Nowadays, Interactive Visualization has acquired growing importance, particularly in web-oriented environments. Modern web application struggles to provide as intuitive as possible interfaces, to guaranty fast and accessible data visualization. In this context, a web platform for cancer genomic data management as the LAS (Laboratory Assistant Suite), which supports the research activities at Cancer Institute IRCCS Candiolo, has to deal with user interaction and Interactive Data Visualization. Currently, this platform provides a query module allowing users to query different distributed databases from a single easy-to-use interface. The module, in fact, gives the possibility to build a graphical representation of the query, also to users without any knowledge of underlying databases' structures and technology (such as query language).