Clinical Trial Details
— Status: Withdrawn
Administrative data
| NCT number |
NCT02144142 |
| Other study ID # |
UCSD 131244.3 |
| Secondary ID |
|
| Status |
Withdrawn |
| Phase |
Phase 2
|
| First received |
|
| Last updated |
|
| Start date |
July 2015 |
| Est. completion date |
July 2022 |
Study information
| Verified date |
November 2020 |
| Source |
University of California, San Diego |
| Contact |
n/a |
| Is FDA regulated |
No |
| Health authority |
|
| Study type |
Interventional
|
Clinical Trial Summary
Unlike healthy control skin, the skin of patients with atopic dermatitis (AD) is frequently
colonized by Staphylococcus aureus (S. aureus), putting these patients at increased risk of
S. aureus skin infections. In addition, research in the investigator's lab has shown that
these patients have fewer protective Staphylococcal species such as Staphylococcus
epidermidis (S. epidermidis) that are known to produce antimicrobial peptides that play a
role in protecting the skin from invading pathogens. In this study, the study team will
attempt to decrease S. aureus colonization and increase colonization by protective Staph
species in AD patients by first culturing the bacteria on subjects' lesional AD skin. The
study team will selectively grow the subject's protective Staph colonies and place them into
a moisturizer. The first part of the study will determine the half-life of the
bacteria-containing moisturizer. The bacteria-containing moisturizer will be applied to a
subject's arm, and the subject will return at four different time points over the next three
days for skin swabs of the arm that will be used to determine the amount and type of bacteria
on the arm at those time points. In the second part of the study, the subject will apply
moisturizer containing his own antimicrobial bacteria to one of his arms for a total of 6
times at a frequency determined by the half-life, which will be computed at the end of the
first part of this experiment. The subject will return prior to the 7th application time
point for skin swabs of the arm to ensure that there are still viable bacteria from the
moisturizer present on the arm. In the third part of the study, each subject will receive
both moisturizer as well as moisturizer plus his own antimicrobial bacteria. The subject will
apply the moisturizer to one arm and the moisturizer plus bacteria to the other arm daily for
a total of 15 days. Subjects will return to the clinic every 5 days for skin swabs and
clinical evaluations. If the moisturizer containing bacteria is able to decrease the S.
aureus colonization on subject's arms, the study team hypothesizes that subjects will have
improvement of their AD symptoms.
Description:
This study will be conducted as three experiments in accordance with the three aims of the
study. Participants will consent to all three of the study experiments separately, as each
experiment will have a different consent form. While individual subjects are able to
participate in all three sub-studies if they are eligible for all three, there is no
requirement for subjects to participate in more than one of the sub-studies. A total of 10
subjects will be enrolled in Experiments 1 and 2, and approximately 14 subjects will be
enrolled in Experiment 3. Given that only approximately 75-80% of AD patients are colonized
by S. aureus, we expect to screen closer to 18-20 subjects to fulfill the inclusion criteria.
Subjects that withdraw from the study will be replaced.
Experiment 1: Determination of the stability of transplanted bacteria on the skin surface
over time
This first portion of the study (Experiment 1) will consist of 7 office visits (Screening,
Culture, Treatment, and 3 Follow-up visits) and one phone call to relay eligibility
information. All office visits will occur at the UCSD Dermatology Clinic. The exact
procedures for each visit are discussed below.
Screening Visit (Visit 1, Day 0) Prior to beginning any study procedures, subjects will first
be asked to review and sign the informed consent form. After obtaining informed consent, the
inclusion/exclusion criteria will be reviewed. A brief medical history and physical exam will
be performed in helping to assess whether the subject meets the required criteria for the
study. Female subjects of child-bearing potential will take a urine pregnancy test in our
office to ensure that they are not pregnant. Patients who meet the inclusion and exclusion
criteria will then have a skin swab performed on the lesional atopic dermatitis skin in one
of their antecubital fossae (Kong et al, 2012 showed that AD subjects colonized by S. aureus
have resident S. aureus bacteria throughout their skin surface, therefore we expect one swab
to be sufficient), as well as a nasal culture swab to detect the presence of S. aureus in the
nares. This will conclude the screening visit. The total time for this visit will be
approximately 30 minutes.
Subjects who do not meet the inclusion/exclusion criteria due to the application or use of
prohibited medications within the timeframe noted will be considered screen-failures. Skin
swabs of these patients will not be performed. These subjects may return for another
screening visit after completing the necessary wash-out period (7 days for topical
medications, 28 days for oral medications) if they are interested in doing so.
