Table 6 Univariate and multivariate analyses for early recurrence in those receiving endocrine therapy alone (early vs no recurrence)

ALDH1, ≤1 %/>1 %

1.804 (0.651–4.609)

0.244

Not selected

Age, ≤50/>50 years

0.996 (0.526–1.932)

0.992

Not selected

Tumor size, ≤20/>20 mm

6.182 (3.208–12.383)

<0.001

4.910 (2.469–10.076)

<0.001

Nodal metastasis negative/positive

3.344 (1.543–7.181)

0.002

2.894 (1.229–6.777)

0.002

Progesterone receptor staining, <20 %/≥20 %

0.708 (0.382–1.313)

0.272

Not selected

Ki-67 staining, <20 %/≥20 %

1.441 (0.619–3.159)

0.383

Not selected

Tumor grade 1 or 2/3

2.615 (1.666–4.128)

<0.001

2.820 (1.296–6.111)

<0.001