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US to rule on research patent

Nature volume 440, page 587 (30 March 2006) | Download Citation

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Supreme Court considers the law on natural phenomena.

Washington DC

It is a case that questions the very nature of what can be patented. Before the US Supreme Court adjourns at the end of June, it may decide whether a patent based on a biological relationship between two substances can be issued. A verdict could have implications for many other US and worldwide patents.

“The United States is often an incubator for these issues,” says Francis Gurry, deputy director-general of the World Intellectual Property Organization in Geneva, Switzerland. “The world is watching with a great deal of interest.”

A natural phenomenon or a law of nature generally cannot be patented, but a process that takes advantage of that phenomenon or law can be. Lawyers have been battling over this rule in biotechnology cases since at least 1980, when the Supreme Court ruled that a newly discovered microbe capable of digesting petrol could be patented. That case opened the door for the biotechnology industry and ushered in patents for antibodies, microorganisms and cells.

Some feel that it is now too easy to patent natural phenomena. “There might be some individuals who would like to close that door,” says Nick Godici, a former US Patent and Trademark Office commissioner.

Thought police: the Supreme Court is reviewing a case that could “wreak havoc on the patent world”.

The latest case — Laboratory Corporation of America Holdings (LabCorp) against Metabolite Laboratories — deals with the field of biomedical diagnostics. It stems from a patent-infringement case over a method for diagnosing vitamin B deficiencies. In 1990, Metabolite patented a diagnostic test, based on an assay that measures blood levels of homocysteine, an amino acid. High levels of homocysteine are correlated with low levels of vitamin B12. Physicians often order such tests because high homocysteine levels are also correlated with increased health risks such as heart attacks, stroke and birth defects.

Metabolite licensed the test to LabCorp, a clinical testing company. LabCorp stopped using it in 1998 and replaced it with a similar test developed by another company. When LabCorp stopped paying royalties, Metabolite sued for patent infringement. LabCorp lost, was ordered to pay $7.8 million, and lost again on appeal.

In the case heard by the Supreme Court on 21 March, LabCorp argued that Metabolite had patented a law of nature by asserting ownership of the relationship between homocysteine levels and vitamin B12. Under these circumstances, LabCorp said, physicians infringe the patent simply by thinking about the relationship when studying test results.

Miguel Estrada, an attorney for Metabolite, told the court that the natural relationship is integral to the diagnostic step. Addressing the broader issue, he argued, could “wreak havoc on the patent world”.

A corresponding European patent does not claim to cover the relationship between levels of homocysteine and vitamin B12, and is not currently being challenged, says Siobhan Yeats, a biotechnology director at the European Patent Office in Munich, Germany.

The Supreme Court could now come to a verdict, pass the case back to the lower courts, or dismiss it altogether. One complication is that the biological-relationship argument was not addressed in the lower courts.

And although no one can predict which way the vote will go, at least one justice indicated his thoughts during the hearing. Justice Stephen Breyer hinted that patenting a scientific phenomenon might limit researchers' motivations to search for new cures. “If you don't provide them with an incentive,” he said, “they may think of less.”

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