On June 18, 2020, District Court of West Virginia found method of
use patent covering Tecfidera® invalid for lack of written description support.
Background:
Biogen is the owner of US 8,399,514 patent entitled, “treatment
for multiple sclerosis” expiring in Feb. 2028. This patent is listed in Orange
Book for the product, Tecfidera® (Dimethyl fumarate) DR capsules. Biogen is the
NDA holder & markets this product in USA.
Mylan sought approval of generic version & thus filed ANDA containing
P-IV certification with USFDA to US’514 patent. Biogen sued Mylan within statutory
period. Mylan also filed IPR in PTAB against same patent in Jul. 2018. PTAB
issued final written decision in Feb. 2020 finding challenged claims not obvious
over cited prior arts. Therefore, Mylan dropped obviousness challenge in
district court & focused on lack of written description support under 35
U.S.C 112.
The independent claim 1 reads:
1. A method
of treating a subject in need of treatment for multiple sclerosis
comprising orally administering to the subject in need thereof a pharmaceutical
composition consisting essentially of (a) a therapeutically effective amount
of dimethyl fumarate, monomethyl fumarate, or a combination thereof, and
(b) one or more pharmaceutically acceptable excipients, wherein the
therapeutically effective amount of dimethyl fumarate, monomethyl fumarate, or
a combination thereof is about 480 mg per day.
Court’s
analysis:
Mylan argued that the ’514 Patent is invalid for lack of written
description because the specification described in 2007 (priority date) bears
no resemblance to the invention claimed in 2011. Specifically, at the time of
filing POSA would not have expected the claimed invention——a 480mg/day dose
of DMF (BID)——to effectively treat MS and
secondly when viewed as an integrated whole, the combination of
selectively-plucked disclosures in the specification of the ’514 Patent fails
to sufficiently describe the claimed invention. According to Mylan, it is only after Phase III trial in 2011 Biogen came to know the effectiveness of 480[mg/day]
dose. Before the priority date of patent, only phase II results were known
& that disclosed 720[mg/day] dose as effective dose to treat MS.
Court agreed with Mylan based on the facts, expert testimony &
held that specification does not demonstrate that the Inventors “Possessed” the
claimed invention at the time of filing of application. Court said that in
order to satisfy the written description requirement of § 112, the inventor
must “‘convey with reasonable clarity to those skilled in the art that, as of
the filing date sought, he or she was in possession of the invention, and
demonstrate that by disclosure in the specification of the patent.’” Nuvo Pharm., 923 F.3d at 1376 (cleaned up)
(citation omitted). Significantly, “actual ‘possession’ or reduction to
practice outside of the specification is not enough.” Ariad Pharm. Inc., 598 F.3d at 1352. “[I]t is the specification
itself that must demonstrate possession.” Court said that the specification of the ’514 Patent begins
with a general discussion of MS but quickly turns to a discussion of how “the
Nrf2 pathway may be activated in neurodegenerative and neuroinflammatory
diseases as an endogenous protective mechanism.” The specification then provides
five methods for screening of the compounds. Biogen argued that, “the ’514
Patent links through Method 4 each of the three recited elements of the
asserted claims: (1) a method of treating MS with (2) DMF and/or MMF (3) at a
dose of 480 mg per day.” But court said that Method 4 is limited in scope and
makes no mention of treating MS with a 480mg/day dose of DMF (BID). Bioge then
pointed out following paragraph from specification & argued that it
provides support for the 480mg/day dose:
“For example, an
effective dose of DMF or MMR to be administered to a subject orally can be from
about 0.1 g to 1 g per pay [sic], 200 mg to about 800 mg per day (e.g., from
about 240 mg to about 720 mg per day; or from about 480 mg to about 720 mg
per day; or about 720 mg per day). For example, the 720 mg per day may be
administered in separate administrations of 2, 3, 4, or 6 equal doses”.
Court said that this passage, however, neither “links” this
“effective dose” to the treatment of MS, nor to a 480mg/day dose of DMF (BID). 480mg
dosing is mentioned only once in this paragraph. Moreover, based on the results
of Biogen’s Phase II study, as of the claimed priority date of February 8,
2007, a POSA would have known that 720mg/day of DMF (TID) is a therapeutically
effective dose for treating MS, and that lower doses, such as 360mg/day of DMF
(TID) and 120mg/day of DMF (QD), are not. Thus, on reading the specification, a
POSA would be drawn to the 720mg/day dose of DMF because of its specific
disclosure & not to 480mg dose. Moreover, this paragraph only discloses DMF
& its dose. It does not discloses treatment of MS. Specification provides
an exhaustive list of diseases that can be treated. Therefore, the method 4 can
be used for a plethora of neurological diseases, and there are no “blaze marks”
that would lead a POSA specifically to MS. Moreover, Biogen’s expert, Dr. Wynn,
conceded on cross examination. Based on his reading of the ’514 Patent, he
testified that he would not know which dose provided in this paragraph would be
most effective for treating MS.
Biogen’s reliance on Example 3 fares no better which is an Experimental
Autoimmune Encephalomyelitis (“EAE”) animal model used for MS. Dr. Wynn never
explained how this experiment teaches a method of treating MS (in humans, not
mice) with a therapeutically effective amount of DMF, i.e., 480 mg/day (BID).
On the contrary, Dr. Lukashev credibly testified that the three examples in the
’514 Patent were part of his research, which “was separate from preclinical
development” and unrelated to the clinical application of DMF in MS. Indeed,
the results of Example 3 “provided evidence of [MMF] and [DMF] activation of
NRF2 in vivo.”
Moreover, extrinsic evidence confirms the lack of written description.
After getting the surprising results from phase III in 2011, Biogen filed different
patent application (US 14/119,373) specifically covering the methods of treating
Multiple Sclerosis with 480 mg/day dose. The specification provided and
discussed in detail a wealth of data generated during Biogen’s Phase III study.
In contrast, the specification in the
’514 Patent included none of this data or information. But because of priority
of May 2011, US’373 application would have faced strong invalidity challenges
because of the ample availability of prior arts. Therefore, Biogen amended its title
and claims of the US 12/526,296 application (parent of US’514 patent, now
abandoned) without amending specification so that it can claim priority date of
Feb. 2007. This strategy came with a cost, however, since Biogen was left with
a specification written in 2007 that bore no resemblance to the ’514 Patent’s
title and claimed invention——a method of treating MS with a therapeutically
effective amount of DMF, i.e., 480mg/day —an invention that no one knew would
work until April 2011 when Biogen received the results of its Phase III study.
Court said that, in sum, Biogen has attempted to satisfy the
written description requirement of § 112 by selectively plucking specific words
from the specification that correspond to each element of the claimed
invention. The Federal Circuit has squarely rejected this approach. [Nuvo Pharm., 923 F.3d at 1380]. The
’514 Patent thus must be viewed as an integrated whole rather than a sum of its
parts. As of February 8, 2007, inventors did not “possess” the claimed
invention——a method of treating MS with a therapeutically effective amount
of DMF, i.e., 480mg/day (BID) & thus Mylan has established by clear and
convincing evidence that the asserted claims of the ’514 Patent are invalid for
lack of written description.