Oh bless you, Cazzeroo, for trying to be such a good friend.  I am sure others will have good suggestions but for what it is worth:  Listen to your friend; don't tell her not to worry - she will be worried.  Try to distract her by all means by taking her out on little trips or whatever she wants to do.  Treat her as the person she has always been - she hasn't become a different person because she is waiting for the results of biopsies.   That is just a few starters I have learned from family and friends over the years.  Annie