Tag: evergreening

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Biotech Healthcare Patents Pharma

Professors Erika Lietzan and Kristina Acri Argue That Current Data Do Not Support Evergreening Allegations

By Jack Ring

Overlaid images of pills, a gloved hand of someone expecting a pill, and an eyedropperIn their forthcoming paper, Solutions Still Searching for a Problem: A Call for Relevant Data to Support “Evergreening” Allegations,[1] C-IP2 Senior Scholars Erika Lietzan of Mizzou Law and Kristina Acri of Colorado College call for relevant data to support evergreening allegations and accompanying policy proposals. “Evergreening” is often described as brand drug companies securing additional patents and FDA exclusivities, which grant greater market exclusivity than the initial exclusivities.[2] Evergreening has long been the subject of criticism and policy reform.

The article evaluates empirical data commonly offered to substantiate evergreening and explains that the data, while largely accurate, does not support proposed policy changes. The authors argue that the most relevant data points for policymakers are (1) when brands face competition and (2) what drives the timing of that competition. The authors indicate that no empirical studies answer these questions, so this article concludes by proposing a study designed to properly consider these factors.

I.              Background

Evergreening allegations stem from protections on brand drugs that advocates view as too many patents or FDA exclusivities, which, they claim, improperly extend the drug’s exclusivity.[3] FDA exclusivities include exclusive periods of approval or markets as well as processes for bringing generic drugs to market. Under the Federal Food, Drug, and Cosmetic Act (FDCA), the FDA approves all new drugs before they are sold.[4] However, the FDCA does not define “drug” or “new drug,” which may refer to an active ingredient, a finished product, or both.[5] While the FDCA does not specify, the FDA in practice approves products (finished medicines as they are sold in the market), not active ingredients (active molecules and components of finished products).[6]

The FDCA controls the processes of bringing a generic drug to market.[7] As critics point out, some statutory processes bar generic drugs from entering the market until the patents expire. However, this is not always the true.[8] Moreover, the FDCA provides different forms and lengths of exclusive approval as a reward for drug makers performing the preclinical and clinical research needed to bring a drug to market. These range from six months for performing pediatric studies[9] to seven years for “orphan” drugs intended to treat a rare disease or condition.[10]

Much of the evergreening allegations and outcry focus on exclusivities stemming from continuing innovation. Continuing innovation is common because developing new molecular entities is time- and cash-consuming. Therefore, brand companies benefit from identifying new uses for new molecular entities. Moreover, those new medical uses (indications) may be eligible for new patents and statutory exclusivities. Protections for continuing innovation, however, are narrow and only prevent the approval of generic drugs for that new, specific use.[11]

II.            The Hastings Project and Current Data for Policymakers

The University of California Hastings College of Law hosts a database that (1) identifies the earliest and latest expiring patent or exclusivity for new drugs and (2) calculates the number of months between those dates.[12] The authors undertook a large audit of the Hastings Database. Like the Hastings Database, major empirical studies offered to support the allegation of “evergreening” focused on counting patents and exclusivities.[13] The Hastings Database utilizes three counting metrics: earliest protection end date, latest protection end date, and delta between the two called “months added.” The authors’ audit raised questions regarding the inferences drawn about competition from patent and exclusivity counts generally.

The authors argue that the Hastings Database is insufficient to inform policy debate because it does not provide the most relevant piece of information for policymakers: when new drugs face competition and why. The Hastings Database estimates new drug entry and competition based on the latest protection date for a drug’s applicable exclusivities. However, the exclusivities used to calculate that date do not prohibit all new drug entry. Therefore, because new drugs could enter the market before the latest protection date, that data point does not serve as a relevant data point for policymakers seeking to drive timely generic competition. In the authors’ own data review, every new chemical examined had a generic drug available before the latest expiry date listed in the Hastings Database. The authors’ audit confirmed their skepticism of the “latest protection end date” as a proxy for the likely generic entry date. Actual generic competition date will likely launch at least five years earlier, with nearly 18% launching more than ten years sooner.[14]

III.          Takeaways and the Call for Relevant Data

While the authors audited the Hastings Database and analyzed their own dataset, they recognized their research still did not provide the answers to the most important questions: (1) when do generic drugs reach the market and (2) what drives that timing? A study designed to consider the market entry date of the first generic drug based on any brand product containing a particular new active ingredient would determine the factors driving that market entry date.

