Which Has a Greater Impact on the Recurrence in Young Breast Cancer Patients: Recent Childbirth or Recent Breastfeeding?

Table 2

Risk of recurrence in young breast cancer patients with different ER status.

Parity group	Unadjusted		Adjusted
	HR (95% CI)		HR (95% CI)
ER-positive
Nulliparous (N = 64)	1.63 (0.74–3.61)	0.227	0.92 (0.36–2.39)	0.866
PPBC <2 (N = 68)	4.04 (2.13–7.64)	0.000	2.28 (1.10–4.73)	0.026
PPBC 2–5 (N = 141)	1.83 (1.00–3.36)	0.051	0.99 (0.48–2.07)	0.985
PPBC 5–10 (N = 218)	1.69 (0.95–3.01)	0.076	1.28 (0.70–2.35)	0.430
PPBC >10 (N = 191)	1.00		1.00
ER-negative
Nulliparous (N = 32)	2.31 (1.00–5.34)	0.051	2.36 (0.85–6.56)	0.098
PPBC <2 (N = 51)	2.13 (1.00–4.55)	0.051	1.64 (0.69–3.89)	0.260
PPBC 2–5 (N = 67)	1.04 (0.46–2.35)	0.919	0.87 (0.34–2.25)	0.769
PPBC 5–10 (N = 90)	1.26 (0.62–2.53)	0.524	1.23 (0.57–2.63)	0.599
PPBC >10 (N = 84)	1.00		1.00

Adjusted for age at diagnosis and TNM stage. The control group was patients with PPBC >10.