NUCLEOLIN and cancer: The cellular uptake of NucA-PTX-Rh was shown in a nucleolin-dependent manner and significantly higher in cancer cells, while the uptake of CRO-PTX-Rh was moderate and did not exhibited notable difference in cell lines with various surface nucleolin expression levels, suggesting that the interaction between NucA and nucleolin played a crucial role in the entrance of the conjugated PTX into cancer cells.