Red processed meat and things that affect CA 27-29 marker readings?

Without thinking, I had a pastrami sandwich for dinner and half for breakfast the day of my 27-29. That tumor marker went down from 188 to 33 in 7 months. The day after the test I got the results and it went up 9 points to 42. I've read fifteenth things about red mean and especially processed red meat affecting blood results. I'm stressed . Anyone ever hear of red meat and blood work? I had the test two hours after eating half a huge sandwich and about 22 hours after eating the other half for dinner. Thanks Janet