Table 1. Surface Expression of TRAIL-R1 and -R2 in NPC cells in the presence or absence of IFNβ.

	Incubation	0 h		24 h		48 h		72 h
Cells		Control	IFNβ	Control	IFNβ	Control	IFNβ	Control	IFNβ
HONE-1	TRAIL-R1	0.02 ± 2.1	0.02 ± 1.0	0.04 ± 2.1	0.07 ± 2.8	0.3 ± 0.4	6.1 ± 0.2	5.8 ± 0.01	15.0 ± 0.2
	TRAIL-R2	30.3 ± 3.2	29.1 ± 2.2	29.0 ± 3.1	55.9 ± 3.0	33.0 ± 2.5	72.2 ± 3.3	35.3 ± 4.5	80.3 ± 3.2
HONE-1 EBV	TRAIL-R1	0.03 ± 3.4	0.04 ± 1.9	0.08 ± 2.0	0.05 ± 1.3	0.2 ± 0.3	5.5 ± 0.2	6.6 ± 0.01	13.0 ± 0.5
	TRAIL-R2	28.8 ± 2.9	27.1 ± 1.9	30.7 ± 4.2	48.0 ± 1.9	31.1 ± 1.2	78.0 ± 2.8	29.0 ± 3.2	89.9 ± 2.2
HK1	TRAIL-R1	0.02 ± 2.7	0.03 ± 3.0	0.1 ± 0.1	0.9 ± 0.3	1.1 ± 0.5	12.3 ± 0.4	12.9 ± 0.2	25.0 ± 0.3
	TRAIL-R2	29.9 ± 2.2	32.4 ± 3.0	30.9 ± 2.7	58.0 ± 2.3	35.6 ± 3.1	80.1 ± 3.3	37.7 ± 2.3	88.1 ± 4.1
TW1	TRAIL-R1	0.01 ± 1.3	0.01 ± 2.3	0.1 ± 0.2	0.7 ± 0.2	0.9 ± 0.2	7.0 ± 0.2	7.4 ± 0.2	10.0 ± 0.2
	TRAIL-R2	16.0 ± 2.0	16.3 ± 2.9	16.0 ± 3.2	39.3 ± 5.2	18.0 ± 2.5	69.1 ± 2.1	15.8 ± 1.5	84.4 ± 1.4
CNE-2	TRAIL-R1	0.04 ± 2.2	0.1 ± 3.4	0.1 ± 2.3	0.09 ± 1.8	1.1 ± 0.2	12.0 ± 0.7	13.5 ± 0.1	20.0 ± 0.2
	TRAIL-R2	40.1 ± 3.1	38.4 ± 2.7	47.6 ± 2.3	46.5 ± 3.0	67.2 ± 5.3	68.8 ± 2.3	77.7 ± 3.3	80.8 ± 3.5
C666-1	TRAIL-R1	0.04 ± 3.3	0.05 ± 2.8	0.06 ± 3.8	0.1 ± 3.5	2.0 ± 0.2	5.2 ± 0.1	5.5 ± 0.2	13.0 ± 0.1
	TRAIL-R2	3.0 ± 2.2	4.1 ± 3.4	4.3 ± 4.0	4.5 ± 3.2	3.9 ± 2.2	6.5 ± 2.5	3.9 ± 4.2	6.2 ± 2.5
C17-PDX	TRAIL-R1	0.07 ± 3.4	0.09 ± 2.9	2.2 ± 2.0	10.1 ± 2.2	3.0 ± 0.3	18.1 ± 0.1	13.2 ± 0.2	23 ± 0.5
	TRAIL-R2	6.0 ± 1.9	5.8 ± 2.2	5.9 ± 2.2	37.7 ± 2.7	6.3 ± 2.5	40.2 ± 3.5	5.3 ± 3.3	60 ± 2.5
NP69	TRAIL-R1	29 ± 0.5	32 ± 0.3	28 ± 0.2	28 ± 0.5	31 ± 0.5	31 ± 0.2	29 ± 0.5	30 ± 0.5
	TRAIL-R2	0.05 ± 2.0	0.06 ± 0.9	0.08 ± 1.0	0.04 ± 3.4	4.8 ± 3.5	5.5 ± 3.5	5 ± 2.2	5 ± 2.5

Values are net fluorescent intensities between mean fluorescent intensity of anti-TRAIL-R1 or -R2 antibody and mean fluorescent intensity of respective isotype. Cells were incubated for indicated time periods with or without 1,000 U/ml IFNβ.