Table 2. Annual trends in patient age, type of breast surgery, axillary surgery, reconstruction, adjuvant radiation, hospital region, and hospital size.
| Variables | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age (years) | ||||||||||||
| 20–29 | 33 (1.5) | 66 (3.4) | 66 (2.9) | 0 (0.0) | 99 (3.1) | 0 (0.0) | 99 (2.2) | 0 (0.0) | 99 (2.1) | 0 (0.0) | 50 (0.8) | 250 (3.9) |
| 30–39 | 363 (16.4) | 165 (8.5) | 429 (18.8) | 462 (16.9) | 363 (11.3) | 594 (14.4) | 594 (13.1) | 594 (11.2) | 660 (14.1) | 462 (8.4) | 650 (10.7) | 600 (9.3) |
| 40–49 | 1,056 (47.8) | 891 (45.8) | 627 (27.5) | 1,089 (39.8) | 1,518 (47.4) | 1,518 (36.8) | 1,782 (39.4) | 2,178 (41.0) | 1,551 (33.1) | 1,980 (36.1) | 2,050 (33.6) | 2,700 (41.9) |
| 50–59 | 528 (23.9) | 495 (25.4) | 660 (29.0) | 759 (27.7) | 825 (25.8) | 1,221 (29.6) | 1,221 (27.0) | 1,287 (24.2) | 1,551 (33.1) | 1,584 (28.9) | 1,650 (27.0) | 1,800 (27.9) |
| 60–69 | 198 (9.0) | 231 (11.9) | 396 (17.4) | 264 (9.6) | 132 (4.1) | 528 (12.8) | 627 (13.9) | 891 (16.8) | 594 (12.7) | 1,056 (19.3) | 1,500 (24.6) | 900 (14.0) |
| ≥70 | 33 (1.5) | 99 (5.1) | 99 (4.3) | 165 (6.0) | 264 (8.2) | 264 (6.4) | 198 (4.4) | 363 (6.8) | 231 (4.9) | 396 (7.2) | 200 (3.3) | 200 (3.1) |
| Combined age (years) | ||||||||||||
| <70 | 2,178 (98.5) | 1,848 (94.9) | 2,178 (95.7) | 2,574 (94.0) | 2,937 (91.8) | 3,861 (93.6) | 4,323 (95.6) | 4,950 (93.2) | 4,455 (95.1) | 5,082 (92.8) | 5,900 (96.7) | 6,250 (96.9) |
| ≥70 | 33 (1.5) | 99 (5.1) | 99 (4.3) | 165 (6.0) | 264 (8.2) | 264 (6.4) | 198 (4.4) | 363 (6.8) | 231 (4.9) | 396 (7.2) | 200 (3.3) | 200 (3.1) |
| Surgery type | ||||||||||||
| BCS | 1,254 (56.7) | 957 (49.2) | 1,221 (53.6) | 1,650 (60.2) | 1,848 (57.7) | 2,145 (52.0) | 2,277 (50.4) | 2,673 (50.3) | 3,036 (64.8) | 3,795 (69.3) | 4,400 (72.1) | 4,250 (65.4) |
| TM | 957 (43.3) | 990 (50.8) | 1,056 (46.4) | 1,089 (39.8) | 1,353 (42.3) | 1,980 (48.0) | 2,244 (49.6) | 2,640 (49.7) | 1,650 (35.2) | 1,683 (30.7) | 1,700 (27.9) | 2,250 (34.6) |
| Axillary surgery | ||||||||||||
| ALND | 0 (0.0) | 33 (6.2) | 0 (0.0) | 0 (0.0) | 33 (2.9) | 33 (2.5) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| Excision | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 33 (2.6) | 0 (0.0) | 0 (0.0) | 33 (0.9) | 0 (0.0) | 0 (0.0) |
| SNB | 561 (100.0) | 495 (93.8) | 627 (100.0) | 1,023 (100.0) | 1,122 (97.1) | 1,287 (97.5) | 1,221 (97.4) | 2,343 (100.0) | 2,772 (100.0) | 3,498 (99.1) | 3,950 (100.0) | 4,200 (100.0) |
| Reconstruction surgery | ||||||||||||
| Autologous | – | – | – | – | – | – | 264 (36.4) | 99 (13.6) | 297 (29.0) | 264 (22.9) | 250 (21.7) | 200 (11.1) |
| Implant | – | – | – | – | – | – | 462 (63.6) | 627 (86.4) | 693 (67.7) | 891 (77.1) | 850 (73.9) | 1,600 (88.9) |
| Nipple-areolar reconstruction | – | – | – | – | – | – | 0 (0.0) | 0 (0.0) | 33 (3.2) | 0 (0.0) | 50 (4.3) | 0 (0.0) |
| RT | ||||||||||||
