TF and cancer: A conjugate of transferrin, NIR dye Cy5.5 and cytotoxic chelating agent (NNE3TA:2,2′-(7-(2-((carboxymethyl)(4-nitrobenzyl)amino)ethyl)-1,4,7-triazonane-1,4-diyl)diacetic acid) (NNE3TA-Transferrin-Cy5.5) was developed to treat and detect cancers (Kang et al., 2016).