Abstract
Purpose
Ductal carcinoma in situ (DCIS), unlike invasive ductal carcinoma, does not require sentinel lymph node biopsy or axillary lymph node dissection because the possibility of axillary lymph node metastasis is low. However, occasionally, despite preoperative diagnosis of DCIS, invasive ductal carcinoma can be diagnosed by postoperative biopsy. Therefore, a study of the associated risk factors is necessary.
Methods
198 patients with an initial diagnosis of DCIS, treated between February 2005 and December 2009, were retrospectively analyzed. Associations between clinical and pathologic factors were analyzed for significance using univariate and multivariate analyses.
Results
Of the 198 patients, 57 (28.8%) were found to have invasive disease on final pathology. Multivariate analysis revealed 4 independent predictors of invasive cancer upon final pathology: diagnosis by needle biopsy (OR, 3.165; P=0.008), positive p53 on preoperative biopsy (OR, 2.494; P=0.019) DCIS size (>2 cm) on microscopic finding (OR, 2.683; P=0.014), and relatively young age (OR, 0.958, P=0.046). Of the 13 patients with positive axillary lymph nodes, 11 (84.6%) were shown to have invasive cancer on final pathology (P<0.001).
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Table 1.
DICS* | Invasive carcinoma | P-value | |
---|---|---|---|
Age | |||
Mean age | 51.7 (±10.7) | 48.2 (±8.9) | 0.021 |
Symptoms | |||
Screening | 97 (68.8%) | 27 (47.4%) | 0.004 |
Palpable mass | 30 (21.3%) | 21 (36.8%) | 0.020 |
Mastalgia | 3 (2.1%) | 5 (8.8%) | 0.046 |
Nipple discharge | 11 (7.8%) | 4 (7.0%) | 0.557 |
Palpation by clinician | 62 (44.0%) | 36 (63.2%) | 0.011 |
Operation method | 0.450 | ||
BCS† | 76 (53.9%) | 32 (56.1%) | |
Mastectomy | 65 (46.1%) | 25 (43.9%) | |
Total | 141 | 57 |
Table 2.
DCIS* | Invasive carcinoma | P-value | |
---|---|---|---|
Tumor location | 0.211 | ||
Right | 71 (50.4%) | 33 (57.9%) | |
Left | 70 (49.6%) | 24 (42.1%) | |
Tumor location | |||
Central | 13 (9.2%) | 1 (1.8%) | 0.051 |
UOQ† | 58 (41.1%) | 30 (52.6%) | 0.094 |
UIQ‡ | 36 (25.5%) | 13 (22.8%) | 0.418 |
LOQ§ | 22 (15.6%) | 8 (14.0%) | 0.485 |
LIQ∥ | 12 (8.5%) | 5 (8.8%) | 0.574 |
Number of tumor | |||
1 | 127 (90.1%) | 51 (89.5%) | 0.541 |
2 | 4 (2.8%) | 1 (1.8%) | 0.552 |
≥3 | 8 (5.7%) | 4 (7.0%) | 0.471 |
Size | |||
Mean size (mm) | 17.1 (±13.5) | 27.3 (±17.9) | 0.009 |
<2 cm | 103 (73.0%) | 23 (40.4%) | <0.001 |
≥2 cm | 38 (27.0%) | 34 (59.6%) | |
Total | 141 | 57 |
Table 3.
DCIS* | Invasive carcinoma | P-value | |
---|---|---|---|
Microscopic finding | |||
Comedo type | 65 (46.1%) | 29 (50.9%) | 0.325 |
Cribriform type | 61 (34.3%) | 10 (18.2%) | 0.001 |
Papillary type | 25 (17.9%) | 6 (10.5%) | 0.142 |
Solid type | 52 (36.9%) | 17 (29.8%) | 0.219 |
Microcalcification | 100 (70.9%) | 35 (61.4%) | 0.129 |
Necrosis | 81 (57.4%) | 41 (71.9%) | 0.040 |
ER† | 0.073 | ||
Positive | 94 (66.7%) | 31 (54.4%) | |
Negative | 47 (33.3%) | 26 (45.6%) | |
PR‡ | 0.002 | ||
Positive | 93 (66.0%) | 24 (42.1%) | |
Negative | 48 (34.0%) | 33 (57.9%) | |
p53§ | 0.001 | ||
Positive | 34 (27.6%) | 30 (54.5%) | |
Negative | 89 (72.4%) | 25 (45.5%) | |
C-erb2 (3+) | 39 (27.9%) | 19 (33.3%) | 0.275 |
Nuclear grade | |||
1 (low) | 25 (19.2%) | 7 (12.5%) | 0.343 |
2(intermediate) | 75 (57.7%) | 34 (60.7%) | 0.468 |
3 (high) | 30 (13.1%) | 15 (26.8%) | 0.316 |
Total | 141 | 57 |
Table 4.
DCIS* | Invasive carcinoma | P-value | |
---|---|---|---|
Core needle biopsy | 64 (45.4%) | 45 (78.9%) | <0.001 |
Excision biopsy | 77 (54.6%) | 12 (21.1%) | |
MGB† | 39 (27.7%) | 3 (5.3%) | |
Excision biopsy | 24 (17.0%) | 7 (12.3%) | |
Mammotome | 14 (9.9%) | 2 (3.5%) | |
Total | 141 | 57 |
Table 5.
P-value | Odd ratio | ||
---|---|---|---|
Univariate analysis | Multivariate analysis | ||
Age | 0.021 | 0.046 | 0.958 |
Not detect by screening | 0.004 | 0.368 | 1.457 |
Palpation by clinician | 0.011 | 0.569 | 1.281 |
Tumor size >2 cm | <0.001 | 0.014 | 2.683 |
Cribroform type | 0.001 | 0.098 | 2.063 |
Necrosis | 0.040 | 0.393 | 1.422 |
PR(−)* | 0.002 | 0.396 | 1.414 |
p53(+)† | 0.001 | 0.019 | 2.494 |
Needle biopsy | <0.001 | 0.008 | 3.165 |