Hypoglycemia associated with L-asparaginase in acute lymphoblastic leukemia treatment: a case report
© Tanaka et al.; licensee BioMed Central Ltd. 2012
Received: 18 March 2012
Accepted: 19 March 2012
Published: 19 April 2012
A patient with acute lymphoblastic leukemia repeatedly developed hypoglycemia during chemotherapy. Comparison of serum glucose trends between chemotherapy with and without L-asparaginase (L-Asp) demonstrated a strong association between L-Asp and hypoglycemia. Critical blood sampling during hypoglycemia indicated hyperinsulinism, suggesting that L-Asp induced hypoglycemia in the patient through inappropriate insulin secretion. Identification of hypoglycemia as an adverse effect will enable clinicians to understand and develop appropriate strategies for L-Asp use in chemotherapy regimens.
KeywordsL-asparaginase Fasting hypoglycemia Hyperinsulinism Acute lymphoblastic leukemia Fasting Glucose levels
The enzyme L-asparaginase (L-Asp) has been commonly used for treatment of childhood acute lymphoblastic leukemia (ALL) for more than 30 years [1–3]. Because of its unique pharmacological features and historically improved treatment outcomes, L-Asp forms an essential part of ALL regimens worldwide . However, many adverse effects of L-Asp have been documented, such as coagulopathy, acute pancreatitis, allergic reaction, hyperlipidemia, hyperammonemia, hepatotoxicity, and hyperglycemia [5–8]. Therefore, clinicians must carefully monitor patients treated with L-Asp for these adverse effects. Until date, hypoglycemia has not been formally reported as an adverse effect of L-Asp. We report, for the first time, a case of hypoglycemia associated with L-Asp use.
TCCSG L99-15 intensification-1, including high-dose cytarabine, methylprednisolone, L-Asp, and triple intrathecal injection, was started with daily imatinib. Thereafter, HR blocks of Berlin–Frankfurt–München (BFM) 2000 were administered. The HR blocks included cytarabine, etoposide, methotrexate, vindesine, ifosfamide, daunorubicin, cyclophosphamide, dexamethasone, and L-Asp . Daily dasatinib was included in the HR blocks instead of imatinib to avoid allergic reaction during TCCSG intensification-1. L-Asp was administered on day 5 of intensification-1 and days 6 and 11 of the HR block therapy. During early treatment days before L-Asp administration, the patient repeatedly developed fasting hyperglycemia (glucose, up to 132 mg/dL). After L-Asp administration, she repeatedly experienced fasting hypoglycemia and was provided with supplemental food and intravenous fluid containing dextrose to prevent severe hypoglycemia.
At the end of the third HR block, she suffered acute pancreatitis. When chemotherapy was resumed after 2 weeks of treatment for pancreatitis, L-Asp was excluded from protocol III of BFM 2000 (reinduction therapy), which included dexamethasone, vincristine, doxorubicin, cyclophosphamide, cytarabine, mercaptopurine, and intrathecal methotrexate administration. During protocol III, the patient did not experience hypoglycemia and had relatively high fasting glucose levels, up to 114 mg/dL (Figure 1).
We confirmed that L-Asp activity was therapeutic during fasting hypoglycemia in the first HR block. L-Asp activity was 0.709 U/mL on day 10, 0.674 U/mL on day 11, and 1.78 U/mL on day 12, where 25000 U/m2 of L-Asp was administered on days 6 and 11. L-Asp activity was measured using the enzyme coupling methods described by Tsurusawa et al. [13, 14]. L-Asp activity above 0.1 U/mL was generally considered therapeutic. The detection limit of this method was 0.002 U/mL.
During ALL treatment, glucose levels are routinely monitored because many patients develop hyperglycemia, presumably because of glucocorticoids and L-Asp. Unexpectedly, our patient experienced repeated fasting hypoglycemia during induction therapy, intensification-1, and HR block therapy. From induction through HR block therapy, L-Asp and steroids were both used and hypoglycemia was always observed after L-Asp use. Given the time relation between L-Asp administration and hypoglycemia, we hypothesized that our patient experienced L-Asp–induced hypoglycemia. Firstly, we compared fasting glucose levels with L-Asp and without L-Asp during induction (Student T-test), showing that those with L-Asp were significantly lower. After HR block therapy, L-Asp was excluded from protocol III because of the development of pancreatitis. Then, we compared fasting glucose levels during induction and first half of protocol III, the same backbone of treatment with and without L-Asp, respectively.
The following questions are to be answered: 1) How does L-Asp induce hypoglycemia? 2) Is there any use of other agents that might affect fasting glucose levels? 3) Why has hypoglycemia not been commonly seen or reported?
In response to the first question, inappropriate insulin secretion, normal free fatty acids, and low ketone bodies during severe hypoglycemia indicated hyperinsulinism, suggesting that L-Asp induced hypoglycemia through insulin hypersecretion. Regarding the second question, besides L-Asp use, there were the following differences between induction therapy and day 1–16 of protocol III; doxorubicin was used in protocol III instead of daunorubicin in induction therapy, and dasatinib was used in protocol III but not in induction therapy. Dasatinib has been not documented to cause the adverse effect of hyperglycemia or hypoglycemia. There was no use of other drugs that potentially induce hypoglycemia or hyperglycemia during these periods, such as non-steroidal anti-inflammatory drugs, antibacterial agents, or imatinib . To the third question, there are few reports focusing on fasting glucose levels in the morning [6, 7]. Glucocorticoids are known to induce hyperglycemia through insulin resistance and gluconeogenesis during induction therapy for childhood ALL . We suspect that parallel use of glucocorticoids may mask the hypoglycemic effect of L-Asp. Since different glucocorticoid agents were used in these two regimens, we treated glucocorticoids as an independent parameter with glucocorticoid potency conversion. Linear regression model showed a significant L-Asp hypoglycemic effect as well as glucocorticoid hyperglycemic effect. There was no significant interaction between L-Asp and glucocorticoids. There remains a concern with validity of glucocorticoid potency conversion for hyperglycemic effect. To overcome the limitation of this case report, further clinical data focusing on hypoglycemia are needed.
Use of L-Asp has recently become even more common in the adult ALL regimens . We believe that in addition to the effect of L-Asp on leukemic cells, it is important to pay more attention to its pharmacological features and physiological mechanisms. Greater knowledge of these effects will enable clinicians to understand and develop appropriate strategies for L-Asp use in chemotherapy regimens.
Written informed consent was obtained from the patient’s guardian for publication of this case report. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
Acute lymphoblastic leukemia
Tokyo Children’s Cancer Study Group
We appreciate Mr. Haruki Honda for assisting in clinical data collection as a medical student.
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