Research Paper Volume 13, Issue 14 pp 18645—18657

A nomogram for predicting late radiation-induced xerostomia among locoregionally advanced nasopharyngeal carcinoma in intensity modulated radiation therapy era


Figure 2. Nomogram of Xer2y occurrence prediction. For each individual patient, the value of three variables (VMAT, CCRT and coMD) are translated into points by projecting them into the upper-most line (point scale), respectively. Summing the points of the three variables and projecting the total points value downward to the bottom-most line can determine the probability of this patient to have Xer2y (patient-reported xerostomia at least 2 years after radiotherapy). VMAT (volumetric modulated arc radiotherapy). CCRT (platinum-based concurrent chemoradiotherapy). coMD (Contralateral Parotid mean dose).