Table 1. Quantification of telomerase activity and hTERT alternative splicing variants in tumor cell lines.

Cell lines	Source	Telomerase activity*(TPG units)	hTERT overall transcripts#	hTERT alternative splicing variants
				Relative expression#			Constituent ratio★
				α-deletiontranscripts	β-deletiontranscripts	γ-deletiontranscripts	α-deletiontranscripts	β-deletiontranscripts	γ-deletiontranscripts
A549	Lung adenocarcinoma	31.43±6.47	17.00±2.92	4.25±2.14	2.44±0.68	Not found	0.25	0.14	Not found
SPC-A1	Lung adenocarcinoma	14.22±9.27	15.14±2.70	3.22±0.81	3.97±0.81	0.61±0.04	0.21	0.26	0.04
H1299	Lung large cell carcinoma	20.37±2.76	5.61±0.88	2.44±1.62	0.46±0.02	Not found	0.44	0.08	Not found
PAa	Lung adenocarcinoma	21.42±3.57	14.80±3.73	4.25±1.17	1.98±1.61	Not found	0.29	0.13	Not found

hTERT: human telomerase reverse transcriptase.

^*The means±standard deviation of duplicate determinations.

^#The means±standard deviation of triplicate determinations.

^★It was calculated by dividing the relative expression value of the overall transcripts by that of each deletion.