Focus on studies on infectious diseases and cancer, most notably human papillomavirus and cervical and oral cancer, HIV and hepatitis C virus and lymphomas, and Helicobacter pylori and stomach cancer. All studies involve broad international collaborations, mainly with Latin America, Asia and Africa. Over the years she has closely collaborated with several research centers in the United States (National Cancer Institute) and Oxford, especially in respect to meta-analyses and pooled analyses (e.g., cancers of the breast, thyroid, and cervix).