
Umbilical cord (UC) connective tissues contain plastic-adherent, colony forming unit–fibroblasts (CFU-Fs) amenable to culture expansion for potential therapeutic use. We aimed to evaluate commercial UC allograft products for viable cells, CFU-Fs, and protein makeup. Five commercial UC allograft products claiming to contain viable, undescribed "stem cells," 2 obtained from UC blood and 3 from UC tissue , were analyzed. Moreover, a substantial number of proteins within UCB allograft products, were undetectable or present at lower concentrations compared with blood and bone marrow plasma controls. CFU-Fs, often referred to as stem cells, were not found within the commercial UC allograft products analyzed, and clinicians should remain wary of marketing claims stating otherwise.
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