Abstract:It is difficult to draw conclusions about the effectiveness of technologies for reducing or preventing cardiotoxicity and about the use of cardiac markers in children as the evidence is limited in quantity and quality. The lack of standardisation for monitoring and reporting cardiac performance is problematic. Not all studies report effectiveness in terms of cardiac outcomes and event-free survival with supporting statistical analyses. Studies are mostly small and of short duration, making generalisation diffi… Show more
“…There is no agreement on the optimal method to assess and no standardization of reporting or outcome measures in studies of cardioprotection during anthracycline use. 6 Lipshultz et al 4 described the use of cardiac troponin T as a sensitive and specific marker of early myocardial injury was superior to echocardiography in children with ALL. The measure of troponin T levels is not available in every clinical setting.…”
Cardiotoxicity is frequently present with anthracycline treatment. Most acute myeloid leukemia (AML) protocols use anthracyclines. Dexrazoxane has cardioprotective activity. The aim of this study was to evaluate cardioprotection of dexrazoxane in a prospective study. Fifty pediatric AML patients were treated with a Medical Research Council AML 10 modified protocol with dexrazoxane previous to any anthracycline dose. Cardiac function was evaluated at diagnosis, before every cycle, and every 6 months after the end of chemotherapy. Accumulative doses of anthracycline reached 424 mg/m (150 to 850 mg/m). Forty-eight patients (96%) received a dose higher than 300 mg/m. Twenty-eight percent had a grade of cardiotoxicity (24% grade 1 and 4% grade 2). Non 3 or 4 grade cardiotoxicity was seen. Cumulated anthracycline doses did not correlated with cardiotoxicity (P=0.815). The event-free survival was 53%, 15.7% died of disease, and 11.8% died free of leukemia. There is still not an agreement for the optimal method to reduce cardiotoxicity in children receiving anthracyclines. In our study, we could conclude that the use of dexrazoxane was effective cardioprotectant to allow a high-dose of anthracycline therapy. A randomized study is necessary to consolidate this asseveration.
“…There is no agreement on the optimal method to assess and no standardization of reporting or outcome measures in studies of cardioprotection during anthracycline use. 6 Lipshultz et al 4 described the use of cardiac troponin T as a sensitive and specific marker of early myocardial injury was superior to echocardiography in children with ALL. The measure of troponin T levels is not available in every clinical setting.…”
Cardiotoxicity is frequently present with anthracycline treatment. Most acute myeloid leukemia (AML) protocols use anthracyclines. Dexrazoxane has cardioprotective activity. The aim of this study was to evaluate cardioprotection of dexrazoxane in a prospective study. Fifty pediatric AML patients were treated with a Medical Research Council AML 10 modified protocol with dexrazoxane previous to any anthracycline dose. Cardiac function was evaluated at diagnosis, before every cycle, and every 6 months after the end of chemotherapy. Accumulative doses of anthracycline reached 424 mg/m (150 to 850 mg/m). Forty-eight patients (96%) received a dose higher than 300 mg/m. Twenty-eight percent had a grade of cardiotoxicity (24% grade 1 and 4% grade 2). Non 3 or 4 grade cardiotoxicity was seen. Cumulated anthracycline doses did not correlated with cardiotoxicity (P=0.815). The event-free survival was 53%, 15.7% died of disease, and 11.8% died free of leukemia. There is still not an agreement for the optimal method to reduce cardiotoxicity in children receiving anthracyclines. In our study, we could conclude that the use of dexrazoxane was effective cardioprotectant to allow a high-dose of anthracycline therapy. A randomized study is necessary to consolidate this asseveration.
“…The potential long-term cardiac risk that results from anthracycline-containing chemotherapy is relatively wellstudied in children, 39 but it is less well-studied in adult patients with cancer, particularly in the elderly population. Our study sought to examine whether anthracyclinebased or nonanthracycline-based chemotherapy is Original Article…”
Objective
To identify the autoantigen recognized by the autoantibody that is associated with clinically amyopathic dermatomyositis (CâADM) and rapidly progressive interstitial lung disease (ILD).
