Poor mobilization was defined as a total CD34<sup>+</sup> cell collection of less than 2 × 106 cells/kg or the requirement for extended apheresis with multiple collection cycles.<h4>Results</h4>A total of 430 patients with Hodgkin's lymphoma (n = 134), non-Hodgkin's lymphoma (n = 113), and multiple myeloma (n = 183) were included in this study. This evidence concerns the gene CD34 and plasma cell myeloma.