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To measure antigen-specific interferon-secretion by enzyme-linked immunospot (ELISPOT) assay, which measures antigen-specific interferon-secretion.
The goal of this project is to collect information in regards to the immunogenicity of PSA peptides in order to develop a novel therapeutic vaccine. This vaccine will consist of prostate specific antigen (PSA) peptide and Candida skin test reagent. Candida has recently been shown to be a promising new vaccine adjuvant for promoting T-cell responses. It can induce interleukin-12 (promotes T-cell response) secretion by Langerhans cells, the main antigen presenting cells in skin. In a Phase I clinical trial treating women with biopsy-proven high-grade squamous intraepithelial lesions (HSILs), precursors of cervical cancer, a combination of human papillomavirus peptides with Candida was demonstrated to be safe, to induce immune responses to human papillomavirus, and to promote T-helper type 1 (Th-1) response (promotes cellmediated immunity) in vaccine recipients.
For treating prostate cancer, PSA is an ideal antigen as it is expressed in prostate cancer but not in any other organs. The characteristics of peptides that can effectively be used in therapeutic vaccines are their solubility in a single solution, immunogenicity in terms of containing large number of T-cell epitopes (so the vaccine can be used for all patients and not just a few that express certain Human Leukocyte Antigen (HLA) tissue types), and ability to mature Langerhans cells which in turn promotes T-cell activity.
In this protocol the investigators focus on the immunogenicity of candidate peptides.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Blood Draw Only | Other | One time blood draw at time of consent; No treatment |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Blood draw | Other | One time blood draw at time of consent. Blood will be stored until all subjects have been enrolled and then the enzyme-linked immunospot (ELISPOT) assay will be done to measure the antigen-specific interferon secretion. |
| Measure | Description | Time Frame |
|---|---|---|
| Number of Participants With Antigen-specific Interferon- Secretion as Measured by Enzyme-linked Immunospot (ELISPOT) Assay | The spots formed by interferon-gamma-secreting T-cells will be counted with an automated ELISPOT analyzer (AID ELISPOT Classic Reader; Autoimmune Diagnostika GmbH, Strassberg, Germany). The average spot-forming units (SFU) per antigen will be calculated. A response will be considered positive when the average SFU in wells with a given peptide was at least twice that of the average SFU in the no-peptide control wells. | At time of consent |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Konstantinos Arnaoutakis, MD | University of Arkansas | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Arkansas for Medical Sciences | Little Rock | Arkansas | 72205 | United States |
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| ID | Title | Description |
|---|---|---|
| FG000 | Blood Draw Only | One time blood draw at time of consent; No treatment Blood draw: One time blood draw at time of consent. Blood will be stored until all subjects have been enrolled and then the enzyme-linked immunospot (ELISPOT) assay will be done to measure the antigen-specific interferon secretion. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
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| ID | Title | Description |
|---|---|---|
| BG000 | Blood Draw Only | One time blood draw at time of consent; No treatment Blood draw: One time blood draw at time of consent. Blood will be stored until all subjects have been enrolled and then the enzyme-linked immunospot (ELISPOT) assay will be done to measure the antigen-specific interferon secretion. |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Categorical | Count of Participants |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Number of Participants With Antigen-specific Interferon- Secretion as Measured by Enzyme-linked Immunospot (ELISPOT) Assay | The spots formed by interferon-gamma-secreting T-cells will be counted with an automated ELISPOT analyzer (AID ELISPOT Classic Reader; Autoimmune Diagnostika GmbH, Strassberg, Germany). The average spot-forming units (SFU) per antigen will be calculated. A response will be considered positive when the average SFU in wells with a given peptide was at least twice that of the average SFU in the no-peptide control wells. | Posted | Number | participants | At time of consent |
|
at time of enrollment (1 day)
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Blood Draw Only | One time blood draw at time of consent; No treatment Blood draw: One time blood draw at time of consent. Blood will be stored until all subjects have been enrolled and then the enzyme-linked immunospot (ELISPOT) assay will be done to measure the antigen-specific interferon secretion. |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Beth Scanlan | University of Arkansas for Medical Sciences | 5016868274 | bscanlan@uams.edu |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Sep 22, 2015 | Aug 12, 2021 | Prot_SAP_000.pdf |
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| ID | Term |
|---|---|
| D011471 | Prostatic Neoplasms |
| ID | Term |
|---|---|
| D005834 | Genital Neoplasms, Male |
| D014565 | Urogenital Neoplasms |
| D009371 | Neoplasms by Site |
| D009369 | Neoplasms |
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| ID | Term |
|---|---|
| D001800 | Blood Specimen Collection |
| ID | Term |
|---|---|
| D013048 | Specimen Handling |
| D019411 | Clinical Laboratory Techniques |
| D019937 | Diagnostic Techniques and Procedures |
| D003933 | Diagnosis |
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| Participants |
|
| Age, Continuous | Mean | Full Range | years |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Race (NIH/OMB) | Count of Participants | Participants |
|
| Region of Enrollment | Number | participants |
|
|
|
| 0 |
| 10 |
| 0 |
| 10 |
| 0 |
| 10 |
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| D005832 |
| Genital Diseases, Male |
| D000091662 | Genital Diseases |
| D000091642 | Urogenital Diseases |
| D011469 | Prostatic Diseases |
| D052801 | Male Urogenital Diseases |
| D011677 | Punctures |
| D013514 | Surgical Procedures, Operative |
| D008919 | Investigative Techniques |