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Hypercoagulability in adolescent girls on oral contraceptives‐global coagulation profile and estrogen receptor polymorphisms
Author(s) -
Zia Ayesha,
Callaghan Michael U.,
Callaghan Joseph H.,
Sawni Anju,
Bartlett Heather,
Backos Alcesa,
Marshall Sharon,
Chitlur Meera,
Rajpurkar Madhvi
Publication year - 2015
Publication title -
american journal of hematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.456
H-Index - 105
eISSN - 1096-8652
pISSN - 0361-8609
DOI - 10.1002/ajh.24064
Subject(s) - estrogen , medicine , combined oral contraceptives , coagulation , estrogen receptor , population , family planning , environmental health , cancer , research methodology , breast cancer
Oral contraceptive (OCP) induced changes on coagulation are complex with high inter‐individual variability. The precise reason for differences in this variability is unknown. We hypothesized that global coagulation assays better delineate these changes and variability in hypercoagulability may be the result of differences in estrogen metabolism and thrombophilia. Fifty‐two adolescents initiating OCPs were prospectively enrolled; 33 subjects completed the study. Samples were analyzed prior to and after OCPs for procoagulant and anticoagulant factor activities and thrombin generation (TG) +/‐thrombomodulin. Participants were genotyped for common thrombophilia and estrogen receptor‐α (ESR‐α) single nucleotide polymorphisms (SNPs). SNP genotypes were compared to coagulation parameters; TG parameters and differences pre and post OCPs were examined. At baseline, a striking finding was elevated FVIII levels. FVL was absent in all and F2 G20210A was present in one participant. The ESR‐α polymorphism was present in heterozygous state in 59% and homozygous state in 21% participants. There were no differences in VWF levels and FVIII: C after being on OCPs. Protein S levels decreased with OCPs. Sixty percent of participants showed evidence of hypercoagulability on TG testing on OCPs. Higher thrombin peak and endogenous thrombin potential (ETP) were seen on TG after OCPs. With thrombomodulin, ETP and thrombin peak did not decrease after OCPs, signifying ‘thrombomodulin resistance’. We demonstrated that OCPs induce a state of “variable” hypercoagulability in adolescents, predominantly through the protein S pathway. Genetic and nongenetic factors may account for the variable increase in hypercoagulability. Further research is needed to understand this. Am. J. Hematol. 90:725–731, 2015. © 2015 Wiley Periodicals, Inc.