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Patents play an important role in the development of new pharmaceutical compounds, and therapies based upon the use of such compounds. The primary global model for drug development is based upon private enterprise and competition. Within this model, the carrot of a potential patent ‘monopoly’ provides an incentive for companies to deploy the considerable resources – with
costs commonly estimated in the billions of dollars – necessary to discover, research, trial, and market new drugs and therapies. Although
not everyone agrees that this is the best approach, it is difficult to dispute that it has, nonetheless,
contributed to the delivery of great benefits to humanity over the past century or so.
Within the realm of conventional ‘
small molecule’ drugs (i.e. setting aside, for present purposes, recent developments in biotechnology and biologics) four broad categories of patent protection can be identified.
- New compounds. When an innovator discovers or synthesises a compound that was not previously known to exist and/or to have any useful therapeutic effect, a patent may be obtained for the compound itself.
- Formulations. While it is one thing to identify a biologically-active compound, it is often another altogether to find a safe and effective way of delivering it to a patient. When an innovator develops a new and/or more effective formulation (e.g. a particular tablet or other oral dosage form), a patent may be obtained for that formulation, even if the active ingredient is well-known and no longer patentable.
- New therapeutic effects. When an innovator discovers that a compound already known to have one or more therapeutic effects has a further, and unforeseen, therapeutic use (e.g. in the treatment of a different disease or condition), a patent may be obtained for a method of using or making the compound specifically for the new therapeutic purpose.
- Improved methods of treatment. When an innovator discovers that a known compound with a known therapeutic use can be made even more effective, e.g. by combining it with other compounds or therapies, or using a different dosing regime, a patent may be obtained for the new method of treatment.
Of course, a patent will only be validly granted in any of these cases if all of the legal requirements for patentability –
novelty,
inventive step,
sufficiency of description, and so forth – are all satisfied. These requirements are intended to balance the rewards available to innovators against the rights of the broader community to access knowledge and to engage in free competition.
From a policy perspective, getting the balance right is particularly important in the case of pharmaceutical products. If it is too difficult to obtain a valid patent, there may be insufficient incentive for companies to invest billions of dollars in new drug development. On the other hand, it is important to keep in mind that, one way or another, it is the wider community – either individually, or through taxes in countries where healthcare is substantially subsidised by government – that ultimately pays for that development, through the higher prices charged for patented drugs. Allowing patents to be granted too easily therefore may therefore represent a significant social cost.
A major component of the cost of bringing a drug to market is the need to conduct extensive clinical trials in order to prove the effectiveness and safety of the drug, and thus to obtain regulatory and marketing approval. Such trials typically take years to complete, following the initial discovery of a new compound, or of a new use for an existing compound. However, a patent application must be filed as early as possible to ensure that any available protection is secured in the event that the trials are successful.
A recent appeal decision of a Full Bench of the Federal Court of Australia sheds light on how the balance between an innovator’s need to file early, and the community’s right to receive a full disclosure of the invention, is struck in the case of a patent for a new therapeutic use of a known compound:
Warner-Lambert Company LLC v Apotex Pty Limited (No 2) [2018] FCAFC 26. The court has confirmed that the fact that the clinical trials required to establish an effective and safe dosage of a drug for a new therapeutic use may be ‘complex, time-consuming and expensive’ will not render invalid a patent that was filed prior to conducting this essential research.