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Asparaginase is not absorbed from the GI tract and therefore must be administered parenterally. Repeated administration of asparaginase initially produces cumulative plasma concentrations which plateau after several doses. In one study, maximum plateau serum concentrations measured just prior to the daily dose averaged 14.5 units/mL in children and 26.7 units/mL in adults given 1000 units of asparaginase per kg iv daily. With iv doses of 5000 units/kg daily, maximum plateau serum concentrations averaged 50 units/mL in children and 70 units/mL in adults. In one patient, plateau plasma concentrations following alternate-day im administration were slightly less than half those following daily iv administration. In some patients, plasma asparaginase concentrations decrease despite continued administration of the drug. Measurable plasma concentrations of the drug persist for up to 22 days after discontinuing daily asparaginase therapy.
Following an initial iv dose of asparaginase, if resistance does not occur, blood asparagine concentrations fall almost immediately to undetectable concentrations and remain unmeasurable as long as therapy is continued. Following cessation of therapy, asparagine reappears in the plasma within 23-33 days. Blood glutamine concentrations also fall to undetectable concentrations after initiation of asparaginase therapy and begin to return to normal when therapy is discontinued. In one study, glutamine (but not asparagine) concentrations returned to normal in patients receiving asparaginase maintenance dosages of 10-50 units/kg daily.
In a study in patients with metastatic cancer and leukemia, daily intravenous administration of L-asparaginase resulted in a cumulative increase in plasma levels. ... Apparent volume of distribution was slightly greater than the plasma volume. Asparaginase levels in cerebrospinal fluid were less than 1% of concurrent plasma levels.
来源:Hazardous Substances Data Bank (HSDB)
文献信息
REPROGRAMMING EFFECTOR PROTEIN INTERACTIONS TO CORRECT EPIGENETIC DEFECTS IN CANCER
申请人:British Columbia Cancer Agency Branch
公开号:EP2819662B1
公开(公告)日:2019-04-10
US9552457B2
申请人:——
公开号:US9552457B2
公开(公告)日:2017-01-24
[EN] REPROGRAMMING EFFECTOR PROTEIN INTERACTIONS TO CORRECT EPIGENETIC DEFECTS IN CANCER<br/>[FR] REPROGRAMMATION D'INTERACTIONS ENTRE PROTÉINES EFFECTRICES POUR CORRIGER DES DÉFAUTS ÉPIGÉNÉTIQUES DANS LE CANCER
申请人:BRITISH COLUMBIA CANCER AGENCY
公开号:WO2013127011A1
公开(公告)日:2013-09-06
Methods of "reprogramming" epigenetic mark readers or erasers to recognize epigenetic marks other than their cognate (or natural) marks are provided. Reprogramming the reader or eraser can offset the effects of aberrant writer activity (for example, loss of function or overactivity) that can contribute to certain diseases states, such as cancer. The use of the reprogramming compounds identified by these methods in the treatment of such disease states is also provided. Exemplary mark readers that can be targeted by these methods include BPTF and CBX2.