Phone (Day 3 +/- 1) Subjects will be notified via telephone within 3 business days whether or
not their skin and nasal swabs grew S. aureus. Subjects with a skin culture positive for
methicillin sensitive S. aureus (MSSA) will be enrolled in the study. A culture visit
appointment will be schedule for these participants. Subjects will be excluded if they have
any of the following: a negative S. aureus skin culture or a skin culture positive for
methicillin-resistant S. aureus (MRSA). The total phone conversation should take
approximately 5 minutes.
Culture Visit (Day 7 +/- 4) Eligible subjects will return for a culture visit within
approximately a week of their screening visit. During this visit we will take four (4)
culture swabs from the subject's non-lesional (no AD) skin on their upper arms. These culture
swabs will be placed in tryptic soy broth (TSB) until processed in the lab, where they will
be used to grow the subject's antimicrobial peptide-producing Staph species to use for the
autologous microbiome transplant. Subjects will also receive a bar of Dove moisturizing soap,
which they will be instructed to use whenever they shower until after the follow-up visit is
complete. Subjects with a positive S. aureus nasal culture at the screening visit (Visit 1)
will also receive a tube of mupirocin ointment. They will be instructed on the application of
mupirocin to the anterior nares bilaterally twice a day starting 5 days prior to their
treatment visit. The total visit will take approximately 10 minutes.
Treatment Visit (Day 28 +/- 7) Eligible subjects with + S. aureus screening cultures will be
enrolled in the study and instructed to return to the clinic approximately 28 days after
their screening visit. This 3-week waiting period will allow laboratory staff to grow and
prepare the subject's endogenous AMP-producing bacteria to be mixed with Cetaphil for
application at the treatment visit. To simulate real-life scenarios as much as possible, the
subject will be allowed to continue their usual activities during this study, including
bathing, showering, and exercising. This visit will begin by reviewing the subject's interim
medical history, including medication history to ensure that he/she did not use any topical
AD treatments on their arms within 7 days or oral AD treatments within 28 days of this visit.
For subjects who had a S. aureus (+) nasal culture at screening visit, a repeat nasal culture
will be performed. For all subjects, a focused physical exam will then be performed of the
subject's bilateral arms to ensure that there is no evidence of cracks, breaks or infections
of the skin on the arms. Next we will pre-treat both of the arms with a regimen of washing
with Dial liquid antibacterial soap, followed by wiping the arm with sterile gauze soaked
with 70%, then 80% alcohol. Once the alcohol has dried, a thin coat of the subject's
individualized AMT cream will then be applied to each arm by the gloved hands of a study
coordinator. Five minutes after applying the cream, a quantitative washing will be performed
on eczematous skin of one antecubital fossae, as well as on a non-lesional area of skin on
the same arm. For each wash, a sterile stainless steel cylinder with an approximate area of
3.5 cm2 will be held firmly to the skin surface, and 2.5 mL of a sterile stripping fluid
(SSFN) will be carefully instilled into the cylinder. The skin will then be massaged for 60
seconds using a sterile rubber policeman. The SSFN will be aspirated with a pipette and
transferred to a sterile test tube. This entire process will be repeated a second time at the
same site and the fluid pooled together. The pooled fluid will be analyzed in the lab via
colony counting methods to determine the number of viable bacteria colonies on the skin
surface. A skin swab of both lesional and non-lesional skin will then be taken. This will
conclude the treatment visit. We expect this visit to take approximately 30 minutes.
Follow-up Visits During follow-up visits, each subject will return to the clinic for a
quantitative wash of their lesional and non-lesional skin and a skin swab of their lesional
and non-lesional skin. The 10 enrolled subjects will be divided into two groups, and each
group will return for follow-up at different time points. The first five patients to enroll
will be assigned to the first group, which will return for follow-up at the following time
points: 1, 4, 8 and 24-hours after the transplant. The next five patients to enroll will be
assigned to the second group, and will return for follow-up at these time points: 1, 2, 4 and
7 days after the transplant. The quantitative wash at the final follow-up time point will
conclude the study for that participant. Each follow-up visit will take approximately 20
minutes.
The average survival of the transplanted Staph species on both lesional and non-lesional skin
will be plotted for each time point. From this data we will be able to calculate the rate of
decline of the bacteria after being transplanted, which will provide us with the bacteria's
half-life.
