Human biliary tree stem/progenitors (hBTSCs) are being used for cell therapies of patients with liver cirrhosis. A cryopreservation method was established to optimize sourcing of hBTSCs for these clinical programs and that comprises serum-free Kubota's Medium (KM) supplemented with 10% dimethyl sulfoxide (DMSO), -3% recombinant human albumin and 0.1% hyaluronans. Cryopreserved versus freshly isolated hBTSCs were similar