The publication closes by describing this better study and calling for this data. At a high level, the study would focus on each new molecular entity approved since 1983 with the relevant dates being the “Initial Protection End Date” and the “NCE Competition Date.” Initial Protection End Date would start with the first approved brand product containing the NCE. NCE Competition Date would be the commercial launch date for the first product, approved on the basis of an abbreviated application (relying on the brand company’s research), to contain that same NCE for the same indication(s). They recommend a database covering all new molecular entities since 1984 to allow policymakers to study these trends. The database would allow policymakers to see exactly how long brand companies with new chemical entities enjoy a market without competition from another company marketing the same chemical entity for the same use on the basis of the brand company’s own research. Where the Generic Competition Date (actual commercial launch date) is later than the Initial Protection End Date, one would need to investigate the reason for its timing. Perhaps the generic company had difficulty making a bioequivalent, the market is too small, or the generic company faced manufacturing issues.

IV.          Policy Implications

As the authors make clear, policymaking based on latest expiration date (the Hastings Database approach) before consideration of actual market entry (the authors’ proposed study) would be premature. The number of patents and exclusivities, and the difference between the earliest and latest expiration date of patents and exclusivities, do not illustrate evergreening. Yet, current policy proposals rely on this counting method used by the Hastings Database to support reforms. This is reliance on data to with no correlation to the purported issue. This article, rather, provides a sketch of how a proper database could be built and a study could be conducted to measure evergreening. Evergreening claims can only be substantiated with proper empirical data. Unless empirical data shows that evergreening is a problem, policy solutions are unnecessary.

[1] Erika Lietzan and Kristina Acri née Lybecker, Solutions Still Searching for a Problem: a Call for Relevant Data to Support “Evergreening” Allegations, 33 Fordham Intell. Prop., Medifa & Ent. L.J. (forthcoming 2023), https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4230310#.

[2] For an overview of arguments that drug companies obtain too many patents and too much exclusivity, which raises prices, see Erika Lietzan, The “Evergreening” Metaphor in Intellectual Property Scholarship, 53 Akron L. Rev. 805, 848-851 (2020); see also Erika Lietzan, The Evergreening Myth, Regulation 24, 25 (Fall 2020).

[3] E.g., Robin Feldman & Evan Frondorf, Drug Wars: A New Generation of Generic Pharmaceutical Delay, 53 Harv. J. on Legis. 499, 510 (2016); Michael A. Carrier, A Real-World Analysis of Pharmaceutical Settlements: The Missing Dimension of Product Hopping, 62 Fla. L. Rev. 1009, 1016 (2010).

[4] 21 U.S.C. § 355(a).

[5] The term “drug” is ambiguous at FDA. The FDA approves brand products, not active ingredients, and those products are copied by generic companies. As a result, a brand’s active ingredient may be spread over multiple products. 21 U.S.C. § 321(g).

[6] FDA defines “active ingredient” as “any component that is intended to furnish pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body of man or other animals.” 21 C.F.R. § 314.3(b). The active ingredient includes the ester, salt, or other noncovalent derivative of the molecule responsible for the physiological or pharmacological action of the drug substance. 21 C.F.R. § 314.3(b). That molecule, in turn, is the “active moiety.”

[7] See 21 U.S.C. §§ 355(j)(2)(A)(vii)–(viii), 355(j)(2)(B)(i).

[8] These circumstances include when (1) the patent claims a method of use for which the generic company does not seek approval, or (2) the brand company does not sue for patent infringement after a paragraph IV certification. 21 U.S.C. §§ 355(j)(2)(A)(vii)(IV); id. § 355(j)(2)(B)(i).

[9] 21 U.S.C. § 355a. Pediatric exclusivity is awarded after the research is complete, when the brand company submits a report to the agency that “fairly” responds to the written request. Id. § 355a(d)(4).

[10] Id. § 360bb(a)(2).

[11] Moreover, generic companies seeking to enter the market can choose not to seek approval for the new indication. 21 C.F.R. § 314.127(a)(7). For example, if a brand drug treats conditions A, B, and C and condition C is still subject to a patent or statutory exclusivity, a generic drug company could still receive approval to sell their drug to treat condition A and B.

