Growth of ALL cells in different long-term culture systems. Growth of ALL cells from 9 patients were evaluated in suspension culture supplemented with F36GMGS or with IL-3, IL-7, and SCF and compared with growth in standard LTBMC and LTBMC supplemented with IL-3, IL-7, and SCF over a 6-week period. Cultures were maintained with weekly half-media changes, and the number of viable cells present at each week was determined using flow cytometry. Results from 8 patients where cell expansion was observed in culture are shown. Data are expressed as means ± standard error of measurement.