CYP2C19

Reflection paper on investigation of pharmacokinetics in the obese population - Scientific guideline

Retrieved on: 
Wednesday, February 14, 2024

Reflection paper on investigations of pharmacokinetics in

Key Points: 
    • Reflection paper on investigations of pharmacokinetics in
      the obese population
      Table of contents
      1.
    • References .............................................................................................. 9

      Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

      Page 2/12

      1.

    • This is considered
      a shortcoming that is potentially compounded by obese patients often being poorly represented in
      clinical studies.
    • The specific aims of this reflection paper are to:
      ?

      describe how the effects of obesity can be investigated during clinical medicinal product
      development.

    • ?

      provide recommendations on when investigations of the effect of obesity on the PK of a
      medicinal product should be particularly considered.

    • Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

      Page 3/12

      ?

      discuss how to reflect PK (and/or PK/PD) findings in weight/weight-based dosing
      recommendations.

    • Absorption
      Reduced rate of absorption linked to locally reduced blood flow (8) is reported for the subcutaneous
      and transdermal routes in obese subjects.
    • Distribution
      The distribution of medicinal products is driven by body composition, regional blood flow and binding to
      tissue and plasma proteins.
    • Obese subjects have a larger absolute lean body weight (LBW) as well as fat mass.
    • The physicochemical properties of a medicinal product (lipophilicity, polarity, molecular size, and
      degree of ionization) influence its distribution in the body.
    • In BMI class III obese
      subjects, the blood flow per gram of fat is significantly lower than that observed in class I obese or
      lean subjects (4).
    • Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

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      An increased amount of alpha-1-acid-glycoprotein (AAG), linked to a chronic inflammatory state, is
      reported in obese individuals.

    • Fatty infiltrations are present in the liver for 90% of obese subjects, with the extent of the infiltrations
      being proportional to the degree of obesity.
    • In some cases, in particular for CYP3A4 metabolized medicinal products,
      bodyweight normalized clearance can be lower in obese patients (23).
    • Based on presently available data, it has been suggested that uptake transporters

      Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

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      are downregulated while efflux transporters may be upregulated (31).

    • Platelet hyper-reactivity is also observed,
      which can impair the response to anti-platelet medicinal products in obese patients (42, 43).
    • Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

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      3.

      the medicinal product properties and scientific literature indicate that obesity may lead to a
      marked effect on elimination and/or distribution or on the PK/PD relationship.

    • These
      models may aid in extrapolating the known efficacy and safety in the non-obese population to the
      obese population.
    • The Pharmacokinetics of the CYP3A Substrate Midazolam in Morbidly Obese Patients
      Before and One Year After Bariatric Surgery.
    • Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

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      41.

    • Reflection paper on investigations of pharmacokinetics in the obese population
      EMA/CHMP/535116/2016

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23andMe Launches Total Health™, its Comprehensive, Prevention-Based Health Membership

Retrieved on: 
Tuesday, November 7, 2023

SOUTH SAN FRANCISCO, Calif., Nov. 07, 2023 (GLOBE NEWSWIRE) -- 23andMe Holding Co. (Nasdaq: ME) (23andMe), a leading genetic health and biopharmaceutical company, today launched 23andMe+ Total Health, its new, comprehensive prevention-based health membership that provides clinical grade exome sequencing, biannual blood testing, and unprecedented access to genetics-based clinical care.

Key Points: 
  • SOUTH SAN FRANCISCO, Calif., Nov. 07, 2023 (GLOBE NEWSWIRE) -- 23andMe Holding Co. (Nasdaq: ME) (23andMe), a leading genetic health and biopharmaceutical company, today launched 23andMe+ Total Health, its new, comprehensive prevention-based health membership that provides clinical grade exome sequencing, biannual blood testing, and unprecedented access to genetics-based clinical care.
  • Members of Total Health will also receive all the reports and features offered in the Company’s existing 23andMe+ Premium Membership .
  • As part of Total Health, members will gain access to all the premium reports and features delivered through 23andMe+ Premium.
  • The 23andMe+ Total Health membership will cost $99 per month, billed in a one-time annual payment of $1,188.

Can at-home DNA tests predict how you'll respond to your medications? Pharmacists explain the risks and benefits of pharmacogenetic testing

Retrieved on: 
Saturday, September 16, 2023

This variability in drug response is what pharmacogenomic testing hopes to explain by looking at the genes within your DNA.

Key Points: 
  • This variability in drug response is what pharmacogenomic testing hopes to explain by looking at the genes within your DNA.
  • Pharmacogenomics, or PGx, is the study of how genes affect your response to medications.

