Husband is about to clock up three years with CML

My husband was diagnosed simply from a routine blood test. Please tell anyone you know that you must have a blood test every year! He is on Dasatinib 100mg a day. His percentage of bad blood cells have been going down gradually, but have taken a bit of a jump upward lately. He says that if the drug stops working then there is no other option. I read on one of the comments that the readings do go up and down a bit. I hope this is true, because I think he expects not to live over five years from diagnosis, even though my aunt has made it through and I know others who have.