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  • 1
    ISSN: 1569-8041
    Keywords: BEACOPP ; chemotherapy ; dose intensification ; hematotoxicity ; Hodgkin's disease ; practicability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background:Evidence is recently accumulating that the novelBEACOPP (bleomycin (B), etoposide (E), adriamycin (A), cyclophosphamide (C),vincristine (O), procarbazine (P), prednisone (P)) chemotherapy is a highlyeffective treatment for advanced stage Hodgkin's disease. Two dose variantsof BEACOPP are currently tested in a phase III randomized multicenter trialof the GHSG. To enable more extensive testing of BEACOPP we characterized itspracticability regarding schedule adherence, acute hematotoxicity and need forsupportive treatment. Patients and methods:Data of 858 patients (6592 therapy cycles)from 184 participating institutions were evaluated. Planned total drug dosesof the baseline variant (arm 1) were 80, 2400, 200, 5200, 11.2, 5600 and 4480mg/m2 for B, E, A, C, O, P and P, respectively. Compared to arm 1,the doses of E, A and C in the dose-intensified variant (arm 2) were escalatedby factor 2.0, 1.4, 1.92, respectively, using G-CSF assistance. Stepwise dosereductions were specified in case of dose-limiting toxicities. Both variantsare given in eight three-weekly courses. Results:Median dose adherence (dose actually given relative toplanned arm 1 dose) in arm 1 was 1.0 for all drugs. Relative dose escalationof E, A, and C actually maintained in arm 2 was 1.83, 1.37 and 1.77 (medians),respectively, and 70% of patients maintained elevated dose levelsthroughout the entire treatment. Dose-limiting toxicities occurred in25% of cycles in arm 2, most frequently due to leukocytopenia andthrombocytopenia. Time courses of leukocytes in arm 2 showed more severe butnot more prolonged leukocytopenia compared with arm 1. WHO grades 3–4infections were documented in 2.1% (arm 1) and 3.1% (arm 2) ofall cycles. Erythrocytes were transfused in 6% (arm 1) and 28%(arm 2), platelets in 〈1% (arm 1) and 6% (arm 2) of allcycles. Conclusions:Both BEACOPP schemes are practicable in a largemulticenter setting. Despite increased hematotoxicity, moderate doseescalation is safe for the majority of the patients with G-CSF assistance andstandard supportive treatment.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2242
    Keywords: Sample size ; Quantitative trait loci ; Genotype ; Phenotypic classification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this paper we determine the minimum progeny sample size n needed to obtain, with probability α, at least m individuals of a desired two-locus genotype ℊ affecting quantitative traits. The two quantitative trait loci (QTLs) of interest may be linked or independent, with or without epistatic interaction between them. Parental genotypes may be known or unknown, and gene action at either locus may range from additive to overdominance. To reduce the required sample size, mating patterns that will produce a high proportion of desired progeny are suggested for different progeny genotypes and dominance levels. Based on the assumption of normally distributed quantitative trait expression, individuals can be classified into a genotype or genotypic group according to their phenotypic expressions. This technique is used to select both parents and progeny with unknown genotypes. Choice of parental classification criteria for a given quantitative trait affects classification accuracy, and hence the probability of obtaining progeny of the desired genotype. The complexity of this probability depends on the dominance level at each locus, the recombination fraction, and the awareness of parental genotypes. The procedure can be expanded to deal with more than two loci.
    Type of Medium: Electronic Resource
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