Claim: RUNX3 (a protein, consisting of one or more long chains of amino acid) had doubt over the tumor suppressor function  and how it likely acts as one in epithelial cancer.
Evidence: In 2011 serious doubt was cast over the tumor suppressor function of Runx3 originated from the earlier publication by Li and co-workers. On the basis of the original study by Li and co-workers (2002), the majority of later literature citing Li and co-workers (2002) assumed that RUNX3 was expressed in the normal gut epithelium and that it is therefore likely to act as a tumor suppressor in the particular epithelial cancer investigated. Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.