Table 5.
Tumor characteristics among young women aged 18–39 years who were undergoing their first mammography*
| Screening mammography, No. (%)† |
Diagnostic mammography, No. (%)† |
|||
| Characteristic | ≤34 y | 35–39 y | ≤34 y | 35–39 y |
| Total | 33 | 155 | 211 | 315 |
| Cancer type | ||||
| Ductal carcinoma in situ | 6 (18.2) | 46 (29.7) | 11 (5.2) | 28 (8.9) |
| Invasive | 27 (81.8) | 109 (70.3) | 200 (94.8) | 287 (91.1) |
| Stage | ||||
| 0 | 6 (18.2) | 46 (29.7) | 11 (5.2) | 28 (8.9) |
| I | 5 (15.2) | 30 (19.3) | 52 (24.6) | 86 (27.3) |
| II | 8 (24.2) | 43 (27.7) | 88 (41.7) | 116 (36.8) |
| III | 7 (21.2) | 15 (9.7) | 27 (12.8) | 44 (14.0) |
| IV | 0 (0.0) | 3 (1.9) | 7 (3.3) | 14 (4.4) |
| Missing‡ | 7 (21.2) | 18 (11.6) | 26 (12.3) | 27 (8.6) |
| Grade | ||||
| Well differentiated | 1 (3.0) | 13 (8.4) | 7 (3.3) | 25 (7.9) |
| Moderately differentiated | 8 (24.2) | 41 (26.4) | 54 (25.6) | 89 (28.3) |
| Poorly differentiated | 17 (51.5) | 65 (41.9) | 98 (46.4) | 146 (46.3) |
| Undifferentiated | 1 (3.0) | 8 (5.2) | 18 (8.5) | 17 (5.4) |
| Missing‡ | 6 (18.2) | 28 (18.1) | 34 (16.1) | 38 (12.1) |
| Tumor size, mm | ||||
| 0–5 | 1 (3.0) | 15 (9.7) | 11 (5.2) | 13 (4.1) |
| 6–10 | 3 (9.1) | 15 (9.7) | 14 (6.6) | 28 (8.9) |
| 11–20 | 6 (18.2) | 43 (27.7) | 69 (32.7) | 102 (32.4) |
| 21–50 | 10 (30.3) | 44 (28.4) | 73 (34.6) | 118 (37.5) |
| ≥51 | 3 (9.1) | 7 (4.5) | 17 (8.1) | 16 (5.1) |
| Missing‡ | 10 (30.3) | 31 (20.0) | 27 (12.8) | 38 (12.1) |
| ER–PR status | ||||
| Positive–positive | 11 (33.3) | 45 (29.0) | 79 (37.4) | 121 (38.4) |
| Positive–negative | 0 (0.0) | 8 (5.2) | 16 (7.6) | 18 (5.7) |
| Negative–positive | 0 (0.0) | 0 (0.0) | 5 (2.4) | 13 (4.1) |
| Negative–negative | 10 (30.3) | 32 (20.6) | 50 (23.7) | 67 (21.3) |
| Missing‡ | 12 (36.4) | 70 (45.2) | 61 (28.9) | 96 (30.5) |
| Lymph node status | ||||
| Positive | 15 (45.4) | 46 (29.7) | 93 (44.1) | 143 (45.4) |
| Negative | 16 (48.5) | 101 (65.2) | 109 (51.6) | 166 (52.7) |
| Missing‡ | 2 (6.1) | 8 (5.2) | 9 (4.3) | 6 (1.9) |
*
ER = estrogen receptor; PR = progesterone receptor.
†
Percentage of non-missing values.
‡
Percentage of total values.