How do PGx tests work?

    • PGx tests look for variations within the genes of your DNA to predict drug response.
    • There are commercially available PGx tests that patients can have sent directly to their doorstep with or without the involvement of a health care professional.
    • These direct-to-consumer PGx tests collect DNA from either a saliva sample or cheek swab that is then sent to the laboratory.

Limitations of PGx testing

    • PGx testing will not be able to predict how you will respond to all medications for several reasons.
    • PGx tests can predict how you will respond only to medications associated with the genes it tests for.
    • Some drugs are broken down in very complicated pathways entailing multiple proteins and byproducts, and the usefulness of PGx testing for them remains unclear.
    • In other words, PGx testing is predictive rather than deterministic.

Risks of PGx testing

    • PGx testing carries the risk of not telling the whole story of drug response.
    • If variations within the gene are not found, the testing company often assumes the proteins those genes code for function normally.
    • Sharing your PGx test results with all the clinicians involved in your care can help prevent medication failure and improve safety.

Benefits of PGx testing

    • Direct-to-consumer PGx testing can empower patients to advocate for themselves and be an active participant in their health care by increasing access to and knowledge of their genetic information.
    • Patients’ knowledge of their PGx genetic profile has the potential to improve treatment safety.

Integrating Drug-Drug Interactions and Lifestyle Factors with Drug-Gene Interactions Provided by Castle Biosciences’ IDgenetix® Test Significantly Impacted the Number of Drug Recommendations for Patients with Moderate to Severe Depression

Retrieved on: 
Sunday, September 10, 2023

Castle Biosciences, Inc. (Nasdaq: CSTL), a company improving health through innovative tests that guide patient care, today announced data from a study showing the addition of drug-drug interactions and lifestyle factors to drug-gene interactions provided by its IDgenetix® test significantly impacted the number of drug recommendations and contributed to improved remission rates for patients with moderate to severe depression.

Key Points: 
  • Castle Biosciences, Inc. (Nasdaq: CSTL), a company improving health through innovative tests that guide patient care, today announced data from a study showing the addition of drug-drug interactions and lifestyle factors to drug-gene interactions provided by its IDgenetix® test significantly impacted the number of drug recommendations and contributed to improved remission rates for patients with moderate to severe depression.
  • The non-genetic information (drug-drug interactions and lifestyle factors) accounted for 43% of all drug recommendations in study participants, while single-gene testing for CYP2D6 and CYP2C19 contributed to only 22%.
  • At 12 weeks, patients whose medication management was guided by IDgenetix had a remission rate of 41%, compared to only 27% of patients whose medication management was not guided by the test (p=0.03, risk ratio=1.49 [1.05-2.12]).
  • The poster can be viewed here and will also be published on HMP Global’s Psychiatry & Behavioral Health Learning Network in approximately 30-60 days.

LianBio Announces Results from Phase 3 EXPLORER-CN Trial of Mavacamten Presented at the European Society of Cardiology Congress and Simultaneous Publication in JAMA Cardiology

Retrieved on: 
Monday, August 28, 2023

Mavacamten also demonstrated improvement across all secondary endpoints, including LVOT obstruction, clinical symptoms, and health status.

Key Points: 
  • Mavacamten also demonstrated improvement across all secondary endpoints, including LVOT obstruction, clinical symptoms, and health status.
  • The data presented at ESC 2023 and published in JAMA Cardiology continue to demonstrate robust evidence of mavacamten’s therapeutic benefit.
  • As previously reported, safety results in the trial were consistent with previous studies of mavacamten in symptomatic oHCM, and no new safety signals were reported.
  • “The EXPLORER-CN trial demonstrates that the well-established therapeutic benefit of this drug also extends to Chinese patients.

Common heart medication less effective in south Asian people – new research

Retrieved on: 
Wednesday, August 23, 2023

People who have recently had a heart attack are often prescribed clopidogrel, a medication that decreases the risk of having another heart attack.

Key Points: 
  • People who have recently had a heart attack are often prescribed clopidogrel, a medication that decreases the risk of having another heart attack.
  • While the drug is very effective at preventing subsequent heart attacks, it can only work if it’s activated by the body’s CYP2C19 enzyme.
  • For example, more than nine in every ten Indigenous people of the Pacific islands have one of these genetic variants.
  • Our new study has also shown that clopidogrel may not be effective for many British south Asians.

