Acquired loss of CYP2C19 activity occurs in a substantial proportion of patients with multiple myeloma. This indicates that the previously reported phenomenon is not limited to patients with solid tumours. Thus, measurement of CYP2C19 activity rather than CYP2C19 genotype may be more clinically relevant for the determination of whether loss of CYP2C19 function adversely influences the toxicity and efficacy of certain drugs used in medical oncology.
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