The tests he had are good signs. Elevated AFP occurs in some people with chronic Hepatitis C. Normal rage is below 8.3 Have you asked the doctor about this? If the doctor is concerned, will most likely do more tests to try and pinpoint the cause?
Is his doctor a gastroenterologist or hepatologist who specializes in Hepatitis C? He should be evaluated for retreatment with the new drug(s).
Here is a thread and discussion from last fall
http://www.medhelp.org/posts/Hepatitis-C/AFP-tumor-marker/show/2023902
Read Hectors comments. If the levels kept increasing to 100 and over, that would be cause for more concern.