RiverFort is Pleased to Announce That It Has Arranged an Equity Prepayment Facility for Committed Prepayments up to Aggregate £5 Million (the "Facility") with Genedrive plc (LSE: GDR)

Retrieved on: 
Tuesday, April 4, 2023

The Facility and the Company's existing cash resources will be directed towards the commercialisation of the Company's Antibiotic Induced Hearing Loss test, Genedrive® MT-RNR1 ID Kit ("AIHL test") and enhancing the Genedrive® platform through the validation and verification of the Company's CYP2C19 test, Genedrive® CYP2C19 ID Kit ("CYP2C19 test") as well as providing additional working capital.

Key Points: 
  • The Facility and the Company's existing cash resources will be directed towards the commercialisation of the Company's Antibiotic Induced Hearing Loss test, Genedrive® MT-RNR1 ID Kit ("AIHL test") and enhancing the Genedrive® platform through the validation and verification of the Company's CYP2C19 test, Genedrive® CYP2C19 ID Kit ("CYP2C19 test") as well as providing additional working capital.
  • The company are currently developing a genetic test for CYP2C19 metaboliser status.
  • The Genedrive®MT-RNR1 ID Kit, selected as 1 of the 10 EVA pilot projects, is the world's first commercial point-of-care genetic test for emergency care.
  • It helps to avoid irreversible lifelong hearing loss in specific infants exposed to aminoglycosides by rapidly detecting the m.1555A>G gene variant that can cause lifelong deafness, allowing for alternative antibiotics to be prescribed.

GENOMADIX ANNOUNCES FDA CLEARANCE TO MARKET THE GENOMADIX CUBE CYP2C19 SYSTEM

Retrieved on: 
Wednesday, March 22, 2023

OTTAWA, ON, March 22, 2023 /PRNewswire/ - Genomadix, based in Ottawa, Canada, announced today the US Food and Drug Administration (FDA) granted 510(k) clearance permitting marketing of its "Genomadix CubeTM CYP2C19 System" (Cube CYP2C19 test), an automated sample-to-result PCR test.

Key Points: 
  • OTTAWA, ON, March 22, 2023 /PRNewswire/ - Genomadix, based in Ottawa, Canada, announced today the US Food and Drug Administration (FDA) granted 510(k) clearance permitting marketing of its "Genomadix CubeTM CYP2C19 System" (Cube CYP2C19 test), an automated sample-to-result PCR test.
  • The Cube CYP2C19 test can be used to aid clinicians in determining therapeutic strategy for drugs metabolized by the CYP450 2C19 genetic pathway.
  • Genomadix Cube CYP2C19 System identifies the CYP2C19 *2, *3, and *17 alleles, if present, directly from buccal swab in about an hour.
  • The Genomadix Cube CYP2C19 System is commercially distributed in Europe, as well as all countries recognizing the CE Mark (CE-IVD).

Pfizer Announces Positive Topline Results from Phase 3 TALAPRO-2 Trial

Retrieved on: 
Tuesday, October 4, 2022

At the time of topline analysis, the safety of TALZENNA plus XTANDI were generally consistent with the known safety profile of each medicine.

Key Points: 
  • At the time of topline analysis, the safety of TALZENNA plus XTANDI were generally consistent with the known safety profile of each medicine.
  • Detailed results from TALAPRO-2 will be submitted for presentation at a near-term medical congress.
  • In addition to the TALAPRO-2 trial, the combination of TALZENNA plus XTANDI is being investigated in the TALAPRO-3 trial ( NCT04821622 ), a global, randomized, double-blind, placebo-controlled Phase 3 study in men with HRR-deficient mCSPC.
  • Pfizer assumes no obligation to update forward-looking statements contained in this release as the result of new information or future events or developments.

Genomadix Inc. Announces Know-How License Agreement with Mayo Clinic

Retrieved on: 
Monday, August 29, 2022

OTTAWA, ON, Aug. 29, 2022 /PRNewswire/ - Genomadix today announced it has entered into a know-how license agreement and stock purchase agreement with Mayo Clinic to advance its point of care molecular analyzer technology.

Key Points: 
  • OTTAWA, ON, Aug. 29, 2022 /PRNewswire/ - Genomadix today announced it has entered into a know-how license agreement and stock purchase agreement with Mayo Clinic to advance its point of care molecular analyzer technology.
  • "We are extremely proud to be collaborating with Mayo Clinic to progress our technology and mission to make highly accurate molecular testing available for the benefit of patients.
  • This collaboration seeks to seed new product developments with focused expertise provided by Mayo Clinic experts" commented Steve Edgett, Genomadix's CEO
    Mayo Clinic has a financial interest in the technology referenced in this press release.
  • Mayo Clinic will use any revenue it receives to support its not-for-profit mission in patient care, education, and research.