Predictive factors correlation ranked by LASSO.

Abbreviation: LASSO: least absolute shrinkage and selection operator; BMI: body mass index
SCF: Irradiated to supraclavicular fossa; IMN: Irradiated to internal mammary lymph nodes; MLD: mean dose to the ipsilateral lung; IV5-IV50: ipsilateral lung volume received 5-50Gy (%); AIV5-AIV50: absolute ipsilateral lung volume received 5-50Gy (cc); Definition of risk factors: Same as Table 2.
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
Predictive factors correlation ranked by LASSO.