Characteristics of patients.

Abbreviation: Group 0: Without symptomatic radiation pneumonitis; Group 1: Symptomatic radiation pneumonitis BMI: body mass index; SCF: Irradiation to supraclavicular fossa; IMN: Irradiation to internal mammary lymph nodes; PM: partial mastectomy; MPM: modified radical mastectomy; SRP: Symptomatic radiation pneumonitis; Lung (d): maximum Lung depth from chest wall to tangential line between extreme points of PTV in the section of nipple on CT image Total (d): maximum depth from skin to tangential line between extreme points of PTV in the section of nipple on CT image Characteristics of patients.