Carotene and Retinol Efficacy Trial
- Start Year
- End Year
- Study design
- Clinical trial cohort
- Follow Up
- In the first year after randomization, efficacy participants are contacted four times, by telephone at 3 and 9 months and by visits to the study center at 6 and 12 months. In subsequent years, efficacy participants are contacted by telephone at 4 and 8 months past the randomization anniversary date and have an annual visit at the study center. The active vanguard group is monitored more closely, with semiannual visits.
Omenn, G. S., Goodman, G. E., Thornquist, M. D., Balmes, J., Cullen, M. R., Glass, A., ... & Hammar, S. (1996). Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease. New England journal of medicine, 334(18), 1150-1155.
- Sources of Recruitment
Number of participants
- Number of participants
- Number of participants with biosamples
- Supplementary Information
- Persons at high risk of lung cancer
Availability of data and biosamples