The article,
Physiological Steps Doctrine, published in 2009 in the Berkeley Technology Law Journal (
and available free on SSRN), suggested that patents claiming aspects of human physiological processes are not upheld in court. Here is the abstract of
Physiological Steps Doctrine:
In vivo conversion is a process, often metabolic in nature, wherein one
substance, usually a chemical compound, is altered significantly by
physiological pathways in the body into one or more different
substances. For example, when a patient ingests a therapeutic drug,
that drug is often converted by the natural physiology of the digestive
system into one or more chemically different metabolites. The end
products of in vivo conversion sometimes possess therapeutic efficacy.
Many patent applications have claimed such therapeutic metabolites,
either as compositions per se or as parts of methods of treatment.
Although the United States Patent and Trademark Office has granted patent claims to such products generated
by in vivo conversion of ingested drugs, and courts have noted the
eligibility of such products as patentable subject matter, never has a
United States court of final appeal upheld such a patent claim as valid,
enforceable, and infringed. The unanimity of results in cases
involving patent infringement triggered by in vivo conversion is
striking. In fact, its very improbability suggests a common underlying
explanation for why in vivo conversion does not ever seem to trigger
patent infringement. Explanations based on inherency or a lack of
evidence provide a satisfactory explanation for only a minority of in
vivo cases. The "Physiological Steps Doctrine," which suggests that
products and processes of in vivo conversion are unpatentable subject
matter under United States patent law, offers an explanation that spans all in
vivo conversion cases. Though the rationales offered to explain the
results in a number of in vivo conversion cases are suggestive, there
are several advantages for a more explicit recognition of the
Physiological Steps Doctrine. Consistent with much international,
European, and U.S. patent law, the Physiological Steps Doctrine provides
a theoretical underpinning to explain the results in cases involving
products and processes of in vivo conversion. This theoretical
underpinning not only has explanatory power for interpreting previous
case law but is also useful in predicting the outcome of future in vivo
conversion cases. In addition, the Physiological Steps Doctrine
increases the understanding of where inventions involving human beings,
and the biological products and processes thereof, fit within the
spectrum of patentable subject matter.
On March 20, 2012, the United States Supreme Court unanimously confirmed Physiological Steps Doctrine by holding invalid Prometheus Laboratories' patent claims to uses of
in vivo conversion products in diagnosis and therapy. The decision,
Mayo Collaborative Services v. Prometheus Laboratories, Inc. (U.S. 2012), may not only sound the formal death knell of
in vivo conversion patents, but also cast severe doubt on the patent eligibility of wide swaths of the personalized medicine and genomics fields.
LEXVIVO has discussed previous chapters in the Prometheus saga by the
Supreme Court and the
Court of Appeals for the Federal Circuit ("CAFC").
It would now be unsurprising if the Supremes were to vacate and remand the July 29, 2011, CAFC decision in
The Association for Molecular Pathology, et al. v. Myriad Genetics, Inc., et al. (
previously discussed on LEXVIVO) that upheld the patent eligibility of gene patents. If so, genome-derived DNA patents could be the next domino to fall in the recently turbulent game of patentable subject matter.