[Federal Register Volume 71, Number 149 (Thursday, August 3, 2006)]
[Notices]
[Pages 44031-44032]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E6-12571]


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DEPARTMENT OF HEALTH AND HUMAN SERVICES

Food and Drug Administration

[Docket No. 2006E-0189]


Determination of Regulatory Review Period for Purposes of Patent 
Extension; IPLEX

AGENCY: Food and Drug Administration, HHS.

ACTION: Notice.

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SUMMARY: The Food and Drug Administration (FDA) has determined the 
regulatory review period for IPLEX and is publishing this notice of 
that determination as required by law. FDA has made the determination 
because of the submission of an application to the Director of Patents 
and Trademarks, Department of Commerce, for the extension of a patent 
which claims that human drug product.

ADDRESSES: Submit written comments and petitions to the Division of 
Dockets Management (HFA-305), Food and Drug Administration, 5630 
Fishers Lane, rm. 1061, Rockville, MD 20852. Submit electronic comments 
to http://www.fda.gov/dockets/ecomments.

FOR FURTHER INFORMATION CONTACT: Beverly Friedman, Office of Regulatory 
Policy (HFD-7), Food and Drug Administration, 5600 Fishers Lane, 
Rockville, MD 20857, 301-594-2041.

SUPPLEMENTARY INFORMATION: The Drug Price Competition and Patent Term 
Restoration Act of 1984 (Public Law 98-417) and the Generic Animal Drug 
and Patent Term Restoration Act (Public Law 100-670) generally provide 
that a patent may be extended for a period of up to 5 years so long as 
the patented item (human drug product, animal drug product, medical 
device, food additive, or color additive) was subject to regulatory 
review by FDA before the item was marketed. Under these acts, a 
product's regulatory review period forms the basis for determining the 
amount of extension an applicant may receive.
    A regulatory review period consists of two periods of time: A 
testing phase and an approval phase. For human drug products, the 
testing phase begins when the exemption to permit the clinical 
investigations of the human drug product becomes effective and runs 
until the approval phase begins. The approval phase starts with the 
initial submission of an application to market the human drug product 
and continues until FDA grants permission to market the drug product. 
Although only a portion of a regulatory review period

[[Page 44032]]

may count toward the actual amount of extension that the Director of 
Patents and Trademarks may award (for example, half the testing phase 
must be subtracted, as well as any time that may have occurred before 
the patent was issued), FDA's determination of the length of a 
regulatory review period for a human drug product will include all of 
the testing phase and approval phase as specified in 35 U.S.C. 
156(g)(1)(B).
    FDA recently approved for marketing the human drug product IPLEX 
(mecasermin rinfabate [rDNA origin]). IPLEX is indicated for treatment 
of growth failure in children with severe primary IGF-1 deficiency or 
with growth hormone (GH) gene depletion who have developed neutralizing 
antibodies to GH. Subsequent to this approval, the Patent and Trademark 
Office received a patent term restoration application for IPLEX (U.S. 
Patent No. 5,681,818) from Insmed Inc., and the Patent and Trademark 
Office requested FDA's assistance in determining this patent's 
eligibility for patent term restoration. In a letter dated May 19, 
2006, FDA advised the Patent and Trademark Office that this human drug 
product had undergone a regulatory review period and that the approval 
of IPLEX represented the first permitted commercial marketing or use of 
the product. Thereafter, the Patent and Trademark Office requested that 
FDA determine the product's regulatory review period.
    FDA has determined that the applicable regulatory review period for 
IPLEX is 3,527 days. Of this time, 3,183 days occurred during the 
testing phase of the regulatory review period, while 344 days occurred 
during the approval phase. These periods of time were derived from the 
following dates:
    1. The date an exemption under section 505(i) of the Federal Food, 
Drug, and Cosmetic Act (the act) (21 U.S.C. 355(i)) became effective: 
April 18, 1996. The applicant claims April 24, 1996, as the date the 
investigational new drug application (IND) became effective. However, 
FDA records indicate that the IND effective date was April 18, 1996, 
which was 30 days after FDA receipt of the IND.
    2. The date the application was initially submitted with respect to 
the human drug product under section 505(b) of the act: January 3, 
2005. FDA has verified the applicant's claim that the new drug 
application (NDA) for IPLEX (NDA 21-884) was initially submitted on 
January 3, 2005.
    3. The date the application was approved: December 12, 2005. FDA 
has verified the applicant's claim that NDA 21-884 was approved on 
December 12, 2005.
    This determination of the regulatory review period establishes the 
maximum potential length of a patent extension. However, the U.S. 
Patent and Trademark Office applies several statutory limitations in 
its calculations of the actual period for patent extension. In its 
application for patent extension, this applicant seeks 1,657 days of 
patent term extension.
    Anyone with knowledge that any of the dates as published are 
incorrect may submit to the Division of Dockets Management (see 
ADDRESSES) written or electronic comments and ask for a redetermination 
by October 2, 2006. Furthermore, any interested person may petition FDA 
for a determination regarding whether the applicant for extension acted 
with due diligence during the regulatory review period by January 30, 
2007. To meet its burden, the petition must contain sufficient facts to 
merit an FDA investigation. (See H. Rept. 857, part 1, 98th Cong., 2d 
sess., pp. 41-42, 1984.) Petitions should be in the format specified in 
21 CFR 10.30.
    Comments and petitions should be submitted to the Division of 
Dockets Management. Three copies of any mailed information are to be 
submitted, except that individuals may submit one copy. Comments are to 
be identified with the docket number found in brackets in the heading 
of this document. Comments and petitions may be seen in the Division of 
Dockets Management between 9 a.m. and 4 p.m., Monday through Friday.

    Dated: July 21, 2006.
Jane A. Axelrad,
Associate Director for Policy, Center for Drug Evaluation and Research.
[FR Doc. E6-12571 Filed 8-2-06; 8:45 am]
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