I've got high blood pressure as well. Mine never went above borderline. Due to family history, my GP put me on Diovan and an 81mg aspirin every morning. My blood pressure has been low to mid normal range for 7-8 years now. The use of aspirin to improve cardio health is not new, but this is the first reference I have seen to helping with cancer.
There have been a few retro spective studies re aspirin and a protective effect re colon cancer.
Doctors are concerned that people will over do the aspirin and set themselves up for GI bleeds.
There are several references in the medical literature. One of the more interesting one is the probability of aspiring lowering the re appearance of colon cancer after surgery and treatment.