Methods
An antiâCADMâ140 antibodyâpositive prototype serum sample was used to screen a HeLa cellâderived complementary DNA (cDNA) library. Selected cDNA clones were further evaluated by immunoprecipitation of their in vitroâtranscribed and in vitroâtranslated products using antiâCADMâ140 antibodyâpositive and antiâCADMâ140 antibodyânegative sera. The lysates of COSâ7 cells transfected with the putative antigen were similarly tested. An enzymeâlinked immunosorbent assay (ELISA) to detect the antiâCADMâ140 antibody was established using a recombinant CADMâ140 antigen, and its specificity and sensitivity for CâADM and rapidly progressive ILD were assessed in 294 patients with various connective tissue diseases.
Results
By cDNA library screening and immunoprecipitation of in vitroâtranscribed and in vitroâtranslated products, we obtained a cDNA clone encoding melanoma differentiationâassociated gene 5 (MDAâ5). The antiâCADMâ140 antibodies in patients' sera specifically reacted with MDAâ5 protein expressed in cells transfected with fullâlength MDAâ5 cDNA, confirming the identity of MDAâ5 as the CADMâ140 autoantigen. The ELISA, using recombinant MDAâ5 protein as the antigen, showed an analytical sensitivity of 85% and analytical specificity of 100%, in comparison with the âgold standardâ immunoprecipitation assay, and was useful for identifying patients with CâADM and/or rapidly progressive ILD.
Conclusion
Given that RNA helicase encoded by MDAâ5 is a critical molecule involved in the innate immune defense against viruses, viral infection may play an important role in the pathogenesis of CâADM and rapidly progressive ILD. Moreover, our ELISA using recombinant MDAâ5 protein makes detection of the antiâCADMâ140 antibody routinely available.
“…1 However, cardiomyopathy is a dose-limiting complication; cardiac abnormalities develop in up to 60% of patients exposed to high doses of anthracyclines. 2 The dose-dependent increase in cardiomyopathy risk [3][4][5] is modified by younger age at exposure and chest radiation. 6 However, doses as low as 150 mg/m 2 result in cardiomyopathy in some patients, 3 suggesting a role for interindividual variability in anthracycline pharmacodynamics.…”
A B S T R A C T PurposeCarbonyl reductases (CBRs) catalyze reduction of anthracyclines to cardiotoxic alcohol metabolites. Polymorphisms in CBR1 and CBR3 influence synthesis of these metabolites. We examined whether single nucleotide polymorphisms in CBR1 (CBR1 1096GÏŸA) and/or CBR3 (CBR3 V244M) modified the dose-dependent risk of anthracycline-related cardiomyopathy in childhood cancer survivors.
Patients and MethodsOne hundred seventy survivors with cardiomyopathy (patient cases) were compared with 317 survivors with no cardiomyopathy (controls; matched on cancer diagnosis, year of diagnosis, length of follow-up, and race/ethnicity) using conditional logistic regression techniques. 2 ) did not increase the risk of cardiomyopathy. Among individuals with CBR3 V244M homozygous G genotypes (CBR3:GG), exposure to low-to moderate-dose anthracyclines increased cardiomyopathy risk when compared with individuals with CBR3:GA/AA genotypes unexposed to anthracyclines (OR, 5.48; P Ï .003), as well as exposed to low-to moderate-dose anthracyclines (OR, 3.30; P Ï .006). High-dose anthracyclines (ÏŸ 250 mg/m 2 ) were associated with increased cardiomyopathy risk, irrespective of CBR genotype status.
Results
ConclusionThis study demonstrates increased anthracycline-related cardiomyopathy risk at doses as low as 101 to 150 mg/m 2 . Homozygosis for G allele in CBR3 contributes to increased cardiomyopathy risk associated with low-to moderate-dose anthracyclines, such that there seems to be no safe dose for patients homozygous for the CBR3 V244M G allele. These results suggest a need for targeted intervention for those at increased risk of cardiomyopathy.
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