Functionally active duplications of the CYP2D6 gene are more prevalent among larynx and lung cancer patients.

Abstract:

:The cytochrome P450 CYP2D6 is a polymorphic drug-metabolizing enzyme that is involved in the metabolism of several drugs and xenobiotics. Several independent studies indicate that the CYP2D6 metabolic status is a secondary factor in the risk of developing lung cancer, with individuals with high activity being at increased risk. The occurrence of functionally active duplications of the CYP2D6 gene is a phenomenon that affects 3-8% of Caucasians and up to 30% in some ethnic groups. These duplications cause ultrarapid metabolism of CYP2D6 substrates. In order to establish whether the highest CYP2D6 enzyme activity is associated with an increased risk of cancer, we analyzed the frequency of CYP2D6 gene duplications and enzyme-inactivating mutations in 199 Caucasian patients with lung or larynx cancer and in 335 healthy controls. A significantly increased frequency of carriers of the CYP2D6 gene duplication were found among lung and larynx cancer patients (13%), as compared with healthy controls (6.9%; p < 0.02). The frequency of the mutated active CYP2D6*9 allele was increased in lung cancer patients (p < 0.01) but not in larynx cancer patients. Global findings indicate that over 20% patients with lung or larynx cancer show CYP2D6 genotypes leading to ultrarapid metabolism or to the expression of an enzyme with altered kinetics (p < 0.01 vs. healthy controls). This may influence the metabolism of CYP2D6 substrates, including antineoplastic drugs and opioid derivatives used for pain relief in cancer patients. These patients would require higher doses than those considered as standard. We conclude that dosages for CYP2D6 substrates should be adapted to lung and larynx cancer patients.

journal_name

Oncology

journal_title

Oncology

authors

Agúndez JA,Gallardo L,Ledesma MC,Lozano L,Rodriguez-Lescure A,Pontes JC,Iglesias-Moreno MC,Poch J,Ladero JM,Benítez J

doi

10.1159/000055354

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

59-63

issue

1

eissn

0030-2414

issn

1423-0232

pii

55354

journal_volume

61

pub_type

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