not-yet-known not-yet-known not-yet-known unknown Future work Nitrosamines again! The discovery of nitrosamine carcinogens as contaminants in drugs (also known in foods and likely in some medical device materials, especially rubber) has led to new questions concerning genotoxicity, mutagenicity and human risk of chemicals studied decades ago. I’m back in the saddle again (Heflich, 2024 in press, Elespuru 2024). NCI funded cancer prevention project: integration of information on human genetic risk factors, external exposures, and DNA repair on the development of specific types of cancer. This project is a primary focus for the future.