Table 4.
Comparison of breast cancer-specific survival (BCSS) and overall survival (OS) between OBC and non-OBC in different nodal status using a multivariate Cox proportional hazard model in the propensity score matched group.
| Nodal status | BCSS | OS | ||
|---|---|---|---|---|
| HR (95% CI) | Pa | HR (95% CI) | Pa | |
| N1 | 0.331 | 0.619 | ||
| OBC | 0.785 (0.481–1.280) | 0.903 (0.605–1.349) | ||
| non-OBC | Reference | Reference | ||
| N2/N3 | 0.019 | 0.013 | ||
| OBC | 0.604 (0.397–0.919) | 0.620 (0.425–0.904) | ||
| non-OBC | Reference | Reference | ||
| N1/N2/N3 | 0.025 | 0.040 | ||
| OBC | 0.697 (0.508–0.957) | 0.753 (0.574–0.987) | ||
| non-OBC | Reference | Reference | ||
OBC, occult breast cancer; non-OBC, non-occult breast cancer; HR, hazard ratio; CI, confidence interval; BCSS, breast cancer-specific survival; OS, overall survival.
a
P-value was adjusted by a multivariate Cox proportional hazard regression model including age, race, marital status, year of diagnosis, grade, mastectomy or not, ER status, PR status, HER-2 status, chemotherapy, and radiation. Bold type indicates significance.