question: 4 months ago I had a spinal fusion of L4-5 including bone grafts.  In 2007 I was diagnosed with stage 2b ductile breast  cancer.  I've had a lumptecomy, lymph nodes removed, chemo & radiation, and 6 years of  "clean" smooth sailing.  I just got done with my 5 years or Arimides in Feb.  My latest blood tests showed low Vitamin D, and a CA 27.29 of 42 a month ago and 49 a week ago @retest.  My CEA was normal a month ago.  A CA 15-3 was also done a week ago & was 33, & is supposed to be less than 31.  How scared should I be???  My main question is whether or not, especially in light of the low Vit. D dx, the added stress of bony fusion (which the spinal docs say will take a year to "finish" healing) , COULD BE EFFECTING MY TUMOR MARKERS?   Thanks, AAAAA