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Samenvatting

Summary Preclinical Drug Research

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2019/2020

An extensive English summary of the course Preclinical Drug Research followed in academic year . Obtained result with this summary was 17/20. The explanations during the class were attentively noted and processed with the slides and course material to a complete summary. The summary consists of following chapters/lessons: Introduction to pharmaceutical industry Therapeutic modalities Chosing the project Drug discovery process (drug target identification) Drug screening technologies Pharmacokinetics in drug discovery Pharmacology (test systems screening for selectivity) Patient issues Management Drug development Assessing drug safety (General toxicity Safety Pharmacology) Genotoxicity Reproduction toxicity Carcinogenicity Local tolerance In vitro toxicology Development Routes of administration ADME and children Biopharmaceuticals

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Geüpload op
3 oktober 2020
Aantal pagina's
242
Geschreven in
2019/2020
Type
Samenvatting

Onderwerpen

Voorbeeld van de inhoud

PHARMACEUTICAL INDUSTRY
Introduction
The process of developing a molecule to a drug is very long (can take up to 15 years).
- very risky: probability to fail is high " drug development is expensive
- drugs can be subdivided in:
o chemicals: small molecules (e.g. aspirin)
o natural products: complex molecules (e.g. arthemeter for malaria)
o biologicals: vaccine, gene therapy, interferon, insulin, EPO (bio-source)

A drug can have three names: chemical, generic and tradename. (e.g. aspirin)
- chemical name: acetylsalicylic acid " used by scientists
- generic name: aspirin " universal name
o when a drug is developed, it is patented
o when the patent expires, other companies can resell the drug for a much
cheaper price = it becomes a generic drug
- trade name: for example Sedergine® (registered trademark)
o if they resell it, they give it a new tradename, although it remains the same
generic drug


Facts and figures: R&D
R&D, also known as Research and Development: some facts:
- after computer/electronics, the cost for R&D for biopharmaceuticals is highest
- the 3 largest dominating markets are EU, Japan and the USA
- cost for R&D is increasing, although the approvals by the FDA are decreasing
o FDA: US Food & Drug Administration (1 European Medicine Agency EMA)
o the cost per drug to bring it to the market is therefore increasing
o ± $1,5B: depending on research complexity, registration requirements, ...
o




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,Costs and spending

Drug development




1. Preceding the start of the development, comes the discovery (figure says 2-5 years,
while it is most of the time 10-20 years).
2. The patent must be applicated at the start of drug development (is valid for 20 years).
3. Preclinical drug research: pharmacology, -kinetics, -dynamics, toxicity, …
4. Clinical drug research:
a. Phase I: healthy volunteers, first time the drug is given to humans
i. dosing in low concentrations
ii. mostly male volunteers because of the reproductive toxicity hazard

b. Phase II: first efficacy evaluation in a small group of patients
i. this group is really well chosen
ii. first indication of the therapeutic potential of the drug

c. Phase III: global scaling evaluation of the drug all around the world
i. testing the therapeutic indication in a very diverse patient group

d. Phase IV: post-marketing vigilance
i. all the patients who received treatment
ii. doctors/paramedics need to report adverse effects of the drug


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,! The patent is valid for 20 years: so, there is a small window for the company to make the
most profit out of the drug before it becomes generic!
" in the past: when there was a new indication for the drug, the duration of the patent
could be expanded by 5 years
" nowadays it is not possible anymore: all indications must be addressed from the start
" the timing to take a patent is critical and very difficult
o too early: there is not much time after registration of the drug to earn profits
before the patent expires
o too late: because of espionage, your idea can be stolen

Generic drugs are not good for innovation: why?
- after several years: the patent expired and competition with other companies starts
- we speak of a shrinking of the market exclusivity
- at that moment, the earnings drop enormously
- and so does the budget to use in R&D for new drug discovery
- generic drugs are good for the patients: it makes the drugs a lot cheaper

Development costs and revenue cycle




- Revenue cycle: under the zero line, we invest money 1 above the line, we earn money
- Biggest expenses in clinical development
o this cost is also sharply increasing nowadays
o we face more complex diseases, for which we need to include more patients in
the clinical trials




20

, Challenges in the pharmaceutical industry: Competition and failure

- Generic competition: products which differ in
some aspects but are capable of satisfying the
same basic need of the purchaser.

- Price containment: companies can not charge
what they want

- Poor product differentiation: if you come up
with a look-a-like
o the better the differentiation, the better the sales are in the market
o for example: a better taste, a longer half-life, or more potent

- Me-too drugs: very close related products
- Parallel importation: if drugs are imported form a country where the drugs are cheaper
- Counterfeiting: unofficial drugs, mostly internet medicines

Failure rates in drug development

100 drugs enter real development, and there
are strong indications they will work
" only 8 of them are approved!

Pharmacokinetics is a major drop-out:
e.g.: too short half-life, metabolism issues, ...




Product positioning

Generics: e.g. aspirin

Mega-blockbusters e.g. Rocefoxib (Vioxx®)

Niche markets: e.g. Zolgensma (for baby Pia)
" medical differentiation is high " low competition
" sales volume of product is low: few people buy it
" unit prices are high to earn their investment back
and maximize profit




21
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