Hultmanet al. (2018) found that post DXR treatment the BE (2)-C (neuroblastoma cell line derived from human bone marrow) tumor growth presented a remarkable increase in Ki-67-index (from 43% to 64%; p<0.01), thus indicating a move towards cycling cells by application of DXR.Tredanet al. (2007) previously determined the same hypothesis and foundin vitro that quiescent (G0) tumor cells enter cell cycle after DXR treatment. Here, MKI67 is linked to neoplasm.