Media Fills for Validation of Aseptic Preparations for Positron Emission Tomography

Administrative guidance, not enacted legislation. This captured publisher edition preserves the listed document and attachments; later developments are not independently consolidated.

Guidance
Media Fills for Validation of Aseptic
Preparations for Positron Emission
Tomography (PET) Drugs
U.S. Department of Health and Human Services
Food and Drug Administration
Center for Drug Evaluation and Research (CDER)
April 2012
Current Good Manufacturing Practices (CGMP)

Guidance
Media Fills for Validation of Aseptic
Preparations for Positron Emission
Tomography (PET) Drugs
Additional copies are available from:
Office of Communications
Division of Drug Information, WO51, Room 2201
Center for Drug Evaluation and Research
Food and Drug Administration
10903 New Hampshire Ave.
Silver Spring, MD 20993-0003
Phone: 301-796-3400; Fax: 301-847-8714
druginfo@fda.hhs.gov
http://www.fda.gov/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/default.htm
U.S. Department of Health and Human Services
Food and Drug Administration
Center for Drug Evaluation and Research (CDER)
April 2012
Current Good Manufacturing Practices (CGMP)

TABLE OF CONTENTS
I. 	INTRODUCTION..............................................................................................................................................1
II. 	BACKGROUND ................................................................................................................................................1
III. 	QUESTIONS AND ANSWERS ...................................................................................................................2
A. 	W HAT IS A MEDIA FILL? ...................................................................................................................................2
B. 	W HAT IS THE MEDIA FILL DESIGNED TO EVALUATE? ........................................................................................2
C. 	W HAT ARE THE STEPS INVOLVED IN A MEDIA FILL? .........................................................................................3
D. 	H OW DO I CHOOSE THE GROWTH MEDIUM? ......................................................................................................4
E. 	H OW OFTEN SHOULD A MEDIA FILL BE PERFORMED?........................................................................................5
F. 	A MEDIA VENDOR IS TYPICALLY QUALIFIED BY TESTING THREE BATCHES OF MEDIUM . H OW DO I DO THAT?..5
G. 	W HAT IS GROWTH PROMOTION TESTING? H OW IS IT USED IN PET P RODUCTION? ...........................................5
H. 	W HAT IS THE DIFFERENCE BETWEEN A GROWTH PROMOTION TEST AND A POSITIVE CONTROL ?.......................6
I. 	W HEN DO I USE A POSITIVE CONTROL?.............................................................................................................6

Contains Nonbinding Recommendations
Guidance1
Media Fills for Validation of Aseptic Preparations for Positron Emission
Tomography (PET) Drugs
This guidance represents the Food and Drug Administration's (FDA's) current thinking on this topic. It
does not create or confer any rights for or on any person and does not operate to bind FDA or the public.
You can use an alternative approach if the approach satisfies the requirements of the applicable statutes
and regulations. If you want to discuss an alternative approach, contact the FDA staff responsible for
implementing this guidance. If you cannot identify the appropriate FDA staff, call the appropriate
number listed on the title page of this guidance.
I. 	INTRODUCTION
This guidance is intended to help manufacturers of positron emission tomography (PET) drugs
meet the requirements for the Agency’s current good manufacturing practice (CGMP)
regulations for PET drugs (21 CFR part 212). Most PET drugs are designed for parenteral
administration and are produced by aseptic processing. The goal of aseptic processing is to make
a product that is free of microorganisms and toxic microbial byproducts, such as bacterial
endotoxins. A media fill is the performance of an aseptic manufacturing procedure using a
sterile microbiological growth medium, in place of the drug solution, to test whether the aseptic
procedures are adequate to prevent contamination during actual drug production. Media fill
procedures recommended in this guidance apply only to sterile PET drugs manufactured by
aseptic processes under 21 CFR part 212.
FDA's guidance documents, including this guidance, do not establish legally enforceable
responsibilities. Instead, guidances describe the Agency's current thinking on a topic and should
be viewed only as recommendations, unless specific regulatory or statutory requirements are
cited. The use of the word should in Agency guidances means that something is suggested or
recommended, but not required.
