Polymyositis & Dermatomyositis Support Group
Polymyositis (PM) is a type of chronic inflammation of the muscles (inflammatory myopathy) related to dermatomyositis and inclusion body myositis. The inflammation is predominantly of the endomysium in polymyositis, whereas dermatomyositis is characterized by primarily perimysial inflammation.
I know The Myositis Association has an excellent video from the last conference that discusses cancer in myositis and the autoantibodies associated with the cancer. You might be interested in watching the video, but it is long so make popcorn before viewing.
I would not get worried about the cancer check. It is routine to check for cancer. I know there are several people on this site who will have some helpful tips on this subject from their own experience. I hope you will feel better. Keep us posted.