This is a retrospective real-world study to evaluate the efficacy and feasibility of modified reduce-volume target IMRT in the treatment of patients with non-metastatic NPC

Inclusion Criteria:

1. Pathologic diagnosis (pathologically confirmed by nasopharyngeal biopsy) was nasopharyngeal carcinoma;
2. Newly diagnosed, non-metastatic and treated with modified reduce-volume IMRT;
3. Patients with baseline MRI date of nasopharynx and neck, and completed the first course of treatment in our hospital;
4. Diagnosis time: November 1, 2014 to December 31 , 2017

Exclusion Criteria:

1. Disease progression during IMRT;
2. Previous malignancy or other concomitant malignant diseases;
3. The evaluation information of tumor efficacy can not be obtained;
4. Receive blind treatment in other clinical research.

Non-metastatic NPC patients treated with modified reduce-volume target IMRT in our institution