II. 	BACKGROUND
In 1997, Congress passed the Food and Drug Administration Modernization Act (Public Law
105-115) (the Modernization Act). Section 121 of the Modernization Act directed FDA to
establish appropriate approval procedures and Current Good Manufacturing Practices (CGMP)
for PET drugs. The procedures were finalized and an implementation timeline was instituted on
December 10, 2009, when FDA published regulations that described the minimum CGMP
standards that each PET drug manufacturer is to follow during the production of a PET drug.2
1 This guidance has been prepared by the PET Drugs Working Group in the Center for Drug Evaluation and
Research (CDER) at FDA.
2 The regulations, CGMP guidance, and supportive information, including historical documents, are available at
http://www.fda.gov/Drugs/DevelopmentApprovalProcess/Manufacturing/ucm085783.htm.

Contains Nonbinding Recommendations
Under the requirements of section 121, within 2 years following that publication date, a new
drug application (NDA) or abbreviated new drug application (ANDA) must be submitted for any
PET drug marketed for clinical use in the United States. Accordingly, PET drug application
submissions should have been received by the Agency on or before December 12, 2011. In early
December 2011, FDA decided that it would exercise enforcement discretion with regard to the
submission of applications until June 12, 2012. Until June 12, 2012, FDA does not intend to
take enforcement action against a PET facility currently producing PET drugs for clinical use for
a failure to submit a new drug application by December 12, 2011, provided that the facility
complies with all other FDA requirements, including current good manufacturing practices
(CGMPs). FDA will not exercise enforcement discretion after June 12, 2012. Therefore, if a
facility wishes to continue to produce PET drugs for clinical use after June 12, 2012, they must
have submitted a new drug application (NDA) or an abbreviated new drug application (ANDA)
by that date, or be producing the drugs under an investigational new drug application (IND). PET
producers who are unable to submit an NDA or ANDA by June 12, 2012 or operate under an
IND must find a new supplier who has submitted an NDA or ANDA. All PET producers must be
operating under an approved NDA or ANDA, or effective IND, by December 12, 2015.
Recognizing that many PET drug producers are unfamiliar with the drug approval process, FDA
issued the guidance PET Drug Applications – Content and Format for NDAs and ANDAs,3 and
held a public meeting in March 2011 to assist applicants in preparing NDAs and ANDAs for the
three most commonly used PET drugs. In comments to the guidance and in questions raised at
the public meeting, stakeholders requested that FDA provide guidance on media fills for
validation of aseptic preparation for PET drugs. This guidance is being issued in response to
these requests and is designed to help manufacturers of PET drugs comply with FDA
regulations.
III. 	QUESTIONS AND ANSWERS
A. 	What is a media fill?
A “media fill” (sometimes known as a “process simulation”) is the performance of an aseptic
manufacturing procedure using a sterile microbiological growth medium in place of the drug
solution. Microbiological growth medium is used in place of the drug solution during media fills
to test whether the aseptic procedures are adequate to prevent contamination during actual drug
production. A media fill is one part of the validation of an aseptic manufacturing process.
B. 	What is the media fill designed to evaluate?
The media fill should evaluate the aseptic assembly and operation of the critical (sterile)
equipment, qualify the operators and assess their technique, and demonstrate that the
environmental controls are adequate to meet the basic requirements necessary to produce a
sterile drug by aseptic processing. The media fill does not validate the ability of the filter to
sterilize growth media.
3 We update guidances periodically. To make sure you have the most recent version of a guidance, check the FDA
Drugs guidance Web page at
http://www.fda.gov/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/default.htm.
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Contains Nonbinding Recommendations
C. 	What are the steps involved in a media fill?
1. 	Design
A media fill should be carefully designed to ensure that the simulation is representative of
all the aseptic manipulations performed during production. These include preparation
and assembly of the product containers, transfer of the product containers to the fill area,
and all process steps downstream from the “sterilizing filter” up to product release,
including packaging into finished product containers. Finished product containers with
medium should then be incubated to permit the growth of microbial contamination in any
containers. Microbiologically contaminated containers are expected to exhibit observable
evidence of microbiological contamination after suitable incubation. The same type and
source of containers should be used for media fills as are used in routine production.
