Publications by authors named "R H N Van Schaik"
Tamoxifen is an estrogen-receptor (ER) antagonist, used as adjuvant treatment of ER-positive breast cancer. It is converted by CYP2D6 into endoxifen, its most active metabolite. Patients with endoxifen plasma concentrations <16 nM face a higher risk of recurrence.
View Article and Find Full Text PDFBackground: Long-acting beta2-agonists (LABA) in combination with inhaled corticosteroids (ICS) are commonly used to treat asthma, however, some children lack response to the addition of LABA. This might be partially due to the presence of the Arg16Gly polymorphism, encoded by rs1042713 G>A in the ADRB2 gene. Carrying the A allele (Arg16) at this variant has been associated with an increased risk of exacerbations despite LABA treatment.
View Article and Find Full Text PDFAligned with the mission of the Dutch Pharmacogenetics Working Group (DPWG) to promote the implementation of pharmacogenetics (PGx), this guideline is specifically designed to optimize pharmacotherapy of cholesterol lowering medication (statins) and glucose lowering medication (sulfonylureas). The SLCO1B1 c.521 T > C variant reduces the activity of the SLCO1B1 transporter involved in statin transport out of the blood into the liver.
View Article and Find Full Text PDFArticle Synopsis
- Alectinib is a treatment for ALK+ non-small cell lung cancer, but many patients experience drug-related toxicity requiring dose adjustments, potentially linked to genetic variants.
- In a study of 215 patients, 47% had severe toxicity, with females being more affected and having higher drug levels. Additionally, specific genetic variants like PPAR-α 209G>A were associated with increased toxicity.
- Identifying these genetic factors could help tailor treatments and reduce adverse effects, suggesting the need for pre-treatment genetic testing and possible dose modifications.
Aims: A genotype-guided P2Y12-inhibitor de-escalation strategy, switching acute coronary syndrome (ACS) patients without a CYP2C19 loss-of-function allele from ticagrelor or prasugrel to clopidogrel, has shown to reduce bleeding risk without affecting effectivity of therapy by increasing ischemic risk. We estimated the cost-effectiveness of this personalized approach compared to standard dual antiplatelet therapy (DAPT; aspirin plus ticagrelor/prasugrel) in the Netherlands.
Methods And Results: We developed a one-year decision tree based on results of the FORCE-ACS registry, comparing a cohort of ACS patients who underwent genotyping with a cohort of ACS patients treated with standard DAPT.