Pretreatment Low Serum Sodium as a Prognostic Factor for Patients with Esophageal Cancer Treated with Radiotherapy or Chemoradiotherapy

Figure 3

(a) Kaplan–Meier survival curves for OS according to the serum sodium concentration in the radiotherapy alone subgroup. (b) Kaplan–Meier survival curves for OS according to the serum sodium concentration in the chemoradiotherapy subgroup.

(a)

(b)