Table 2.

Univariate analysis.

First line	Characteristics	No.	Events	HR (95%CI)	Median PFS (95%CI)	p-Value
	PR
	Low (<20%)	17	11	2.07 (0.87–4.9)	7.0 (3.0, NA)	0.099
	High (≥20%)	30	10	1.00	15.0 (12.0, NA)
	Ki67
	Low (<20%)	31	11	1.00	15.0 (12.0, NA)	0.233
	High (≥20%)	16	10	1.69 (0.71–3.99)	8.5 (5.0, NA)
	Luminal
	A	22	5	1.00	14.0 (14.0, NA)	0.053
	B	25	16	2.72 (0.99–7.48)	7.0 (5.0, NA)
	PR (continuous)			0.99 (0.98–1.01)	-	0.293
	Ki67 (continuous)			1.04 (1.01–1.08)	-	0.008
Second line	PR
	Low (<20%)	9	5	1.00	9.0 (7.0, NA)	0.335
	High (≥20%)	11	6	1.88 (0.2, 6.82)	11.0 (10.0, NA)
	Ki67
	Low (<20%)	6	3	1.50 (0.37, 6.14)	9.0 (5.0, NA)	0.570
	High (≥20%)	13	8	1.00	11.0 (7.0, NA)
	Luminal
	A	2	1	1.44 (0.17, 12.06)	9.0 (NA, NA)	0.735
	B	17	10	1.00	11.0 (7.0, NA)
	PR (continuous)			1.01 (0.99, 1.02)	-	0.461
	Ki67 (continuous)			1.03 (0.97, 1.10)	-	0.346

NA, not applicable.