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Table 1 Examples of PubMed results from a selection of keyword searches (publication data from December 1, 2009 - March 29, 2013).

From: Literature classification for semi-automated updating of biological knowledgebases

Keyword PubMed hits
cancer OR tumor OR antigen OR epitope 552309
(tumor OR cancer) AND (antigen OR epitope) 45517
tumor AND antigen 40525
tumor antigen 22264
tumor AND antigen AND epitope 3057
tumor AND antigen AND epitope AND T cell 852
"tumor antigen" 642