Table 4. Malignancy incidence in secondary recipient mice in Exp 2 (Donor: CD45.1⁺; Recipient: CD45.2⁺).

Vector	# Primary donormice for secondarytransplant	# Secondary recipients	# Vector+HematologicalMalignancies	# Recipient derived hematological malignancies	# Other death*	# tumor free at autopsy(6–7 months)
Mock	14	42	0	3	2	37
MFG	14	42	1**	0	2	39
SFFV	18	54	7 ***	1	2	44
EF1α	15	45	0	3	2	40

^*Other death: Mice died or sacrificed before reaching end points, but not due to hematological malignancies.

^**not definitive in terms of vector presence.

^***P<0.05.

VCN: Vector copy number in peripheral blood mononuclear cells at 30 weeks.