Table 2. MLV-positive cell lines tested by nested PCR and PERT-PCR assays.

Cell line	Cell type	MLV-PCR		control PCR		PERT-PCR
		1st rd	2nd rd	ABL	IAP	Mg2+	Mn2+
22RV1	prostate cancer	+	+	+	-	+	+
AC-1M46	choriocarcinoma-trophoblast hybrid	-	+	+	-	(+)	+
BT-B	cervix carcinoma (subclone of HELA)	+	+	+	-	-	+
CML-T11	T-cell leukemia	- / -	+ / -	+ / +	+ / -	-	-
COLO-677	small cell lung carcinoma	+	+	+	-	(+)	+
DEL	malignant histiocytosis	+	+	+	-	-	+
EVSA-T	breast carcinoma	+	+	+	-	+	+
HN1	oral squamous carcinoma	- / -	+ / -	+ / +	+ / -	n.d.	n.d.
KARPAS-1106P	B-cell non-Hodgkin lymphoma	+	+	+	-	-	-
KELLY	neuroblastoma	-	+	+	-	+	+
KYSE-70	esophageal carcinoma	+	+	+	-	+	+
LAMA-87	chronic myeloid leukema	+	+	+	-	+	+
LCL-HO	B-lymphoblastoid cells	(+)	+	+	-	+	+
LXF-289	lung adenocarcinoma	+	+	+	-	+	+
M07e1	acute megakaryoblastic leukemia	+ / -	+ / -	+ / +	+ / -	n.d.	n.d.
ML-1	follicular thyroid carcinoma	-	+	+	-	+	+
NAMALWA.CSN/70	Burkitt lymphoma (subclone)	+	+	+	-	+	+
NAMALWA.KN2	Burkitt lymphoma (subclone)	+	+	+	-	+	+
NCEB-1	mantle cell lymphoma	+	+	+	+*	-	+
SCLC-21H	small lung cell carcinoma	+	+	+	-	+	+
SK-GT-2	gastric fundus carcinoma	+	+	+	-	+	+
SK-MEL-1	melanoma	-	+	+	-	-	-
SPI-8011	chronic myeloid leukemia (K-562)	(+) / -	+ / -	+ / +	+ / -	-	-

* The NCEB-1 cell line is known to harbor several mouse chromosomes in the nuclei of the human cells;-, negative; (+), weakly positive; +, positive; ¹human genomic DNA samples contaminated with mouse derived DNA (new DNA preparations revealed MLV and IAP negative and ABL positive results). n.d. not determined.