Glucocorticoids play a major role in the treatment of acute lymphoblastic leukemia (ALL).21 Supraphysiological doses of glucocorticoids may, however, suppress the hypothalamus-pituitary-adrenal (HPA) axis and consequently lead to an impaired stress response and an inadequate host defense against infections, which remains a cause of morbidity and death.3 The duration of adrenal insufficiency after cessation of glucocorticoids is known to show considerable inter-individual variation.64
A large number of polymorphisms in the glucocorticoid receptor (GR) gene (NR3C1), which is located on chromosome 5, are known. The ER22/23EK polymorphism (rs6189 and rs6190, G>A, located on exon 2) and the GR-β polymorphism (rs6198, A>G, located on exon 9β) have both been associated with a relative glucocorticoid resistance.87 In contrast, the N363S polymorphism (rs56149945, previously rs6195, A>G, located in codon 363 of exon 2) and the BclI polymorphism (rs41423247, C>G, located 646 nucleotides downstream from exon 2) have been reported to be associated with an enhanced sensitivity to glucocorticoids.97 We performed a pilot study to explore the relation between the duration of adrenal insufficiency after a 4-week induction course with high-dose prednisone therapy (60 mg/m/day in three doses) with tapering over nine days and the incidence of GR polymorphisms with previously reported altered sensitivity for glucocorticoids in children treated according to the Dutch Childhood Oncology Group ALL 10 or the consecutive ALL 11 protocol.1110
Adrenal function was assessed by the intravenous low-dose (1 mg) ACTH stimulation test using tetracosactrin (Synacthen, Novartis).1312 A normal response was defined as a stimulated serum cortisol of 550 nmol/L or over.13 The first test was performed approximately one week after the last prednisone tapering dose according to the induction course. In case of adrenal suppression, the test was repeated every 2–3 weeks, until normal stimulated cortisol levels were observed or until the end of follow up which was 96 days after the last prednisone dose because of the start of a second high-dose glucocorticoid course.
DNA of the 25 included patients was extracted from leukocytes in peripheral venous blood samples taken during hematologic remission using standard techniques. Genotypes were determined by allelic discrimination using a Taqman ABI Prism 7900HT Sequence Detection System. The Assay-by-Design service (http://www.appliedbiosystems.com) was used to set up a Taqman allelic discrimination assay.14 Table 1 shows the GR genotype distribution; frequencies are similar to those reported previously.15 There was no correlation between patient age and duration of adrenal insufficiency (r=0.24, P=0.24). Figure 1 shows the duration of adrenal insufficiency in childhood ALL patients after induction therapy with high-dose prednisone for the different GR genotypes. The duration of adrenal insufficiency in carriers of ER22/23EK was shorter than in the non-carriers (median 7.0 days (range 6.0–8.0) vs. 28.0 days (range: 6.0–96.0); P=0.03). There was no statistically significant difference in duration of adrenal insufficiency between carriers and non-carriers of GR-β (median 22.0 days (range 6.0–67.0) vs. 42.0 days (range 6.0–96.0) days; P=0.17) nor between patients homozygous for GR-β and non-carriers (median 10.0 days (range 9.0–11.0) vs. 42.0 days (range 6.0–96.0); P=0.21). Because there was only one carrier, the influence of the genotype N363S could not be statistically analyzed. The duration of adrenal insufficiency in patients homozygous for BclI was longer than in patients who were not homozygous for BclI (median 70.5 days (range 26.0–93.0) vs. 22.0 days (range 6.0–96.0); P=0.04).
In conclusion, the duration of adrenal insufficiency after discontinuation of a 4-week high-dose prednisone induction course is affected by GR genotype, which to the best of our knowledge has never been previously reported. The duration of adrenal insufficiency in carriers of the ER22/23EK polymorphism87 was shorter than in non-carriers, indicating a lower susceptibility for developing adrenal insufficiency after high-dose glucocorticoid therapy. Adrenal insufficiency in patients homozygous for BclI97 lasted longer in comparison to patients who were not homozygous for BclI. This indicates that patients homozygous for BclI have an increased susceptibility for prolonged adrenal insufficiency. A clear limitation of this pilot study is the limited number of patients included. Nevertheless, despite the small sample size and the relatively low frequencies of the GR polymorphisms in the general population, we observed statistically significant and clinically relevant associations between certain GR genotypes and the duration of adrenal insufficiency, which are biologically plausible. This indicates that the duration of adrenal insufficiency during treatment for childhood ALL can, at least partially, be attributed to variants of the GR gene that encodes for the protein through which glucocorticoids exert their action.