[12] See Evergreen Drug Patent Search, https://sites.uchastings.edu/evergreensearch.

[13] This includes pieces by Robin Feldman, a Hastings professor. Robin Feldman, May Your Drug Price be Evergreen, 5 J.L. & Biosci. 590, 590 (2018); Amy Kapczynski et al., Polymorphs and Prodrugs and Salts (Oh My!): An Empirical Analysis of “Secondary” Pharmaceutical Patents, 7 PLOS Online 12 (2012).

[14] Lietzan & Acri, supra note 1, at 44–46.

Categories
Biotech Patents Pharma

Reply and Response to C-IP2’s March 4, 2021, Blogpost on UC Hastings’ Evergreen Drug Patent Search Database

C-IP2’s original post on the UC Hastings’ Evergreen Drug Patent Search Database can be read here.

Reply to Blog Post on UC Hastings’ Evergreen Drug Patent Search Database

Robin Feldman
Arthur J. Goldberg Distinguished Professor of Law
Albert Abramson ’54 Distinguished Professor of Law Chair
Director of the Center for Innovation at University of California Hastings

We would like to thank the author of the blog post for taking the time to look at our work for the Evergreen Drug Patent Database. It is always appreciated when others explore and examine our data. In addition, the benefit of a website is that helpful feedback from visitors can be used to make the information more accessible and easier to navigate.

We would also like to point out that the blog post misunderstands the nature of the project. The project begins with the initial patent protection on the chemical formulation of a drug and then tracks additional protections. Some of these protections increase the amount of time that the drug is protected. Others increase the number of protections that a challenger would have to overcome, without extending the length of time.

One can think of the difference in terms of building a wall of protection. Some protections make the wall higher by extending the total time period. Other protections make the wall thicker, so it is tougher for a competitor to break through.

We do have a separate tab that allows one to calculate only the months of added protection, for those who wish to view the data in that manner. We also offer tabs to view the number of unique patents and the number of patent extensions. Our goal is to allow the user to examine the information through different lenses, so that one can understand the many ways a patent holder can extend or toughen protection. If we like certain aspects, we should keep them; if we don’t like certain aspects, we should amend them. Either way, it is important to understand the system in which we live.

In addition, the blog post also may have misunderstood the database’s starting point. Specifically, the post asks why the database “allot[s] ranolazine less than four months of ‘earliest’ protection time” and suggests that such a short period of protection “seems suspect.” The answer is simple. The Evergreen Drug Patent Database begins in 2005. Thus, drugs whose original patents were around a long time have little protection left when the database begins. (The blog post itself notes this history of the drug.)

Finally, the blog post questions the database’s treatment of different strengths of the drug, questioning the fact that when patents and exclusivities apply to multiple strengths of a drug, they are counted once for each instance. We chose this approach because the law prevents automatic substitution at the pharmacy counter among different strengths. In fact, shifting the market to a new strength can create a powerful method of product-hopping by blocking generic substitution. Try asking your pharmacist the cost to fill your prescription with two 25 mg tablets rather than one 50 mg tablet. The cost variations can be odd and economically irrational. In short, creating multiple strengths of a drug can provide a form of protection in and of itself. Our goal is to report as many of these aspects as possible.

In the same vein, if the brand company has shifted the market to a different strength or formulation of the original drug, delisting the original drug can be used as an evergreening technique. It can prevent generic hopefuls from obtaining samples of a brand drug, when having samples is essential for FDA approval. It also can lead health plans to reimburse the generic at the disfavored rate of brand drugs, because the generic is now the only drug on the market at that precise dosage and formulation. One could argue that a delisting request should be characterized as something other than a protection; the argument would not be unreasonable. Nevertheless, the database chronicles the Orange Book history of each drug, based on all changes recorded. We consider any delisting information to be part of a complete picture of that history.

In closing, we note that it is highly unusual for legal academics to publicly release their data, let alone at this level of excruciating detail. We do so in the spirit of academic exchange and full disclosure, and we hope that those who write for this blog, as well as those who read it, will be motivated to follow suit.