Experiment 2: To establish the steady-state abundance of autologous microbiome transplant
cream application necessary to achieve a density of transplanted bacteria similar to the
average concentration of microbes on normal skin, approximately 105/cm2
Experiment 2 will consist of 4 office visits (Screening, Culture, Treatment, and Follow-up),
as well as one phone call to relay eligibility information. All office visits will occur at
the UCSD Dermatology Clinic. Subjects who are participating in both Experiment 1 and 2 must
wait at least a period of time equivalent to 10 half-lives of the AMT cream before beginning
the study procedures of Experiment 2. The Screening, Phone Call, and Culture Visits for
Experiment 3 are the same as for Experiment 1. The Treatment Visit and Follow-Up Visits
differ slightly from those in Experiment 1 and will be described below, with changes
underlined.
Treatment Visit (Day 28 +/- 7) Eligible subjects with + S. aureus screening cultures will be
enrolled in the study and instructed to return to the clinic approximately 28 days after
their screening visit for the treatment visit. This 3-week waiting period between the culture
and treatment visits will allow laboratory staff to grow and prepare the subject's endogenous
AMP-producing bacteria to be mixed with Cetaphil for application at the treatment visit. To
simulate real-life scenarios as much as possible, the subject will be allowed to continue
their usual activities during this study, including bathing, showering, and exercising. This
visit will begin by reviewing the subject's interim medical history, including medication
history to ensure that he/she did not use any topical AD treatments on their arms within 7
days or oral AD treatments within 28 days of this visit. For subjects who had a S. aureus (+)
nasal culture at screening visit, a repeat nasal culture will be performed. For all subjects,
a focused physical exam will then be performed of the subject's bilateral arms to ensure that
there is no evidence of cracks, breaks or infections of the skin on the arms. Next we will
pre-treat one arm with a regimen of washing with Dial liquid antibacterial soap, followed by
wiping the arm with 70% followed by 80% alcohol using sterile gauze. Once the alcohol has
dried, a thin coat of the subject's individualized AMT cream will then be applied to one of
the subject's arms by the gloved hands of a study coordinator. Five minutes later, a
quantitative washing will be performed on eczematous skin of the antecubital fossae of the
arm treated with the AMT cream, as well as on an area of non-lesional skin on this same arm.
For each wash, a sterile stainless steel cylinder with an approximate area of 3.5 cm2 will be
held firmly to the skin surface, and 2.5 mL of a sterile stripping fluid (SSFN) will be
carefully instilled into the cylinder. The skin will then be massaged for 60 seconds using a
sterile rubber policeman. The SSFN will be aspirated with a pipette and transferred to a
sterile test tube. This entire process will be repeated a second time and the fluid pooled
together. The pooled fluid will be analyzed in the lab via PCR to determine how many and what
type of bacteria are present. A skin swab of lesional and non-lesional skin will also be
completed. Subjects will then be given single-use aliquots of their own AMT cream and gloves
to take home with them. They will be instructed to apply one of the aliquots to the same arm
it was applied to during the treatment visit at a dosing interval determined based on the
half-life calculated from the results of Experiment 1 for a total of 6 doses (the dose
schedule predicted to achieve steady state). They will be instructed to wash their hands and
put on gloves prior to each application of the cream. This will conclude the treatment visit.
We expect this visit to take approximately 30 minutes.
Follow-up Visit (To occur at the time of the 7th application of the AMT cream) During the
follow-up visit, subjects will return to the clinic for a quantitative wash of their lesional
and non-lesional skin to determine the abundance of S. aureus at this visit. A skin swab of
lesional and non-lesional skin will also be performed. This visit will conclude Experiment 2.
It will last approximately 15 minutes.
Additional considerations: In this experiment, our goal is to establish the steady-state
abundance of AMT using a bacterial density similar to the average concentration of microbes
on normal skin, approximately 105/cm2. Using the results of Experiment 1, we can estimate the
half-life of the bacteria on subject skin surface. It is possible that the AMT cream
half-life as determined in Experiment 1 will be short, possibly even as short as a few hours.
If the AMT cream does show a rapid loss of transplanted bacteria such that it is impractical
to further increase the frequency of application of the AMT (assumed as greater than TID),
and the dose of the AMT cannot be practically increased from standard 108 bacteria/gm,
applied at 10 gm/m2, the subject will apply the maximal practical dose (109 bacteria/gm at
40gm/m2 ) at the maximal practical frequency (TID), and we will do this for one week to
determine how many bacteria are present after this treatment approach. Although this is not
likely from the data of Costello et al. in 2009, we want to have this back-up plan in place
to allow the study to move forward. Although these results would not represent a
steady-state, the data would be sufficient to enable design of a subsequent clinical trial or
to conclude that a long term application approach is not worth further analyses.
