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Studies assess genetics, modified treatment to improve outcomes, reduce toxicity
Date:12/8/2012

, leading to a shortage of normal white and red blood cells and platelets in the blood, which is associated with clotting defects that can cause serious bleeding. Without prompt diagnosis and treatment, APL can be fatal in a matter of hours or days.

Early treatment regimens for APL relied heavily on anthracycline-based chemotherapy with daunorubicin or idarubicin. In the early 1990s, research supported the addition of a non-chemotherapeutic agent, all-trans-retinoic acid (ATRA, a vitamin A derivative developed from ancient Chinese herbal medicine), to standard regimens. ATRA causes cancer cells to develop fully into mature blood cells, which progress through full differentiation and eventually die (unlike leukemia cells that are unable to fully mature). The combination regimen of chemotherapy and ATRA dramatically improved the survival outlook for those with APL and made the disease curable in up to 80 percent of patients. More recently, another natural compound, arsenic trioxide (ATO), was integrated into APL treatment, showing higher efficacy and better tolerability when compared with conventional chemotherapy. Today, as investigators continue to report the success of targeted cancer therapies (best exemplified by imatinib for chronic myeloid leukemia), researchers have questioned whether traditional toxic chemotherapy is still necessary to achieve high cure rates for patients with APL.

To investigate whether a combination of ATO+ATRA could provide the same therapeutic benefit as conventional treatment including chemotherapy, researchers from the Italian-German cooperative teams Gruppo Italiano Malattie EMatologiche dell'Adulto (GIMEMA), Study Alliance Leukemia (SAL) group, and German-Austrian AML Study Group (AMSLG) designed a multicenter, international Phase III trial in which 162 patients with standard-risk APL were divided into two treatment arms. Patients in Arm A received a regimen of ATO+ATRA, while patients in Arm B received the standard
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Contact: Andrea Slesinski
aslesinski@hematology.org
614-352-5096
American Society of Hematology
Source:Eurekalert

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