Response to Professor Feldman’s “Reply to Blog Post on UC Hastings’ Evergreen Drug Patent Search Database”

C-IP2 appreciates Professor Feldman taking time to respond to our March 4, 2021, blogpost describing some of the problems we have identified with the UC Hastings’ Evergreen Drug Patent Search Database. We have posted her response in full, in the spirit of academic inquiry and collegiality that C-IP2 strives to foster. At the same time, we want to emphasize that we do not believe that her response in fact undercuts the observations in our original post. While we agree with Professor Feldman that legal academics should release for public scrutiny the data upon which they have based their conclusions—particularly when those conclusions are intended to have some bearing on important public policy considerations—we stand by our original statement “that—because of limitations in the methodology used and given the inadequate transparency with respect to the underlying data—policymakers and others who consult the Database [could] be misled by the statistics.”

C-IP2 disagrees with Professor Feldman’s suggestion that our post “misunderstands” Hasting’s database and its starting point. The post’s description of the database as a resource that UC Hastings had created “to address the perceived problem of ‘evergreening’” reflects UC Hasting’s own description of the database. See, for example, statements on the database’s “About” page.[1] Indeed, the database is explicitly referred to on that page as “Evergreen Drug Patent Search.” One might easily be confused into thinking that the database provides information reflecting the actual period of exclusivity experienced by FDA-approved drugs, which it clearly does not.

With all due respect, Professor Feldman seems to misunderstand some aspects of the original post. For example, at one point she states that the reason the database “allot[s] ranolazine less than four months of ‘earliest’ protection time” is because the database “begins in 2005.” But the starting point of the database is irrelevant. The database reports the drug’s “Approval Date” as January 27, 2006, and the “Earliest Prot[ection] Date” as May 18, 2006, which is a little less than four months. The database goes on to report that May 27, 2019, is the drug’s “Latest Prot[ection] Date,” leading the database to conclude that the drug had received 156 “Months Add[itional] Prot[ection] Time.” C-IP2 continues to find “suspect” the database’s implied assertion that a drug that has been on the market less than four months is already benefitting from “additional protection time,” particularly when the context of the database might lead one to believe that “additional protection time” equates with “evergreening.”

 

[1] https://sites.uchastings.edu/evergreensearch/about/#.YS_g6o5KhM1

Categories
Patents Pharma

UC Hastings’ Evergreen Drug Patent Search Database: A Look Behind the Statistics Reveals Problems with this Approach to Identifying and Quantifying So-Called “Evergreening”

Professor Robin Feldman’s reply to this post, and our response, can be read read here.

pharmaceuticalsThe Center for Innovation, housed at the University of California Hastings College of the Law, has created an Evergreen Drug Patent Search Database (the “Evergreening Database,” or “Database”).[1] The Database was created to address the perceived problem of “evergreening,” which the Database defines as “pharmaceutical company actions that artificially extend the protection horizon, or cliff, of their patents.”[2] Its data include patent and non-patent exclusivity information from out-of-date versions of the FDA’s Orange Book.[3] The implication seems to be that these statistics, which include things like the number of “protections” and “extensions” associated with a drug, and the amount of “additional protection time” resulting from these protections and extensions, serve as indicia of evergreening, which the Center for Innovation characterizes as a “problem [that] is growing across time.” The Database’s homepage explains that “[t]he Center for Innovation hopes that policymakers and other stakeholders use this information to identify potential problems with evergreening and develop new solutions so that anyone and everyone can access the life-saving medication that they need.”

Based on our preliminary exploration of the Evergreening Database, we are concerned that—because of limitations in the methodology used and given the inadequate transparency with respect to the underlying data—policymakers and others who consult the Database will be misled by the statistics. While the Database allows the public to access the underlying data, the format in which the data are provided makes the process of accessing and understanding them relatively burdensome.

The problems we have identified with the statistics provided by the Evergreening Database are numerous and multifaceted, and it would be beyond the scope of a single blog post to try to address them all. Instead, we have decided to focus on a single drug, ranolazine, which is used to treat angina and marketed by Gilead under the tradename Ranexa. There is nothing particularly unique about ranolazine—the problems with its statistics are representative of what we have generally observed to be pervasive throughout the Database. The ranolazine entry caught our attention because it purports to show that the drug was a subject of a relatively large number of “protections” (24 of them) and 13 years of “additional protection time,” even though the total time between the approval of the drug and expiration of all associated patents and exclusivities was only a little more than 13 years—about five years less than the average term of a U.S. patent.