Media fills should be conducted in the same locations where the production occurs and
employ the broadest scope of possible manipulations that could occur during production.
Every aseptic manipulation during production up to the point of finished product release
should be included in the media fill. Because each PET finished product container is to
be sampled aseptically prior to release, sample withdrawal and any adjustments should be
simulated as well.
The media fill is an experiment and therefore should include controls. These controls are
independent of the quality audit of the growth medium (i.e., growth promotion testing).
A positive control for a media fill is a sealed product container of medium that is
inoculated with a small number (i.e., less than 102) of microorganisms. Inoculation of the
positive control container should be done in an area separate from the critical
manufacturing area. Consult United States Pharmacopeia (USP) Chapter 71>, Sterility
Tests, for appropriate organism selection (one species is enough). To ensure the absence
of false positive results, a negative control should be included to demonstrate that the
medium was sterile to begin with. A negative control may be prepared by preincubating
the medium, or by aseptically transferring medium into a separate suitable sterile
container and incubating the control simultaneously with the media fill test containers.
The controls should be incubated under the same conditions as the media fill containers.
These controls may not need to be repeated when multiple media fills are being done
within a week and use the same lot of growth medium.
All steps intended for aseptic manufacturing should be reproduced in the media fill,
including sampling and dilution of the final product. All personnel involved in the
aseptic manufacture of the drug product should participate in at least one media fill per
year. All processing steps that the operator normally performs during aseptic
manufacturing should be simulated.
The simulation process should duplicate the actual production process where the aseptic
steps are conducted, from the set-up of the vial assemblies to the transfer of the bulk drug
from the sterilizing filter into the final containers that are ready for release. A connection
to the container of sterile medium may be substituted in place of the filter. Alternatively,
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Contains Nonbinding Recommendations
a filter may be included during media fills, but the filter should not be used to sterilize the
growth medium. If the process is expected to include the addition of sterile diluent to
adjust the strength following radionuclidic assay, sterile medium should be added in the
same manner during the media fill. The temperature of the medium should be the same
temperature as the drug solution would be during manufacture (e.g., ambient). If
multiple vials are assembled, stored, and used over a period of days, the simulation
should use vials that have been assembled in advance and stored as they would be during
actual production.
After the final product container is filled and ready for release, it should be incubated in a
temperature-controlled incubator. Although USP <71> recommends incubation at 20o–
25oC for the aerobic growth medium, as a practical matter any controlled temperature
between 20o and 35oC would work for media fills. However, the “controlled
temperature” should be specified in your procedures and be maintained within a range
that does not exceed ±2.5oC. The incubation period of a media fill should be no less than
14 days and the containers should be examined every 2 or 3 days.
All steps in a media fill should be done in the same locations as the drug production
steps. If the product container is filled within the hot cell, then the media fill should also
be performed in the hot cell. If it is not filled in the hot cell, then the media fill does not
need to be performed there either.
The synthesis box is generally located upstream from the sterilizing filter and is not
considered a sterile component or part of the aseptic operations. In such cases, do not
include the synthesis unit in the simulations.
2. 	Preparation for the Test
Once the media fill procedures are established, all of the components necessary for the
simulation should be assembled, including all of the equipment used in the aseptic part of
the process. Media to be used in the simulation may be obtained commercially or
prepared on site, and should be sterile.
When media are prepared on site, sterilization should be conducted using a validated
process such as steam autoclave. Filtration is not recommended to sterilize the growth
medium.
D. 	How do I choose the growth medium?
The most commonly used growth medium is soybean casein digest medium (SCDM), which is
commercially available under various names such as Trypticase Soy Broth. A recipe for this
medium is found in USP <71>. Recipes for SCDM in other pharmacopeia may have slight
variations from the USP, but are acceptable. Other general growth media are available, but their
use may not be as practical and may require justification.
