Segmental Erythema Multiforme-Like Drug Eruption by Aromatase Inhibitor Anastrozole - First Case Report and another Example of an Immunocompromised District.
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ABSTRACT:
SUBMITTER: Wollina U
PROVIDER: S-EPMC5816324 | biostudies-other | 2018 Jan
REPOSITORIES: biostudies-other
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Project description:Aromatase inhibitors (AIs) reduce breast cancer recurrence and prolong survival, but up to 30% of patients exhibit recurrence. Using a genome-wide association study of patients entered on MA.27, a phase III randomized trial of anastrozole versus exemestane, we identified a single nucleotide polymorphism (SNP) in CUB And Sushi multiple domains 1 (CSMD1) associated with breast cancer-free interval, with the variant allele associated with fewer distant recurrences. Mechanistically, CSMD1 regulates CYP19 expression in an SNP- and drug-dependent fashion, and this regulation is different among 3 AIs: anastrozole, exemestane, and letrozole. Overexpression of CSMD1 sensitized AI-resistant cells to anastrozole but not to the other 2 AIs. The SNP in CSMD1 that was associated with increased CSMD1 and CYP19 expression levels increased anastrozole sensitivity, but not letrozole or exemestane sensitivity. Anastrozole degrades estrogen receptor α (ERα), especially in the presence of estradiol (E2). ER+ breast cancer organoids and AI- or fulvestrant-resistant breast cancer cells were more sensitive to anastrozole plus E2 than to AI alone. Our findings suggest that the CSMD1 SNP might help to predict AI response, and anastrozole plus E2 serves as a potential new therapeutic strategy for patients with AI- or fulvestrant-resistant breast cancers.
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Project description:ImportanceErythema multiforme (EM) may become long term, with a recurrent or persistent course. First-line treatment for chronic EM is valaciclovir. There is no consensus for selection of second-line treatment of chronic EM.ObjectiveThe aim of this study was to assess the effectiveness of treatment with thalidomide for patients with chronic EM.Design, setting, and participantsIn this retrospective national multicenter cohort study, among 68 French hospital dermatology departments contacted by e-mail, 10 reported having eligible cases. All adults aged 18 years or older under dermatology care for chronic EM (including recurrent and persistent forms) who had received thalidomide between 2010 and 2018 were included. Analyses were conducted from June 24, 2019, to December 31, 2019.Main outcomes and measuresThe primary outcome was the proportion of patients who did not experience an EM flare within 6 months of initiating thalidomide treatment for recurrent EM or with complete clearance at 6 months for persistent EM (complete remission).ResultsOverall, 35 patients with chronic EM (median [range] age, 33 [15-65] years; 20 [57%] female) experienced failure of at least 1 previous treatment prior to initiating treatment with thalidomide. After 6 months of continuous thalidomide treatment, 23 (66%) were in complete remission, 5 (14%) had stopped the treatment, and 7 (20%) experienced at least 1 flare. The median (IQR) initial dose followed by remission was 50 (50-100) mg/d. Main adverse effects were asthenia (16 [46%]) and neuropathy (14 [40%]). Twenty-five (71%) of patients stopped thalidomide treatment after a median (IQR) of 12 (8-20) months owing to lack of effect (7/25 [28%]), neuropathy or another adverse effect (14/25 [56%]), or long-term complete remission (4/25 [16%]). Low-dose thalidomide, less than 50 mg every other day was sufficient in 9 of 23 (39%) of responders and was associated with less neuropathy and longer treatment duration.Conclusions and relevanceIn this cohort study, second-line therapy with thalidomide was associated with complete remission in two-thirds of the 35 patients with chronic EM. However, adverse events were a common cause of thalidomide withdrawal. In the long term, dose reduction when possible may allow for continuation by improving tolerance.
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Project description:Anastrozole is a widely prescribed aromatase inhibitor for the therapy of estrogen receptor positive (ER+) breast cancer. We performed a genome-wide association study (GWAS) for plasma anastrozole concentrations in 687 postmenopausal women with ER+ breast cancer. The top single-nucleotide polymorphism (SNP) signal mapped across SLC38A7 (rs11648166, P = 2.3E-08), which we showed to encode an anastrozole influx transporter. The second most significant signal (rs28845026, P = 5.4E-08) mapped near ALPPL2 and displayed epistasis with the SLC38A7 signal. Both of these SNPs were cis expression quantitative trait loci (eQTL)s for these genes, and patients homozygous for variant genotypes for both SNPs had the highest drug concentrations, the highest SLC38A7 expression, and the lowest ALPPL2 expression. In summary, our GWAS identified a novel gene encoding an anastrozole transporter, SLC38A7, as well as epistatic interaction between SNPs in that gene and SNPs near ALPPL2 that influenced both the expression of the transporter and anastrozole plasma concentrations.
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