If anxiety = increased risk for cancer in men, and mast cell dysfunction = increased risk for anxiety (or, anxiety is a common comorbid condition to Mast Cell Activation Disorders), then is it possible that a route cause or contributor to the increased risk of cancer in men (and women) with anxiety = mast cell dysfunction?
Mast cell dysfunction seems plausible since it has been linked to both an increase in stress, and to cancer in men and women.

Another thought – if hypermobility = increased the risk for or predisposition to anxiety, and mast cell dysfunction is comorbid to hypermobility, then one may ask, “Is there a route cause or underlying common dysfunction between hypermobility, and the link between men with anxiety and the increased risk of cancer?”

If so, what is it? 

“‘Men with anxiety are more vulnerable to cancer,’ study says.”

http://www.latimes.com/science/sciencenow/la-sci-sn-cancer-anxiety-men-20160920-snap-story.html

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