Impact of CYP19A1 and ESR1 variants on early-onset side effects during combined endocrine therapy in the TEXT trial

Harriet Johansson, Kathryn P Gray, Olivia Pagani, Meredith M Regan, Giuseppe Viale, Valentina Aristarco, Debora Macis, Antonella Puccio, Susanne Roux, Rudolf Maibach, Marco Colleoni, Manuela Rabaglio, Karen N Price, Alan S Coates, Richard D Gelber, Aron Goldhirsch, Roswitha Kammler, Bernardo Bonanni, Barbara A Walley, the TEXT principal investigators, Harriet Johansson, Kathryn P Gray, Olivia Pagani, Meredith M Regan, Giuseppe Viale, Valentina Aristarco, Debora Macis, Antonella Puccio, Susanne Roux, Rudolf Maibach, Marco Colleoni, Manuela Rabaglio, Karen N Price, Alan S Coates, Richard D Gelber, Aron Goldhirsch, Roswitha Kammler, Bernardo Bonanni, Barbara A Walley, the TEXT principal investigators

Abstract

Background: Single nucleotide polymorphisms (SNPs) in the estrogen receptor 1 (ESR1) and cytochrome P450 19A1 (CYP19A1) genes have been associated with breast cancer risk, endocrine therapy response and side effects, mainly in postmenopausal women with early breast cancer. This analysis aimed to assess the association of selected germline CYP19A1 and ESR1 SNPs with early-onset hot flashes, sweating and musculoskeletal symptoms in premenopausal patients enrolled in the Tamoxifen and Exemestane Trial (TEXT).

Methods: Blood was collected from consenting premenopausal women with hormone-responsive early breast cancer, randomly assigned to 5-years of tamoxifen plus ovarian suppression (OFS) or exemestane plus OFS. DNA was extracted with QIAamp kits and genotyped for two CYP19A1 (rs4646 and rs10046) and three ESR1 (rs2077647, rs2234693 and rs9340799) SNPs by a real-time pyrosequencing technique. Adverse events (AEs) were recorded at baseline and 3-monthly during the first year. Associations of the genotype variants with grade ≥2 early-onset targeted AEs of hot flashes/sweating or musculoskeletal events were assessed using logistic regression models.

Results: There were 2660 premenopausal patients with breast cancer in the intention-to-treat population of TEXT, and 1967 (74 %) are included in this translational study. The CYP19A1 rs10046 variant T/T, represented in 23 % of women, was associated with a reduced incidence of grade ≥2 hot flashes/sweating (univariate odds ratio (OR) = 0.78; 95 % CI 0.63-0.97; P = 0.03), more strongly in patients assigned exemestane + OFS (TT vs CT/CC: OR = 0.65, 95 % CI = 0.48-0.89) than assigned tamoxifen + OFS (OR = 0.94, 95 % CI = 0.69-1.27, interaction P = 0.03). No association with any of the CYP19A1/ESR1 genotypes and musculoskeletal AEs was found.

Conclusion: The CYP19A1 rs10046 variant T/T favors lower incidence of hot flashes/sweating under exemestane + OFS treatment, suggesting endocrine-mediated effects. Based on findings from others, this SNP may potentially enhance treatment adherence and treatment efficacy. We plan to evaluate the clinical impact of this polymorphism during time, pending sufficient median follow up.

Trial registration: ClinicalTrials.gov NCT00066703, registered August 6, 2003.

Keywords: Aromatase inhibitors; Breast cancer; CYP19A1; ESR1; Ovarian suppression; Side effects; Tamoxifen.

Figures

Fig. 1
Fig. 1
Derivation of the Tamoxifen and Exemestane Trial (TEXT) translational cohort from the intention-to-treat (ITT) population. The translational cohort includes patients whose blood was available for DNA analysis. GNRHa triptorelin was required for the first 6 months, any time after which the patient could choose to undergo bilateral oophorectomy or bilateral ovarian radiotherapy. E exemestane, T tamoxifen, OFS ovarian function suppression, LFU lost to follow up, CRF case report form

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