Experiment 3: To measure the steady-state abundance of S. aureus on participant's skin
Experiment 3 will consist of 6 office visits (Screening, Culture, Treatment, and 3 Follow-up
visits), as well as one phone call to relay eligibility information. All office visits will
occur at the UCSD Dermatology Clinic. Subjects who have participated in Experiment 2 must
wait at least a period of time equivalent to 10 half-lives of the AMT cream before beginning
the study procedures of Experiment 3. The Screening, Phone Call, and Culture Visits for
Experiment 3 are the same as for Experiment 1. The Treatment Visit and Follow-Up Visits
differ slightly from those in Experiment 1 and will be described below, with changes
underlined.
Treatment Visit (Day 28 +/- 7) Eligible subjects with + S. aureus screening cultures will be
enrolled in the study and instructed to return to the clinic approximately 28 days after
their screening visit. This 3-week waiting period will allow laboratory staff to grow and
prepare the subject's endogenous AMP-producing bacteria to be mixed with Cetaphil for
application at the treatment visit. AMP-producing bacteria will also be screened to ensure
that it is not pathogenic. To simulate real-life scenarios as much as possible, the subject
will be allowed to continue their usual activities during this study, including bathing,
showering, and exercising. This visit will begin by reviewing the subject's interim medical
history, including medication history to ensure that he/she did not use any topical AD
treatments on their arms within 7 days or oral AD treatments within 28 days of this visit.
For subjects who had a S. aureus (+) nasal culture at screening visit, a repeat nasal culture
will be performed. For all subjects, a focused physical exam will then be performed of the
subject's bilateral arms to ensure that there is no evidence of cracks, breaks or infections
of the skin on the arms. The localized SCORAD and Eczema Severity Scale will be completed on
each antecubital fossa. A TEWL meter will then be used to measure the TEWL of each
antecubital fossa. Next we will pre-treat both arms with a regimen of washing with Dial
liquid antibacterial soap, followed by wiping the arms with 70%, then 80% alcohol. Once the
alcohol has dried, a thin coat of the subject's individualized AMT cream will then be applied
to one arm by the gloved hands of a study coordinator, and Cetaphil lotion alone to the other
arm. The two creams will be labeled as either 'Right' or 'Left' to allow the study to be
conducted in a double-blind manner (both the subject and the clinical
investigator/coordinator will be blinded as to which arm received which treatment). Five
minutes later, a quantitative washing will be performed on eczematous skin of both
antecubital fossae as well as on an area of non-lesional skin of both arms. For each wash, a
sterile stainless steel cylinder with an approximate area of 3.5 cm2 will be held firmly to
the skin surface, and 2.5 mL of a sterile stripping fluid (SSFN) will be carefully instilled
into the cylinder. The skin will then be massaged for 60 seconds using a sterile rubber
policeman. The SSFN will be aspirated with a pipette and transferred to a sterile test tube.
This entire process will be repeated a second time and the fluid pooled together. The pooled
fluid will be analyzed in the lab via colony counting methods to determine the amount of
viable bacteria on the skin at this time point. Skin swabs of lesional and non-lesional skin
of both arms will also be taken to determine what type and the abundance of each bacteria
present on the skin. The subject will then receive single-use aliquots of his individualized
AMT cream and Cetaphil lotion alone, as well as gloves, and instructed to apply one aliquot
to its assigned arm at the dosing interval determined in Experiment 1 (but not to exceed
TID). All aliquots will be labeled with either 'Left' or 'Right' depending on which arm they
should be applied to based on whether the aliquot is of control Cetaphil lotion or the AMT
cream. Since the two products are identical in appearance and consistency, subjects should
not be able to distinguish between the two products. All subjects will be instructed to wash
their hands and put on clean gloves before each aliquot application. This will conclude the
treatment visit. We expect this visit to take approximately 60 minutes.
Follow-Up Visits 1, 2 and 3 (Days 33 +/- 2 days, 38 +/- 2 days, and 43 +/- 2 days
respectively) Subjects will return to the clinic approximately every 5 days after the
treatment visit for a follow-up visit. During this visit, any adverse reactions to the AMT
cream will be recorded. Next, the localized SCORAD and Eczema Severity Scale will be used to
score the severity of the subject's eczema on each of his antecubital fossae. The TEWL of
each antecubital fossa will also be measured. Next, a quantitative wash will be performed on
each arm in the region of the antecubital fossa as well as on an area of non-lesional skin on
each arm. A skin swab of the lesional and non-lesional skin from both arms will then be
performed. The subject will receive freshly prepared single-use aliquots of both the AMT
cream and Cetaphil lotion labeled with either 'Left' or 'Right' depending on which arm the
aliquot should be applied to (for follow-up visits 1 and 2 only). These activities will
conclude the study visit and all study-related procedures. Each follow-up visit should take
approximately 45 minutes.
