A New Paradigm of Drug Development



A New Paradigm of Drug Development






However beautiful the strategy, you should occasionally look at the results.

–Winston Churchill, British Prime Minister.

This chapter presents a 25,000 foot view of the current pressures on the industry and the current ways in which drugs are developed, then suggests a way of developing drugs that is different from the most widely used approach in large pharmaceutical companies. The new approach is based on the assumption that the current blockbuster approach that large pharmaceutical companies strive for cannot be sustained for several reasons; and, that a new way of exploiting potential drug opportunities needs to be adopted. While the pressures on pharmaceutical companies described in this chapter are seen by most of them as major threats or problems, it is also possible to view some of these as an opportunity.


WHY IS A NEW PARADIGM OF DRUG DEVELOPMENT NEEDED?

The reason that a new paradigm of drug development is needed is due to the huge pressures on the industry. Some of the most important ones are industry’s ability to develop drugs is constantly under threat by the Food and Drug Administration’s (FDA) increasing standards, both technical and non-technical. These standards occasionally increase to the degree that they become unrealistic in several respects:



  • In terms of developing and applying technical methods at the border of what is possible to measure (e.g., assessing nanogram quantities of an active drug substance in biological fluids)


  • In terms of the time required versus benefit gained in studying technical questions (e.g., conducting toxicology studies on minute amounts of impurities in the drug)


  • In terms of increasing patient numbers in a New Drug Application (NDA) to establish an “acceptable level of safety” to the FDA, particularly when questions of “possible” adverse events arise (e.g., since liver enzyme elevations in Phase 3 studies on a new drug may mean that more severe hepatotoxicity may occur after the drug is approved, and liver transplants could be required, companies have sometimes been asked to study 10,000 additional patients prior to marketing approval)


  • In terms that the FDA often seems to raise standards when questions or accusations are made by self-appointed citizen groups who seem to believe that drugs must be risk-free, rather than responding to assessments by reasonable scientists, physicians, and other professionals

Furthermore, the FDA‘s political reactions sometimes trump their internal scientific standards (e.g., Plan B’s delays in being switched to over-the-counter status). This results in the unwillingness by most division directors (or office directors) to overrule reviewers (or division directors) whose judgment is overly conservative or outside the thinking of the medical mainstream on a particular issue.

Intellectual property protection is vital for new inventions, and yet is under attack from those (particularly in underdeveloped
countries) who view patents as a developed country’s method to prevent their country from exercising free choice about which products it wishes to pirate. Protecting intellectual property requires continued vigilance by industry and governments and a strong proactive program to ensure its health, which is critical to ensure that pharmaceutical companies can protect the rights to their inventions and can remain in business. Without patents, there would be almost no new drugs invented.

The assumption that the current blockbuster mentality (paradigm) of drug development within large and most medium pharmaceutical companies can continue indefinitely is just that, an assumption. An objective assessment of the limitations of this assumption would recognize that if another development paradigm is available then it should be seriously considered.

Another element is whether a global-based free market economy without the price controls currently in place in many countries will ever come about. The international trend in price controls is on the contrary, toward greater and greater controls on prices. Given that the prices of many new drugs exceed the averages of those previously developed by orders of magnitude, it appears necessary for industry to seek other ways to protect its future ability to develop and market drugs that may not be reimbursed to the price levels they wish to set. The greatest threat to the industry in this regard is the issue of whether price controls will be initiated in the United States, and if so, in what ways. While the industry has a great deal of power and influence at the national legislative level in the United States the public discontent about drug prices has been gradually escalating. While one aspect of this concerns re-importation of drugs from Canada, it is not a big step for the public and legislators to seek direct controls on prices of new drugs in the United States. However, price controls in the United States would have a chilling effect on the amount of money companies would likely spend on research essentially killing the goose that laid the golden egg.

It is becoming more and more challenging to maintain a positive biomedical research environment both within a company and within the overall industry because of how the industry is perceived. The industry has joined the tobacco and oil industries as the most disliked by the public. There are ever-increasing attacks directed against pharmaceutical research in the press, legislatures, and public forums. This attitude even takes violent forms, targeting our companies through animal rights groups and groups against cloning, use of stem cells, genetically modified excipients or foods, tissue usage, or use of fetal cells, and many other similar groups.

Lastly, there are the ethical issues and values that must be respected as the society seeks to deal with the many perspectives on all the above issues. The public is demanding to be involved in the decision-making process of the FDA and, in response, the agency has been going out of its way to accommodate and solicit public input on these and many other issues. All of the above factors suggest that the industry needs to be aware of, and ready to adopt, any new paradigms of drug development which may be in the industry’s interest to adopt.


CURRENT PARADIGM OF DRUG DEVELOPMENT

Companies have been forced by the economics of drug discovery, development, and marketing to focus their efforts on bringing to market only those drugs that have large economic returns. These pressures are growing stronger on companies, and one can easily observe rapidly escalating hurdle rates (i.e., minimal expected sales of a drug required to put a compound into development, or sometimes to keep it in development) over the past several decades. For the largest companies, the minimum sales numbers to be achieved in the third year after marketing a new drug often range from $250 to $500 million per year to make its development feasible. For midsized companies, the minimum estimated third-year sales are approximately $75 million, and for smaller companies, the minimum sales numbers for a new product are less, often in the range of $5 to $15 million in the third year.

In their discovery and development activities, most companies are competing in the same therapeutic area, and often in the same disease. Discovery efforts aimed at finding new drugs involve only about 500 targets, which is a small number when it must serve the entire pharmaceutical industry and its continuous need to produce novel and medically valuable treatments. More than 200 of these targets are enzymes. Other targets include ion channels, cell nucleus receptors, hormones, cell growth factors, DNA, and cell membrane receptors. Everyone can appreciate how important it is when a scientist in academia or elsewhere describes a new receptor or protein with biological applications that serves as a new target. The research-based industry would wither away and possibly perish if the flow of new targets stopped.


A Significant Issue about Future Drug Discoveries: Personalized Drugs

Judging at least by the amount of genomic hype generated over the past decade we seem to be poised on the verge of an explosion of knowledge in the fields of genomics and proteomics, in that thousands of new targets are expected to be identified in future years. These efforts will undoubtedly yield drugs and biological products aimed at treating smaller populations of patients who (it is expected) will be identified by both conventional and genetic testing to diagnose their specific abnormality or subtype of a broad disease (such as hypertension). In addition, genetic testing may help screen patients to identify those who are at risk for serious adverse events. The enthusiasts claim that genetic typing and diagnosis of patients will lead to smaller and smaller disease categories, will identify many new diseases that are unknown today, and also will identify those at risk of developing a specific disease. Development of new drugs for smaller populations of patients, while not generally yielding blockbuster revenues, could nevertheless treat many patients more effectively than they are treated today.

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Oct 2, 2016 | Posted by in GENERAL SURGERY | Comments Off on A New Paradigm of Drug Development

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