Source:http://linkedlifedata.com/resource/umls/id/C0530993
NCI: A fragment of cytokeratin 19. A tumor marker. Reported to be a sensitive serum marker of recurrent breast cancer. May also be a good prognostic marker, with patients with high serum levels of the marker having shorter disease-free survival. (from Cancer 2000;89:1285-1290 via Medscape)