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CYP1A2 - a novel genetic marker for early aromatase inhibitor response in the treatment of breast cancer patients

Simonsson, Maria LU ; Veerla, Srinivas LU ; Markkula, Andrea LU ; Rose, Carsten LU ; Ingvar, Christian LU and Jernström, Helena LU (2016) In BMC Cancer 16(1).
Abstract

BACKGROUND: Endocrine resistance is a major obstacle to optimal treatment effect in breast cancer. Some genetic markers have been proposed to predict response to aromatase inhibitors (AIs) but the data is insufficient. The aim of the study was to find new genetic treatment predictive markers of AIs.

METHODS: The ongoing population-based BC-blood study in Lund, Sweden includes women with primary breast cancer. This paper is based on AI-treated patients with estrogen receptor positive tumors who underwent breast cancer surgery in 2002-2008. First, an exploratory analysis of 1931 SNPs in 227 genes involved in absorption, distribution, metabolism, and elimination of multiple medications, using DMET™ chips, was conducted in a subset of... (More)

BACKGROUND: Endocrine resistance is a major obstacle to optimal treatment effect in breast cancer. Some genetic markers have been proposed to predict response to aromatase inhibitors (AIs) but the data is insufficient. The aim of the study was to find new genetic treatment predictive markers of AIs.

METHODS: The ongoing population-based BC-blood study in Lund, Sweden includes women with primary breast cancer. This paper is based on AI-treated patients with estrogen receptor positive tumors who underwent breast cancer surgery in 2002-2008. First, an exploratory analysis of 1931 SNPs in 227 genes involved in absorption, distribution, metabolism, and elimination of multiple medications, using DMET™ chips, was conducted in a subset of the cohort with last follow-up in December 31(st) 2011 (13 cases, 11 controls). Second, selected SNPs from the first analysis were re-analyzed concerning risk for early breast cancer events in the extended cohort of 201 AI-treated with last follow-up in June 30(th) 2014. Clinical data were obtained from medical records and population registries.

RESULTS: Only CYP1A2 rs762551 C-allele was significantly associated with increased risk for early events in the 24 patients (P = 0.0007) and in the extended cohort, adjusted Hazard ratio (HR) 2.22 (95 % CI 1.03-4.80). However, the main prognostic impact was found within five years, adjusted HR 7.88 (95 % CI 2.13-29.19). The impact of the CYP1A2 rs762551 C-allele was modified by a functional polymorphism in the regulator gene AhR Arg554Lys (G > A). Compared to patients who were homozygous for the major allele in both genes (CYP1A2 A/A and AhR G/G), a 9-fold risk for early events was found in patients who had at least one minor allele in both genes, adjusted HR 8.95 (95 % CI 2.55-31.35), whereas patients with at least one minor allele in either but not both genes had a 3-fold risk for early events, adjusted HR 2.81 (95 % CI 1.07-7.33). The impact of CYP1A2 rs762551 C-allele was also modified by the CYP19A1 rs4646 C/C, adjusted HR 3.39 (95 % CI 1.60-7.16) for this combination. This association was strongest within the first five years, adjusted HR 10.42 (95 % CI 3.45-31.51).

CONCLUSION: CYP1A2 rs762551 was identified as a new potential predictive marker for early breast cancer events in AI-treated breast cancer patients. Moreover, combined genotypes of CYP1A2 rs762551 and CYP19A1 rs4646 or AhR Arg554Lys could further improve prediction of early AI-treatment response. If confirmed, these results may provide a way to more personalized medicine.

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organization
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type
Contribution to journal
publication status
published
subject
in
BMC Cancer
volume
16
issue
1
publisher
BioMed Central
external identifiers
  • WOS:000373329200001
  • Scopus:84977549945
ISSN
1471-2407
DOI
10.1186/s12885-016-2284-3
language
English
LU publication?
yes
id
569cabc3-4c09-43f8-ad5b-0cbcd974cb0a
date added to LUP
2016-04-25 15:24:52
date last changed
2016-10-27 16:10:28
@misc{569cabc3-4c09-43f8-ad5b-0cbcd974cb0a,
  abstract     = {<p>BACKGROUND: Endocrine resistance is a major obstacle to optimal treatment effect in breast cancer. Some genetic markers have been proposed to predict response to aromatase inhibitors (AIs) but the data is insufficient. The aim of the study was to find new genetic treatment predictive markers of AIs.</p><p>METHODS: The ongoing population-based BC-blood study in Lund, Sweden includes women with primary breast cancer. This paper is based on AI-treated patients with estrogen receptor positive tumors who underwent breast cancer surgery in 2002-2008. First, an exploratory analysis of 1931 SNPs in 227 genes involved in absorption, distribution, metabolism, and elimination of multiple medications, using DMET™ chips, was conducted in a subset of the cohort with last follow-up in December 31(st) 2011 (13 cases, 11 controls). Second, selected SNPs from the first analysis were re-analyzed concerning risk for early breast cancer events in the extended cohort of 201 AI-treated with last follow-up in June 30(th) 2014. Clinical data were obtained from medical records and population registries.</p><p>RESULTS: Only CYP1A2 rs762551 C-allele was significantly associated with increased risk for early events in the 24 patients (P = 0.0007) and in the extended cohort, adjusted Hazard ratio (HR) 2.22 (95 % CI 1.03-4.80). However, the main prognostic impact was found within five years, adjusted HR 7.88 (95 % CI 2.13-29.19). The impact of the CYP1A2 rs762551 C-allele was modified by a functional polymorphism in the regulator gene AhR Arg554Lys (G &gt; A). Compared to patients who were homozygous for the major allele in both genes (CYP1A2 A/A and AhR G/G), a 9-fold risk for early events was found in patients who had at least one minor allele in both genes, adjusted HR 8.95 (95 % CI 2.55-31.35), whereas patients with at least one minor allele in either but not both genes had a 3-fold risk for early events, adjusted HR 2.81 (95 % CI 1.07-7.33). The impact of CYP1A2 rs762551 C-allele was also modified by the CYP19A1 rs4646 C/C, adjusted HR 3.39 (95 % CI 1.60-7.16) for this combination. This association was strongest within the first five years, adjusted HR 10.42 (95 % CI 3.45-31.51).</p><p>CONCLUSION: CYP1A2 rs762551 was identified as a new potential predictive marker for early breast cancer events in AI-treated breast cancer patients. Moreover, combined genotypes of CYP1A2 rs762551 and CYP19A1 rs4646 or AhR Arg554Lys could further improve prediction of early AI-treatment response. If confirmed, these results may provide a way to more personalized medicine.</p>},
  author       = {Simonsson, Maria and Veerla, Srinivas and Markkula, Andrea and Rose, Carsten and Ingvar, Christian and Jernström, Helena},
  issn         = {1471-2407},
  language     = {eng},
  number       = {1},
  publisher    = {ARRAY(0x8f710c8)},
  series       = {BMC Cancer},
  title        = {CYP1A2 - a novel genetic marker for early aromatase inhibitor response in the treatment of breast cancer patients},
  url          = {http://dx.doi.org/10.1186/s12885-016-2284-3},
  volume       = {16},
  year         = {2016},
}