Follow-up
Follow-up visits included evaluation of symptoms, physical examination,
blood tests, cancer biomarkers, thyroid function tests, endoscopy, CT or
magnetic resonance imaging (MRI) scans of the neck and thorax, and
ultrasonography of the cervical and abdominal regions. These were
accomplished 1 month after the completion of RT, every 3 months in the
first 2 years, every 6 months between years 3 and 5, and once a year
thereafter.