We will start with an initial explanation of the methodology underlying the Evergreening Database. As mentioned above, the statistics are derived from out-of-date versions of the FDA’s Orange Book, which is published on the FDA’s website and provides information on patents and “exclusivities” associated with FDA-approved drugs. The exclusivities can be any of a variety of non-patent regulatory exclusivities that Congress created to reward innovators that have achieved certain outcomes that Congress sought to incentivize. Examples include the “NCE exclusivity”—five years of data exclusivity awarded for the initial approval of a new active ingredient, i.e., a “new chemical entity”—and the seven years of orphan drug exclusivity awarded to an innovator that develops a drug for a rare disease or condition. The Orange Book provides a listing of these exclusivities, as well as a list of patents relating to the approved drug (i.e., patents claiming the drug’s active ingredient, formulations of the drug, and methods of using the drug). It also provides expiration dates for the patent and exclusivities. The FDA periodically revises the Orange Book, and when it does, it removes from the lists any patents and exclusivities that have expired.

The creators of the Evergreening Database compiled this historical data in a Comma Separated Values file (“the CSV file”). The Database uses the patents and exclusivities derived from the CSV file to generate various statistics for each drug, including a total number of “protections” and “extensions,” as well as the “earliest protection date,” “latest protection date,” and the number of “months of additional protection” (which is the time between the earliest protection date and the latest protection date). Presumably, these statistics are intended to shed some light on the purported evergreening practices of pharmaceutical companies.

Now let us turn to ranolazine. The Evergreening Database entry for ranolazine provides the New Drug Application (“NDA”) number for the drug (21526), the branded product name (Ranexa), the name of the innovator company associated with the branded drug (Gilead), and the date of FDA approval (January 27, 2006). The ranolazine entry also provides various statistics derived from the raw data, including the number of “protections” (26) and the amount of “additional protection time” (156 months, i.e., 13 years). This seems to provide an example of evergreening. The statistics appear to show that Gilead gamed the system to “artificially extend the protection horizon of its patents” by 13 years. However, a closer examination of the raw data tells a quite different story.

First, what are the 26 purported “protections” that Gilead has apparently secured with respect to Ranexa? Eleven of them are patents that were once listed in the Orange Book for the drug. All the listed patents have expired, so none appear in the current Orange Book. While the Database lists the patents, it does not include expiration dates, which are necessary to understand the “protection time” statistics. Worse, the Database provides no information with respect to the other 15 “protections,” i.e., non-patent exclusivities.

With some effort, the missing information can be found in the CSV file. The following step-by-step instructions will hopefully make it easier for others interested in following this path.

Beginning on the homepage for the Evergreening Database, click on the “About the Data” hyperlink, which will take you to another page which states:

To download the original dataset, that was used to develop the results for the article May Your Drug Price Be Evergreen, along with information about researching the FDA’s Orange Book, please see:

Robin Feldman, Identifying Extensions of Protection in Prescription Drugs: Navigating the Data Landscape for Large-Scale Analysis, ANN ARBOR, MI: INTER-UNIVERSITY CONSORTIUM FOR POLITICAL AND SOCIAL RESEARCH (2018), https://doi.org/10.3886/E104781V2.

Clicking on the “doi.org” link leads to a webpage of “openICPSR,” which describes itself as “a self-publishing repository for social, behavioral, and health sciences research data” and a “service of the Inter-university Consortium for Political and Social Research (ICPSR).”

There are several files posted on this webpage, including one entitled Orange_Book.csv. Users can download this file after registering with openICPSR.

The CSV file includes 26 entries for ranolazine that presumably correspond to the 26 “protections” reported in the Database. All 26 protections were based either on the eleven patents or on the NCE exclusivity granted by FDA for the first approval of a new active ingredient. How does that add to 26 protections? Each of the 11 patents was counted twice, once for each approved strength of the drug (which comes in dosages of 500 mg and 1 g). However, marketing approval for two strengths of a drug does not extend the duration of the patents, and it is problematic that the methodology underlying the database results in a doubling of the number of “protections,” with the implication that this constitutes evidence of possible evergreening.

