Platelets and PRMs promote survival of Eμ-myc cell lines. (A) Eμ-myc cell lines A118C, 5849, 1194, and AF40A were coincubated with murine platelets for 48 hours at 37°C and 5% serum, and percentage survival was assessed by flow cytometry. n = 4 to 12 per condition. (B) Eμ-myc cell lines were coincubated with murine platelets or PRMs for 48 hours at 37°C and 5% serum, and percentage survival was assessed by flow cytometry. A118C, n = 12 to 22; 5849, n = 21 to 54; 1194, n = 18; and AF40A, n = 12 to 15. Vehicle (n = 3 per cell line) includes thrombin. Results are presented as the mean ± SEM. Student unpaired t test, ∗P < .05, ∗∗P < .005, ∗∗∗P < .001, ∗∗∗∗P < .0001. ns, not significant.