Individual Study / CTS

California Teachers Study

California Teachers Study

CTS logo
Initiatives -
To document high breast cancer incidence rates of California teachers and to investigate emergent hypotheses in the etiology of breast and other cancers. ** General contact:**
Start Year
California Breast Cancer Act of 1993, the California Departmentof Health Services, and grant CA77398 from the National Cancer Institute, US National Institutes of Health.
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Investigators Contacts
  • Dr. Prof. Elena Martínez
    University of California
  • Dr. Prof. James Lacey
    Beckman Research Institute of City of Hope


Study design
Population cohort
Follow Up
After baseline questionnaire 6 subsequent mailed questionnaires have been administered to update the baseline data and collect new information on exposures, risk factors, and health outcomes of emerging interest. Last questionnaire (Q6) was collected on 2017 - 2019.

Marker Paper

Keegan, T. H., Chang, E. T., John, E. M., Horn-Ross, P. L., Wrensch, M. R., Glaser, S. L., & Clarke, C. A. (2007). Recent changes in breast cancer incidence and risk factor prevalence in San Francisco Bay area and California women: 1988 to 2004. Breast cancer research : BCR, 9(5), R62.

PUBMED 20210979


Sources of Recruitment
  • Individuals

Number of participants

Number of participants
Number of participants with biosamples
Supplementary Information
California public school teachers, administrators, and other school professionals. All women.


Availability of data and biosamples


Availability of access information

On the study website :