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Examples of gross tumor volume (GTV) delineation: GTVs of primary tumor (pGTV) and metastatic lymph node (nGTV) were delineated on computed tomography images taken before radiation therapy (A, C) and during radiation therapy (at 28.6 Gy irradiation) (B, D) in a patient with cT3N2M0 nasopharyngeal cancer. Tumor reduction rate in this case was –40%.
