Sheila,
The abstract of the research paper in the journal
Cancer (dated 1 Feb 2007)does not answer to your concern about Xeloda & aspirin.
There is no mention of the treatment history of the patients who were part of the study(the full text available online for $25 may be more informative).
Your onc (or perhaps yourself) might get more info by contacting one of the authors of the paper:
email: Dr Jean-Bernard Durand (
jdurand@mdanderson.org)
If the speculation by Dr Jean-Bernard Durand that cancer changes the clotting process in which the platelets are involved is proven correct then which chemo treatment is used may not matter.