The R package multiMiR, with web server is a comprehensive collection of predicted and validated miRNA-target interactions and their associations with diseases and drugs. Within this database, investigators can find clues to potential new treatments for various diseases, including cancer. In addition to helping researchers search for relationships between microRNAs and their genetic targets, multiMiR includes drugs that affect these microRNAs and lists associated diseases.The database combines nearly 50 million records from 14 microRNA data repositories. It also links to research results. Researchers can input names of microRNAs, genes, drugs, diseases, or any combination. Then they can ask the database for validated or predicted genetic targets of microRNAs, or for validated or predicted microRNAs that regulate specific genes (M Fillon, JNCI 106, issue 12, News 3, 2014) Registration not required.