Medical record review
recurrence/death, death, NPC, Cancer
RECURRENCE, CANCER
In this retrospective study, medical records were reviewed for demographic/clinical characteristics and information on recurrence/death among NPC patients. Follow-up of records review included the 60 months after definitive radiotherapy. Progression-free-survival (PFS) was defined as the duration of definitive radiotherapy completion and recurrence in months. Date of recurrence was determined as the date of documented clinical decision based on imaging modalities. Overall survival (OS) was defined as the duration to definitive radiotherapy completion and death from all causes in months. Cancer staging was based on the Sixth Edition of the American Joint Committee on Cancer’s Cancer Staging Manual to 2009, the Seventh Edition from 2010 to 2017, and Eighth Edition after 2018.