These drugs, aided by the flu vaccine, remove a block to the immune system that can sometimes result from cancer surgery and also give it a boost.

This was the conclusion that researchers at the University of Ottawa in Canada came to after they tested the effect of tadalafil (Cialis), sildenafil (Viagra), and an inactivated version of the flu vaccine Agriflu in mouse models of post-surgery metastasis.

In a paper now published in the journal OncoImmunology, they report how the unusual combination reduced cancer spread in the mice by over 90 percent.

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