USDOE Human Subjects Research Database, Fiscal Year 2002

University of California - Davis Cancer Center

Public Information Contact:

Dr. Zelanna Goldberg
UCDMC-Cancer Center
4501
Dept. of Radiation Oncology
Sacramento, CA 95817

Phone: 916-734-7749
Fax: 916-454-4614
E-mail: slmorey@ucdavis.edu

Institutional Review Board (IRB):

Human Subject Projects:

Number of Human Subjects projects reported: 1

UCDCC-01-83294

"Effects of Low Dose Ionizing Radiation on Gene Expression in Human Subjects Undergoing Radiotherapy"

Project Identifier: UCDCC-01-83294

"Effects of Low Dose Ionizing Radiation on Gene Expression in Human Subjects Undergoing Radiotherapy"

Principal Investigator: Dr. Zelanna Goldberg, University of California - Davis Cancer Center

Project started in: 2001

Project Funding Information:

Funding for Human Subjects Research:

DOE: Office of Biological and Environmental Research (OBER)

$30,000.00 (Est.) for: Fiscal Year 2002

Information on Use of Human Subjects:

This project does not involve the use of multiple protocols/subprojects.

Institutional Review Board (IRB) Review:
Type of Review: Full Board
Approving Institution: University of California - Davis Cancer Center
Most recent approval: 05/01/02
IRB approval number: 994047

Number of human subjects who participated in this project/protocol/subproject in the last reporting period: 0
Reporting period for number of human subjects: Fiscal Year 2002

Type(s) of Human Subjects Involvement:

External use of ionizing radiation on human subjects:

• For clinical research
• Other. Explain:

Standard radiation therapy given and biopsy taken for skin analysis. In this fiscal year no patients have been recruited.

Other types of human subjects involvement. Explanation:

Collection of human skin resected for aesthetic purposes that is unlinked from any identifying data and otherwise would be discarded.

(a. Objectives, b. Methodology, c. Ionizing Radiation, Radioactive Substances, or Chemical Substances to which human subjects are exposed, d. Involvement of Human Subjects [d.1. procedures used, d.2. risks if any])

Several investigations have demonstrated that significant biological effects can occur in animals, animal cells, immortalized human cell lines, and primary human cells after exposure to doses of ionizing radiation (IR) in the <1-10 cGy region. Examples of such effects include the induction of adaptive responses in which low dose exposures render cells less radiosensitive in response to a subsequent bout of exposure to higher dose IR, increases in cell proliferation, and increases in the ability of cells to repair some forms of DNA damage. Other evidence suggests low doses of IR, especially high Linear Energy Transfer (LET) alpha particles, can induce more overtly untoward effects, e.g., mutations, cell transformation and genomic instability. Little information, however, is available as to how these and other observations made with cultured cells mimic or even pertain to the actual in vivo condition, especially in humans. Yet, such knowledge is ultimately required for reducing the uncertainty of assessing human risks due to low dose IR (LDIR) exposures, as may be encountered in a variety of environmental scenarios. Toward filling this information void, the proposed project uses biopsied tissues from informed and consenting volunteers who are to receive radiation therapy. Modern dosimetry utilizing computerized tomography based 3-dimensional radiation treatment planning provides accurate calculations of radiation dose delivered to target tissue and peripheral tissue outside of the high dose region. The target volume receives therapeutic dose, e.g., 2 Gy, whereas tissue sites and volumes that receive far lesser doses, i.e., 1-10 cGy can be defined, biopsied and subjected to further study ex vivo along with tissue samples from the primary target sites. This in vivo exposure system can also provide information on adaptive or other responses after repeated exposures since patients receiving radiation with curative intent are radiated daily, 5 days a week, for 6-8 weeks. A further advantage of using patient biopsies is that of gaining insight into the cellular and molecular responses to very low dose IR in normal tissue, i.e., three dimensionally configured in an otherwise undisturbed microenvironment with intact vasculature. Further, freshly explanted tissue samples can be subjected to additional manipulation, like re-irradiations with higher dose IR.