Abstract:
BACKGROUND:Brain-derived neurotrophic factor (BDNF), a neurotrophin that regulates neuronal function and development, is implicated in several neurodegenerative conditions. Preliminary data suggest that a reduction of BDNF concentrations may lead to postchemotherapy cognitive impairment. We hypothesized that a single nucleotide polymorphism (rs6265) of the BDNF gene may predispose patients to cognitive impairment. This study aimed to evaluate the effect of BDNF gene polymorphism on chemotherapy-associated cognitive impairment. METHODS:Overall, 145 patients receiving chemotherapy for early-stage breast cancer (mean age: 50.8 ± 8.8 y; 82.1% Chinese) were recruited. Patients' cognitive functions were assessed longitudinally using the validated Functional Assessment of Cancer Therapy-Cognitive Function (v.3) and an objective computerized tool, Headminder. Genotyping was performed using Sanger sequencing. Logistic regression was used to evaluate the association between BDNF Val66Met polymorphism and cognition after adjusting for ethnicity and clinically important covariates. RESULTS:Of the 145 patients, 54 (37%) reported cognitive impairment postchemotherapy. The Met/Met genotype was associated with statistically significant lower odds of developing cognitive impairment (odds ratio [OR] = 0.26; 95% CI: 0.08-0.92; P = .036). The Met carriers were less likely to experience impairment in the domains of verbal fluency (OR = 0.34; 95% CI: 0.12-0.90; P = .031) and multitasking ability (OR = 0.37; 95% CI: 0.15-0.91; P = .030) compared with the Val/Val homozygote. No associations were observed between Headminder and the BDNF Val66Met polymorphism. CONCLUSIONS:This is the first study to provide evidence that carriers of the BDNF Met allele are protected against chemotherapy-associated cognitive impairment. Further studies are required to validate the findings.
journal_name
Neuro Oncoljournal_title
Neuro-oncologyauthors
Ng T,Teo SM,Yeo HL,Shwe M,Gan YX,Cheung YT,Foo KM,Cham MT,Lee JA,Tan YP,Fan G,Yong WS,Preetha M,Loh WJ,Koo SL,Jain A,Lee GE,Wong M,Dent R,Yap YS,Ng R,Khor CC,Ho HK,Chan Adoi
10.1093/neuonc/nov162subject
Has Abstractpub_date
2016-02-01 00:00:00pages
244-51issue
2eissn
1522-8517issn
1523-5866pii
nov162journal_volume
18pub_type
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