Yes I wouldn't worry too much at this stage, especially after just your first cycle. The test is quite sensitive I believe, and if they did it twice in one day you would get two different results. I think you ideally want to see a trend of the tumor markers decrease over time, measuring it perhaps once a month. Having said that, for some people the tumor markers are not a good indicator at all. They may be low but the cancer has returned. So depending on the person, a magical combination of tumor markers, scans, feeling of wellness, presence of any symptoms and other things like liver function tests is what we have to go on... so don't focus too much on that number.