Personalized Medicine Flashcards
Treatment Decisions are based on
Practice guidelines
Primary literature
Clinician experiences
Arbitrary guessing
Inter-individual variability in
Development of diseases
Drug efficacy
Drug toxicity
Personalized medicine has four groups
Responders
Non responders
Toxic responders
Non-toxic responders
Average drug efficacy =
50% response rate, some are better than other and some are worse
ADRs are most common with what drugs?
Diuretics
Opiods
Anticoagulants
Application of PGx
Identify basis of inter-individual variability
Enable tailoring of therapy
Identity novel treatment approaches
Single Gene Testing Required
UGT1A1
HER2
HLA-B*5701
Microarray genotyping does how many genes?
500,000 genes on one chip
What factors can affect PK and PD
Unidentified genetic factors
Environmental factors
Interactions
Clopidogrel + CYP 2C19
It is a prodrug that is activated via CYP in the liver and then can go to decrease platelet activation and thrombus formation
Intermediate metabolizers with clopidogrel have
52% increase risk of death from CV event
Poor metabolizers with clopidogrel have
> 3.5 fold increase in risk of second CV event (lack effects of the drug)
Need an alternative agent
Abacavir can cause
a hypersensitivity reaction with first 6 weeks and can be fatal if rechallenged
Abacavir had what kind of approval?
Accelerate with contingencies (they had to be able to who would and wouldn’t have the hypersensitivity rxn)
With and without genotyping how many people have the rxn
8% vs 3.5% with
**Traditional Chemotherapy
Doxorubicin
Cyclophosphamide
Paclitaxel
Docetaxel
**Targeted Chemotherapy
Trastuzumab
**Hormonal Chemotherapy
Tamoxifen
Aromatase inhibitors
80% are adequately treated with
surgery +/- radiation and hormonal therapy
Chemotherapy can be beneficial how?
25% relative risk reduction for recurrence
High toxicity
Oncotype Dx
21 gene assay
Some housekeeping genes and the cancer genes
Low risk + Chemo
No benefit
Intermediate risk + Chemo
No benefit statistically
High score + Chemo
Significant improvement with chemo