Table 5.

Proportion of patients whose axillary lymph node status had become negative by the time of surgery^a

Group	N( +) at screening	Underwent surgery	ypN0	N( +) at screening and underwent surgery	N( +) at screening and underwent surgery, and achieved ypN0	Axillary lymph node status had become negative, % (95% CIb)	Pc
A1 (n = 23)	8	23	19	8	7	88 (47–100)	1.00
A2 (n = 22)	8	22	16	8	6	75 (35–97)
B1 (n = 27)	11	24	17	9	5	45 (17–77)	0.36
B2 (n = 27)	10	25	15	9	2	20 (3–56)

^aValues are n unless otherwise stated

^bClopper–Pearson exact confidence interval

^cFisher’s exact test: group A1 versus A2 or group B1 versus group B2