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Contains Nonbinding Recommendations
Medium from a qualified commercial vendor may be used by multiple PET facilities for media
fills. Shipping, storage, preparation, and handling procedures should be carefully designed,
documented, and followed to ensure media integrity and stability. Commercially prepared media
should be used within the label’s shelf life and stored according to the label’s recommendations.
E. 	How often should a media fill be performed?
To initially qualify an aseptic process at a specific facility, three media fills should be conducted
on three separate days at that facility using the specific production process that is being qualified.
Additionally, media fills should be conducted whenever significant changes are made to the
aseptic process (e.g., changes in personnel, components, or equipment) and whenever there is
evidence of a failure to maintain product sterility. Media fills performed to validate an aseptic
process at a specific facility should be done by an operator who previously has been trained and
qualified in aseptic techniques (e.g., proper gowning, disinfection practices, handling sterile
materials).
Media fills are an important element of operator qualification. To become a qualified operator
for PET drug product production, an operator should perform three media fills on three separate
days. A qualified operator should perform a media fill at least annually.
F. 	A media vendor is typically qualified by testing three batches of medium. How do I
do that?
Three commercially available batches/lots of medium from a single supplier should be subject to
quality control tests. These tests should include visible inspection, pH, sterility, and growth
promotion. Results of this testing should conform to the results reported in the certificate of
analysis (CoA). You can refer to USP <71> for conduct of growth promotion tests.
Many vendors will have samples of different batches available for purchase and testing. If three
different batches are not available initially, then it may be necessary to test each of the first three
incoming batches for conformance to the CoA.
According to USP <71>, SCDM should be sterile (confirmed by incubating samples for 7 days at
a defined controlled temperature), pH 7.3 (±0.2), and able to permit growth of selected aerobic
species (e.g., Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa). For media
fills, use of only one species of bacteria is necessary once a media vendor is qualified. Media
qualification programs should periodically verify the full CoA and growth promotion capability
to ensure continuing vendor reliability.
G. 	What is growth promotion testing? How is it used in PET production?
A growth promotion test ensures that the medium used in the media fill will support the growth
of contaminating microorganisms. This is an essential control for media fills because the desired
test result is “no growth” and only by demonstrating the medium’s ability to support microbial
growth can the negative result be relied upon. Growth promotion testing should be performed on
the growth medium used in media fills. This may be performed by inoculating a portion of the
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Contains Nonbinding Recommendations
batch with a small number (≤102) of microorganisms to confirm that the medium supports
growth.
When the medium is prepared “in-house” (at the site of the PET drug manufacture), a growth
promotion test should be performed for each batch of medium prepared. Medium should be
prepared using autoclave sterilization processing and not by sterilizing filtration.
A “ready to use” liquid medium supplied from a commercial vendor should be confirmed as
suitable by growth promotion and other testing to confirm that it meets specifications and
conforms to its CoA. Once a supplier has been demonstrated to provide consistently suitable
medium, the CoA and positive control will suffice to establish the medium’s suitability for use in
media fills (the positive control will be used in lieu of demonstrating growth promotion
potential).
H. 	What is the difference between a growth promotion test and a positive control?
Growth promotion testing confirms the medium’s ability to support growth. Growth promotion
testing is commonly done before using the medium in an experiment. A positive control tests the
ability of the test method to result in a positive outcome and is commonly done concurrently with
an experiment.
Media fill positive control shows that the medium in the drug product container will support
growth after exposure to the filling process. The positive control should be a container filled as
part of a media fill. The positive control test may serve as the growth promotion test for the
medium, as long as a qualified vendor is being used.
I. 	When do I use a positive control?
A positive control is needed for each media fill that is performed using a single batch of medium.
As stated previously, a positive control in the media fill may also serve as the growth promotion
test of the medium (from qualified vendor) employed for the media fill. When performing a
media fill, the positive control test may be done simultaneously with the media fill by inoculating
a vial of medium from the same batch used for the media fill. It is also permissible to perform a
positive control at the end (after incubation) of a media fill by inoculating an uncontaminated
media fill test container and returning it for additional incubation. Inoculation of the positive
control container should be done in an area separate from the critical manufacturing area.
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