Table 2 Results of proportional hazard Cox regression models for overall survival among overweight and obese patients in comparison with normal BMI patients

All patients

Overweight

(0.29–0.98)

(0.26–0.99)

Obese

(0.29–1.02)

(0.26–1.15)

Age (years) ≥ 50

Overweight

(0.06–1.56)

(0.05–1.52)

Obese

(0.08–1.81)

(0.05–1.45)

Age (years) < 50

Overweight

(0.35–1.35)

(0.28–1.17)

Obese

(0.35–1.78)

(0.22–1.60)

≥2 metastatic sites

Overweight

(0.34–1.58)

(0.28–1.56)

Obese

(0.54–3.07)

(0.54–3.83)

1 metastatic site

Overweight

(0.14–1.01)

(0.13–1.80)

Obese

(0.14–0.92)

(0.07–1.25)

≥ 2nd line

Overweight

(0.21–1.05)

(0.15–0.92)

Obese

(0.21–1.15)

(0.17–1.34)

1st line

Overweight

(0.21–1.35)

(0.36–2.64)

Obese

(0.18–1.29)

(0.35–7.39)

Hormone receptors (−)

Overweight

(0.25–1.85)

(0.23–2.17)

Obese

(0.21–1.54)

(0.34–3.39)

Hormone receptors (+)

Overweight

(0.27–1.33)

(0.16–1.28)

Obese

(0.26–1.57)

(0.10–1.30)

HER2 (−)

Overweight

(0.10–1.24)

(0.11–1.68)

Obese

(0.16–1.69)

(0.06–5.14)

HER2 (+)

Overweight

(0.30–1.46)

(0.24–1.32)

Obese

(0.22–1.18)

(0.23–1.44)