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. 1989 Sep;60(3):339-42.
doi: 10.1038/bjc.1989.282.

Amplification and expression of mdr1 gene in a multidrug resistant variant of small cell lung cancer cell line NCI-H69

J G Reeve  1 , P H Rabbitts, P R Twentyman
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Free PMC article

Amplification and expression of mdr1 gene in a multidrug resistant variant of small cell lung cancer cell line NCI-H69

J G Reeve et al. Br J Cancer. 1989 Sep.
Free PMC article

Abstract

Amplification and expression of the mdr1 gene encoding P-glycoprotein have been studied in H69/LX4 a multidrug resistant variant (MDR) of small cell lung cancer (SCLC) cell line NCI-H69. Recently a second independently derived MDR variant of this cell line designated H69/AR was found by others not to show amplification, rearrangement or over-expression of the mdr1 gene. The present study reports that in marked contrast to H69/AR, H69/LX4 shows amplification and expression of the P-glycoprotein gene and raises the possibility that P-glycoprotein hyperexpression may be a clinically relevant component of MDR in some SCLC tumours.

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