- Jantunen E, Itala M, Siitonen T, Kuittinen T, Heiskanen J, Koivunen E, et al. Blood stem cell mobilization and collection in patients with chronic lymphocytic leukaemia: a nationwide analysis. Bone Marrow Transplant. 2008;41:239-44 pubmed..001). A significant proportion of patients with CLL were difficult to mobilize. Adequate marrow function including platelet counts >100 x 10(9)/l seem to be important factors in terms of successful blood stem cell collection. ..