the tumor markers examined include carcinoembryonic antigen ( cea ) , the ras gene products p21 and p21ser ( mutated form ) , and beta-d-galactosyl- ( 1 -- -- 3 ) -alpha-n-acetyl-d-galactosamine ( gal -- gal nac , also known as t-antigen ) .
C0041365
tumor markers
C0007082
carcinoembryonic antigen