References
- Planey SL, Litwack G. Glucocorticoid-induced apoptosis in lymphocytes. Biochem Biophys Res Commun. 2000; 279(2):307-12. PubMedhttps://doi.org/10.1006/bbrc.2000.3922Google Scholar
- Kaspers GJ, Veerman AJ, Popp-Snijders C, Lomecky M, Van Zantwijk CH, Swinkels LM. Comparison of the antileukemic activity in vitro of dexamethasone and prednisolone in childhood acute lymphoblastic leukemia. Med Pediatr Oncol. 1996; 27(2):114-21. PubMedhttps://doi.org/10.1002/(SICI)1096-911X(199608)27:2<114::AID-MPO8>3.0.CO;2-IGoogle Scholar
- Shulman DI, Palmert MR, Kemp SF. Adrenal insufficiency: still a cause of morbidity and death in childhood. Pediatrics. 2007; 119(2):484-94. https://doi.org/10.1542/peds.2006-1612Google Scholar
- Felner EI, Thompson MT, Ratliff AF, White PC, Dickson BA. Time course of recovery of adrenal function in children treated for leukemia. J Pediatr. 2000; 137(1):21-4. PubMedhttps://doi.org/10.1067/mpd.2000.107385Google Scholar
- Mahachoklertwattana P, Vilaiyuk S, Hongeng S, Okascharoen C. Suppression of adrenal function in children with acute lymphoblastic leukemia following induction therapy with corticosteroid and other cytotoxic agents. J Pediatr. 2004; 144(6):736-40. PubMedhttps://doi.org/10.1016/j.jpeds.2004.03.033Google Scholar
- Rix M, Birkebaek NH, Rosthoj S, Clausen N. Clinical impact of corticosteroid-induced adrenal suppression during treatment for acute lymphoblastic leukemia in children: a prospective observational study using the low-dose adrenocorticotropin test. J Pediatr. 2005; 147(5):645-50. PubMedhttps://doi.org/10.1016/j.jpeds.2005.06.006Google Scholar
- Manenschijn L, van den Akker EL, Lamberts SW, van Rossum EF. Clinical features associated with glucocorticoid receptor polymorphisms. An overview. Ann NY Acad Sci. 2009; 1179:179-98. PubMedhttps://doi.org/10.1111/j.1749-6632.2009.05013.xGoogle Scholar
- van Rossum EF, Koper JW, Huizenga NA, Uitterlinden AG, Janssen JA, Brinkmann AO. A polymorphism in the glucocorticoid receptor gene, which decreases sensitivity to glucocorticoids in vivo, is associated with low insulin and cholesterol levels. Diabetes. 2002; 51(10):3128-34. PubMedhttps://doi.org/10.2337/diabetes.51.10.3128Google Scholar
- van Rossum EF, Koper JW, van den Beld AW, Uitterlinden AG, Arp P, Ester W. Identification of the BclI polymorphism in the glucocorticoid receptor gene: association with sensitivity to glucocorticoids in vivo and body mass index. Clin Endocrinol. 2003; 59(5):585-92. PubMedhttps://doi.org/10.1046/j.1365-2265.2003.01888.xGoogle Scholar
- Protocol ALL 10. Protocol voor diagnostiek en behandeling van kinderen en adolescenten (1 – 19 jaar) met Acute Lymfatische Leukemie (ALL). 2011. Google Scholar
- Protocol ALL 11. Treatment study protocol of the Dutch Childhood Oncology Group for children and adolescents (1–19 year) with newly diagnosed acute lymphoblastic leukemia. 2013. Google Scholar
- Tordjman K, Jaffe A, Trostanetsky Y, Greenman Y, Limor R, Stern N. Low-dose (1 microgram) adrenocorticotrophin (ACTH) stimulation as a screening test for impaired hypothalamo-pituitary-adrenal axis function: sensitivity, specificity and accuracy in comparison with the high-dose (250 microgram) test. Clin Endocrinol. 2000; 52(5):633-40. PubMedhttps://doi.org/10.1046/j.1365-2265.2000.00984.xGoogle Scholar
- Abdu TA, Elhadd TA, Neary R, Clayton RN. Comparison of the low dose short synacthen test (1 microg), the conventional dose short synacthen test (250 microg), and the insulin tolerance test for assessment of the hypothalamo-pituitary-adrenal axis in patients with pituitary disease. J Clin Endocrinol Metab. 1999; 84(3):838-43. PubMedhttps://doi.org/10.1210/jc.84.3.838Google Scholar
- Manenschijn L, van Rossum EF, Jetten AM, de Rooij SE, van Munster BC. Glucocorticoid receptor haplotype is associated with a decreased risk of delirium in the elderly. Am J Med Genet B Neuropsychiatr Genet. 2011; 156B(3):316-21. https://doi.org/10.1002/ajmg.b.31165Google Scholar
- van Rossum EF, Lamberts SW. Polymorphisms in the glucocorticoid receptor gene and their associations with metabolic parameters and body composition. Recent Prog Horm Res. 2004; 59:333-57. PubMedhttps://doi.org/10.1210/rp.59.1.333Google Scholar