| No | 1,551 (70.1) | 1,287 (66.1) | 1,584 (69.6) | 1,353 (49.4) | 1,914 (59.8) | 2,508 (60.8) | 3,003 (66.4) | 3,399 (64.0) | 2,937 (62.7) | 3,894 (71.1) | 3,700 (60.7) | 4,300 (66.2) |
| Yes | 660 (29.9) | 660 (33.9) | 693 (30.4) | 1,386 (50.6) | 1,287 (40.2) | 1,617 (39.2) | 1,518 (33.6) | 1,914 (36.0) | 1,749 (37.3) | 1,584 (28.9) | 2,400 (39.3) | 2,200 (33.8) |
| Surgery-RT | ||||||||||||
| BCS alone | 627 (28.4) | 330 (16.9) | 561 (24.6) | 330 (12.0) | 561 (17.5) | 594 (14.4) | 825 (18.2) | 792 (14.9) | 1,320 (28.2) | 2,244 (41.0) | 2,000 (32.8) | 2,100 (32.3) |
| BCS + RT | 627 (28.4) | 627 (32.2) | 660 (29.0) | 1,320 (48.2) | 1,287 (40.2) | 1,551 (37.6) | 1,452 (32.1) | 1,881 (35.4) | 1,716 (36.6) | 1,551 (28.3) | 2,400 (39.3) | 2,150 (33.1) |
| TM alone | 924 (41.8) | 957 (49.2) | 1,023 (44.9) | 1,023 (37.3) | 1,353 (42.3) | 1,914 (46.4) | 2,178 (48.2) | 2,607 (49.1) | 1,617 (34.5) | 1,650 (30.1) | 1,700 (27.9) | 2,200 (33.8) |
| TM + RT | 33 (1.5) | 33 (1.7) | 33 (1.4) | 66 (2.4) | 0 (0.0) | 66 (1.6) | 66 (1.5) | 33 (0.6) | 33 (0.7) | 33 (0.6) | 0 (0.0) | 50 (0.8) |
| Region of surgery I | ||||||||||||
| Non-Seoul | 1,155 (52.2) | 990 (50.8) | 990 (43.5) | 1,518 (55.4) | 1,782 (55.7) | 2,211 (53.6) | 2,310 (51.1) | 2,937 (55.3) | 2,640 (56.3) | 2,937 (53.6) | 3,050 (50.0) | 3,350 (51.5) |
| Seoul | 1,056 (47.8) | 957 (49.2) | 1,287 (56.5) | 1,221 (44.6) | 1,419 (44.3) | 1,914 (46.4) | 2,211 (48.9) | 2,376 (44.7) | 2,046 (43.7) | 2,541 (46.4) | 3,050 (50.0) | 3,150 (48.5) |
| Region of surgery II | ||||||||||||
| Non-capital | 858 (38.8) | 495 (25.4) | 528 (23.2) | 792 (28.9) | 957 (29.9) | 1,056 (25.6) | 1,320 (29.2) | 1,683 (31.7) | 1,848 (39.4) | 1,584 (28.9) | 1,950 (32.0) | 2,000 (30.8) |
| Capital area | 1,353 (61.2) | 1,452 (74.6) | 1,749 (76.8) | 1,947 (71.1) | 2,244 (70.1) | 3,069 (74.4) | 3,201 (70.8) | 3,630 (68.3) | 2,838 (60.6) | 3,894 (71.1) | 4,150 (68.0) | 4,500 (69.2) |
| Region of surgery III | ||||||||||||
| Non-metropolitan | 297 (13.4) | 231 (11.9) | 231 (10.1) | 198 (7.2) | 231 (7.2) | 429 (10.4) | 396 (8.8) | 759 (14.3) | 759 (16.2) | 693 (12.7) | 650 (10.7) | 500 (7.7) |
| Metropolitan | 1,914 (86.6) | 1,716 (88.1) | 2,046 (89.9) | 2,541 (92.8) | 2,970 (92.8) | 3,696 (89.6) | 4,125 (91.2) | 4,554 (85.7) | 3,927 (83.8) | 4,785 (87.3) | 5,450 (89.3) | 6,000 (92.3) |
| Size of hospital of surgery | ||||||||||||
| <800 beds | 891 (40.3) | 627 (32.2) | 990 (43.5) | 924 (33.7) | 1,551 (48.5) | 1,683 (40.8) | 1,353 (29.9) | 1,617 (30.4) | 1,749 (37.3) | 1,848 (33.7) | 2,350 (38.5) | 2,350 (36.2) |
| ≥800 beds | 1,320 (59.7) | 1,320 (67.8) | 1,287 (56.5) | 1,815 (66.3) | 1,650 (51.5) | 2,442 (59.2) | 3,168 (70.1) | 3,696 (69.6) | 2,937 (62.7) | 3,630 (66.3) | 3,750 (61.5) | 4,150 (63.8) |
Data are presented as number (%), unless otherwise indicated. BCS, breast-conserving surgery; TM, total mastectomy; ALND, axillary lymph node dissection; SNB, sentinel node biopsy; RT, radiation therapy.