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Background/aim: To evaluate the research trends in coronavirus disease (COVID-19)., Materials and Methods: A bibliometric analysis was performed using a machine learning bibliometric methodology. Information regarding publication outputs, countries, institutions, journals, keywords, funding and citation counts was retrieved from Scopus database., Results: A total of 1883 eligible papers were returned. An exponential increase in the COVID-19 publications occurred in the last months. As expected, China produced the majority of articles, followed by the United States of America, the United Kingdom and Italy. There is greater collaboration between highly contributing authors and institutions. The "BMJ" published the highest number of papers (n=129) and "The Lancet" had the most citations (n=1439). The most ubiquitous topic was COVID-19 clinical features., Conclusion: This bibliometric analysis presents the most influential references related to COVID-19 during this time and could be useful to improve understanding and management of COVID-19., (Copyright© 2020, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.)

The risk to develop breast cancer varies at least five fold around the world. Migrant women from low incidence countries to the United States experience an increase in risk over several generations. The objectives of this paper are to describe ethnic differences in breast cancer incidence and to review research related to risk factors that may explain these variations. Although ethnic differences can be partially explained by established risk factors, a large proportion of the increase in risk remains unexplained. Hormonal factors, including estrogens, insulin, and growth factors, may offer an explanatory mechanism how increasing caloric intake, decreasing physical activity, changes in nutrients, increasing height, and adiposity affect breast cancer risk. Future research on polymorphisms in genes coding for enzymes that are involved in the chemical activation and detoxification of environmental carcinogens, dietary agents, and endogenous hormones may contribute to the understanding of ethnic differences in breast cancer risk.