One of the patents (U.S. patent number 4,567,264) was counted as three protections, because the duration of that patent was extended by patent term extension (PTE) pursuant to Section 156 of the Patent Act. Congress enacted Section 156 in 1984 as part of the Hatch-Waxman Act for the express purpose of addressing the “distortion” of the patent term experienced by pharmaceutical innovators owing to the lengthy process of achieving FDA marketing approval. Often, by the time a drug has been approved, much (if not all) of the patent term will have elapsed. To compensate for this distortion, Section 156 allows pharmaceutical innovators to extend the duration of one patent covering the drug by a length of time equal to one half of the time between the filing of the Investigational New Drug (IND) application and the submission of an NDA, plus all the time between the submission of the New Drug Application (NDA) and approval of the drug. Pursuant to statute, the maximum amount of PTE that can be awarded under Section 156 is five years, and the amount of PTE awarded can extend the duration of the patent for no longer than 14 years after the drug’s approval date.

Five years of PTE was added to U.S. patent number 4,567,264, which claims ranolazine as a composition of matter. Notably, the original expiration date of this patent was in 2003, three years prior to the drug’s initial approval. With the addition of five years of PTE, the patent term was extended to 2008, a little more than two years after the drug was approved for marketing. But since the patent term (including PTE) runs concurrently with the five-year NCE data exclusivity (discussed below), the patent provided no additional exclusivity beyond that already provided by NCE exclusivity. The Database is misleading to the extent that it implies that the award of PTE constitutes an “artificial” extension exclusivity for ranolazine—PTE was created by Congress for this express purpose, and it is available to all innovators who make a new drug available to patients.

One of the 26 “protections” was simply a request to delist a patent from the Orange Book. It makes no sense to consider a request to delist a patent as an additional “protection” for the drug, but for some reason that is how it is tallied in the CSV file and Database.

To summarize, 24 of the 26 “protections” are accounted for by the 11 patents, including the award of PTE and the request to delist a patent. The remaining two “protections” result from the fact that Gilead received five years of NCE data exclusivity. Like the patents, the NCE exclusivity period was counted twice, once for each approved strength of the drug. Congress created NCE exclusivity as an incentive for pharmaceutical companies to engage in the costly and beneficial activity of securing FDA approval for new pharmaceutical active ingredients, thereby ensuring that innovators receive a minimum of at least five years of exclusivity before any generic company can file an abbreviated NDA (ANDA) seeking approval to market a generic version of the drug. All innovators who succeed in providing a new active ingredient to patients are awarded five years of NCE exclusivity, which runs concurrently with patents. Again, it is misleading for the Database to tally the NCE exclusivity as two additional “protections” for the drug. NCE exclusivity provides a minimum floor of protection for innovators.

Now, what about the 11 patents? Are they evidence of evergreening, i.e., artificial extensions of patent protection? In assessing these patents, it is useful to consider the context from which they arose. Ranolazine was initially identified as a drug target by Syntex in the 1980s, and throughout much of the 1980s and 1990s that company conducted extensive studies of the compound for a variety of indications, including Phase II clinical trials testing its safety and efficacy in humans. Unfortunately, these studies failed to result in an approved drug, due at least in part to the fact that ranolazine is rapidly metabolized once ingested, which resulted in inadequate plasma concentrations of the drug in human subjects. Syntex filed a patent application disclosing ranolazine in 1983 that resulted in the issuance of a patent in 1986 claiming the molecule. This is the composition of matter patent mentioned above, the original term of which expired in 2003 but was extended by PTE to 2008.

In 1996, Syntex (then a subsidiary of Roche) licensed its rights in ranolazine to another drug company, CV Therapeutics. Researchers at CV Therapeutics succeeded in overcoming the problem of rapid metabolism by developing a sustained-released version of the drug. In 1999, the company filed a patent application disclosing sustained-release ranolazine formulations and methods of using them to treat patients. This application resulted in the issuance of a patent in 2001 claiming methods of using the sustained-release formulation of ranolazine to treat patients suffering from angina (U.S. patent number 6,306,607, the “method of treatment patent.”, which expired in 2019). Note that the method of treatment patent was issued years before the initial FDA approval of ranolazine in 2006, and the initial approval was for the sustained-release ranolazine. Generic versions of ranolazine began entering the market in 2019, shortly before the expiration of the method of treatment patent.

