To further confirm whether NucA could selectively deliver the conjugated PTX-Rh into tumor cells on which nucleolin was highly expressed, we examined the co-localization of PTX-Rh with the nucleolin-expressing cells in the tumor cryosections from the xenografted mice injected with NucA-PTX-Rh or CRO-PTX-Rh by immunofluorescent analysis with confocal imaging. Here, NUCLEOLIN is linked to neoplasm.