Stromal cell-conditioned medium does not significantly alter the response of JM-1 cells to Ara-C or VP-16.

JM-1 cells were cultured in 75% stromal cell conditioned medium for 24 to 72 hours in the presence or absence of VP-16 or Ara-C, as described in “Materials and methods.” Viability was evaluated by trypan blue exclusion in triplicate samples. Data shown are mean ± SEM and are representative of 3 independent experiments.