What about the other nine? All nine of these patents arose out of continuation applications claiming priority to the original 1999 application and therefore expired on the same day as the method of treatment patent, i.e., 20 years after the filing date of the original parent application. The nine additional patents reflect the fact that the 1999 patent application filed by CV Therapeutics disclosed multiple inventions, addressing different aspects of the company’s discovery of sustained-release ranolazine formulations and their use as therapeutic agents. Patent law’s prohibition against “double patenting” required CV Therapeutics to divide the inventions up into multiple patents, and the PTO examined the various inventions and determined that each merited its own patent. Significantly, because the patents all ran concurrently, and all expired on the same day, they did not extend the period of exclusivity beyond that provided by the initial method of treatment patent.

Finally, what of the Database’s assertion that Gilead benefited from 13 years of “additional” protection time for Ranexa? Presumably, this is time gained from “evergreening”; however, the statistics provided by the Database seem suspect, because they report that Ranexa was approved on January 27, 2006 (which is correct), that its “earliest protection date” was May 18, 2006 (less than four months later), and that its “latest protection date” was May 27, 2019 (which is the expiration date for the method of treatment patent). In other words, the total period of exclusivity reported by the Database was a little less than 13 years and four months, almost all of which the Database characterized as “additional protection time.”

Why did the Evergreening Database allot ranolazine less than four months of “earliest” protection time? There is no explanation in the Database itself, but the CSV file provides the answer. As mentioned earlier, the CSV file includes three entries for the composition of matter patent, accounting for three of the 26 “protections.” One of those entries lists the “expiration date” for the patent as May 18, 2006. It is this entry in the CSV file that resulted in the Database reporting an “earliest protection date” of May 18, 2006, less than four months after the drug was approved. The latest protection date of May 27, 2019 is the expiration date for the method of treatment patent. The 13 years of “additional protection time” is simply the amount of time between these two dates.

There are numerous problems with the methodology used to calculate “additional protection time.” For one thing, the May 18, 2006, expiration date for the composition of matter patent reported in the CSV file is incorrect. The expiration date for the patent was May 18, 2003, and the term was extended by five years of PTE to May 18, 2008 (see the PTO’s Patent Terms Extended Under 35 USC §156, available at https://www.uspto.gov/patent/laws-and-regulations/patent-term-extension/patent-terms-extended-under-35-usc-156, last visited Nov. 29, 2020). The two other entries in the CSV file for the composition of matter patent provide expiration dates of May 18, 2007. We assume that the creators of the Database intended to populate the CSV file with the original expiration date of the patent and the PTE-extended expiration date, but for some reason they got the years wrong—i.e., the actual years were 2003 and 2008, and the creators of the Database erroneously reported them as 2006 and 2007.

However, because they used the erroneous May 18, 2006 expiration date as the “earliest protection date” for ranolazine, the Database allows for less than four months of “earliest” protection time and counted the remaining 13 years of protection provided by the method of treatment patent as “additional.” In fact, if they had used the correct original expiration date for the composition of matter patent, the result would have been an “earliest protection date” that preceded the approval date of the drug, resulting in zero days of initial protection. This illustrates how misleading it would be to assume there is any connection between the “additional protection time” reported in the Database and evergreening activity.

In short, when we look at the raw data underlying the misleading statistics presented by the Database, we see that the innovator enjoyed a little over 13 years of patent protection, based on patents that arose out of the critical inventive activity that enabled CV Therapeutics to transform a failed drug candidate into a successful human therapeutic. Is 13 years of patent protection excessive for ranolazine? We would argue that it is not, particularly when one considers the huge investment and risk that was involved in bringing the drug to market. And Congress did not think so when it enacted Section 156, explicitly allowing pharmaceutical companies to extend the expiration date of their patents up to a maximum of 14 years after initial approval of the drug. The patent system appears to have worked exactly as Congress intended, with all patents and exclusivities expiring and generic versions of the drug entering the market approximately 13 years after the initial approval of Ranexa.

