The NIEHS Sister Study is a prospective epidemiological study to examine environmental and familial risk factors for breast cancer and other diseases in a high-risk cohort of 50,000 sisters of women who have had breast cancer. Such sisters have at least twice the risk of developing breast cancer as other women. The frequency of any relevant genes and shared risk factors will also be higher, increasing the statistical power of the study to detect risks. Sisters in the cohort are highly motivated, and response rates and compliance over time continue to be high. Thus, studying these sisters will enhance our ability to assess the interplay of genes and environment in breast cancer risk and to identify potentially preventable risk factors. The prospective design will allow us to assess exposures before the onset of disease and avoid biases common to retrospective studies. The study creates a framework from which to test new hypotheses as they emerge.
Changes in burden and annualized cost merely reflect the anticipated progress and the next scheduled phases of the longitudinal study. With enrollment now complete, total burden request decreases from 194,131 hours over 3 years (in 2006 revision) to 72,218 hours over 3 years (for 2009 revision). This does not however represent a change in Protocol -- merely completion of the Enrollment Phase of the Protocol, and normal as-planned progression of follow-up.
On behalf of this Federal agency, I certify that the collection of information encompassed by this request complies with 5 CFR 1320.9 and the related provisions of 5 CFR 1320.8(b)(3).
The following is a summary of the topics, regarding the proposed collection of information, that the certification covers:
(i) Why the information is being collected;
(ii) Use of information;
(iii) Burden estimate;
(iv) Nature of response (voluntary, required for a benefit, or mandatory);
(v) Nature and extent of confidentiality; and
(vi) Need to display currently valid OMB control number;
If you are unable to certify compliance with any of these provisions, identify the item by leaving the box unchecked and explain the reason in the Supporting Statement.