in gi cancers it was disclosed that the percentage volume of smooth muscular cells in the medial layer , as high as 80 % in segments of unaffected artery located at a distance from a cancer , rapidly fell to 30 % or less as it reached and penetrated into a tumor , and that at the tumor center , a host artery was often transformed into a dilated sac with a purely collagenous wall .
C0006826
cancer
C0027651
tumor