There may be real value in the underlying data that were used to generate the database; however, as it stands, the underlying data are both difficult to access and incomplete. As Ranolazine shows, there are serious flaws in the database and its interpretation of the underlying data that create unwarranted implications of improper evergreening activity.

[1] https://sites.uchastings.edu/evergreensearch/#.X6qg-mhKhM0

[2] https://sites.uchastings.edu/evergreensearch/about/#.X8UdwmhKhM0

[3] In proper context, use of these data from old Orange Book editions is of course fine. But care must be taken to not create misleading implications.

Categories
Patent Law Pharma

CPIP Scholars Examine the Flaws in the Term “Evergreening”

scientist looking through a microscopeIn their new paper, Evergreening of Pharmaceutical Exclusivity: Sorting Fact from Misunderstanding and Fiction, Professors Kristina Acri née Lybecker and Mark Schultz, along with CPIP John F. Witherspoon Legal Fellow David Lund, analyze how the term “evergreening” is used in the context of pharmaceuticals.

After sorting through the vagaries and rhetorical excesses that restrict meaningful discussion, they identify seven categories that capture typical uses of the term:

  • The assertion that the duration of existing patents can generally be “renewed” or “extended,” for very long or indefinite periods;
  • Obtaining additional patents related to a particular pharmaceutical or treatment;
  • The use of laws that allow patent owners to restore some portion of their term lost due to governmental delays;
  • The use of laws that give companies a limited term of exclusive time to market a drug;
  • Regulatory barriers that frustrate potential generic competitors’ ability to enter a market;
  • Business practices that largely rely on marketing to advantage innovators; and
  • Settling lawsuits with generic manufacturers that seek to invalidate a patent.

In addition to identifying practices claimed to be “evergreening,” this paper also discusses the impact and value of these practices. For most situations, the practices reflect specific policies that are having their desired effect, such as the increase in studies of drug safety and efficacy in children brought about by pediatric exclusivity. In some cases, the practices are simply legal impossibilities. Only in a few specific situations related to regulatory requirements do the authors observe strategic opportunities that could plausibly be considered problematic.

Because of the number of practices and the diversity of value those practices bring to pharmaceutical commercialization, the term obscures far more than it illuminates. Discussions about patents, exclusivities, and public health would benefit greatly from discussing the practices and policies specifically, rather than attempting to use a nebulous term such as “evergreening.”

The paper, which started as part of Professor Acri’s work through CPIP’s Thomas Edison Innovation Fellowship, can be found here. The abstract is copied below.

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Evergreening of Pharmaceutical Exclusivity: Sorting Fact from Misunderstanding and Fiction

Abstract

When people use the term “evergreening” to describe pharmaceutical industry practices, they typically display an unwarranted confidence that they know exactly what they mean both descriptively and normatively. However, a consistent and coherent definition of “evergreening” does not appear to exist.

This article surveys legal, academic, trade, and popular sources that use the term “evergreening” to develop a taxonomy of the policies and actions to which the term is applied. We find that the term is used to cover roughly seven categories of circumstances. Our review finds that the use of the term, taken as a whole, is more typified by the diversity of practices to which it applies rather than any consistent meaning. There are some commonalties, but they exist mostly at a general level.

We then analyze these seven categories to determine if the rhetoric matches the reality. Evergreening is most frequently used as a pejorative term, with a common implication that the “evergreener” is engaged in some sort of strategic behavior at least, or perhaps an immoral if not illegal practice. However, the categorical application of a pejorative term such as “evergreening” to any of the general policies and types of actions we examine is unwarranted and inappropriate. Proponents often apply the term to ordinary use of legal rights as they were designed and the concept makes no meaningful distinction between beneficial and problematic actions.

Unfortunately, “Evergreening” is a key concept in health policy that obscures far more than it illuminates. Once the term is stripped of misunderstandings and loose rhetoric, little of value remains. This is not to say that all policies and actions that extend or preserve exclusive rights are prudent or defensible in individual cases. Rather, the discussion regarding patents and public health would gain much clarity and rationality from addressing the disparate things labeled as “evergreening” on their individual merits.

To read the paper, please click here.