title: Serial monitoring of T315I BCR-ABL mutation by Invader assay combined with RT-PCR.
abstract: We recently developed an Invader assay combined with reverse transcriptase polymerase-chain-reaction in order to quantify T315I bcr-abl transcripts. Using this assay, we serially monitored T315I bcr-abl transcripts in chronic myeloid leukemia (CML) patients whose bcr-abl transcripts were still detectable at 6 months after starting imatinib therapy. Although, we continued to monitor bcr-abl transcripts in 14 CML patients (13 chronic phases and 1 accelerated phase) for up to 12 months, there were no patients who were apparently resistant to imatinib due to the T315I mutation. In contrast, in a case of Philadelphia chromosome-positive acute lymphoid leukemia being treated with chemotherapy including imatinib, we monitored both wild-type and T315I bcr-abl transcripts, and found increased levels of T315I transcripts during relapse (0% at the time of diagnosis and 54.8% at relapse). Thus, our new approach could be a useful tool to study the kinetics of mutant clones and the pharmacokinetics of drug resistance with regard to the T315I mutation.
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8677, Japan.
authors.forename: Masahide
authors.initials: M
authors.lastname: Yamamoto
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8677, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Kakihana
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8677, Japan. k.ohashi@cick.jp.
authors.forename: Kazuteru
authors.initials: K
authors.lastname: Ohashi
authors.affiliation: Development of Clinical Genomics, BML, Saitama, Japan.
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Yamaguchi
authors.affiliation: Development of Clinical Genomics, BML, Saitama, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Tadokoro
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8677, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Akiyama
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8677, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Sakamaki