Univariate and multivariate analysis of predictive factors of upstaging to IBC
| Characteristics | Cases of DCIS
(n = 290) | % | Cases of IBC
(n = 193) | % | Univariate
P-value | Multivariate
OR (95% CI), P |
| Tumor size on ultrasonography | 0.003 | |||||
| ≤ 2 cm | 127 | 43.79 | 59 | 30.57 | Ref | |
| > 2 cm | 139 | 47.93 | 123 | 63.73 | 1.762 (1.167-2.659), 0.007 | |
| Unknown | 24 | 8.28 | 11 | 5.70 | ||
| BI-RADS | 0.022 | |||||
| 3 | 2 | 0.69 | 2 | 1.04 | 1.049 (0.139-7.906), 0.963 | |
| 4A | 13 | 4.48 | 9 | 4.66 | 0.506 (0.181-1.410), 0.193 | |
| 4B | 66 | 22.76 | 34 | 17.62 | 0.520 (0.292-0.926), 0.026 | |
| 4C | 142 | 48.97 | 75 | 38.86 | 0.459 (0.286-0.738), 0.001 | |
| 5 | 59 | 20.34 | 66 | 34.20 | Ref | |
| Unknown | 8 | 2.76 | 7 | 3.63 | ||
DCIS, ductal carcinoma in situ; IBC, invasive breast cancer; OR, odd ratio; CI, confidence interval.