Tumor growth was assessed by calliper measurements and a Luminex-based assay was used to compare the cytokine/chemokine profiles.<h4>Results</h4>We show that CB-CD34<sup>+</sup> are a uniform population of HSPC that reconstitute NOG mice more rapidly than FL-CD34<sup>+</sup> due to faster B cell development. Here, CD34 is linked to neoplasm.