51%
 3 nodes positive 27 (2%) 56% 62 (2%) 44% 62 (5%) 31% 151 (2%) 40%
Histology
 Ductal car. 1 030 (82%) 70% 3 136 (81%) 74% 1 020 (79%) 60% 5 186 (81%) 71%
 Lobular car. 117 (9%) 56% 360 (9%) 65% 145 (11%) 48% 622 (10%) 59%
 Other 104 (8%) 70% 353 (9%) 78% 122 (9%) 53% 579 (9%) 72%
Grade
 Grade1 472 (35%) 75% 1 347 (32%) 82% 278 (19%) 63% 2 097 (33%) 78%
 Grade2 589 (44%) 69% 1 871 (46%) 72% 584 (44%) 61% 3 044 (48%) 69%
 Grade3 161 (13%) 52% 567 (15%) 65% 411 (30%) 52% 1 139 (18%) 58%
 Unknown grade 29 (9%) 45% 65 (7%) 56% 14 (7%) 21% 107 (2%) 48%
Hormone status
 Positive 1 119 (89%) 70% 3 352 (87%) 75% 978 (76%) 60% 5 449 (85%) 71%
 Intermediate 44 (4%) 57% 110 (3%) 76% 213 (5%) 51% 213 (3%) 65%
 Negative 88 (7%) 60% 387 (10%) 62% 725 (19%) 51% 725 (11%) 58%