PRevention of INteractions Between Phytotherapies and CancEr Treatments by a SmartphonE/Tablet Automated SurvEy

The use of herbal treatment, also called phytotherapies, or dietary supplements or specific food (herbs, food or dietary supplements HFDS) is very common and have been evaluated between 30 and 70%, depending on the population and the studies.However, few studies have been made to evaluate the risk of interaction with oncology treatment in real life. Some interaction are very well known by both patients and clinicians, like the inhibition of the cytochrome 3A4 by grapefruit or the induction of the CYP3A4 by Saint John's Wort. However, many other interactions have been demonstrated, like the inhibition of the CYP3A4 by goldenseal extracts (among many others) although this is frequently used phytotherapy, both over the counter or "prescribed" by herb specialists. This study aims at demonstrating that a smartphone or tablet application could be used to prevent significant interaction between phytotherapy or food or dietary supplements with anticancer treatments. The application is used to collect data prospectively that will be analysed for interaction retrospectively. The interactions between phytotherapy have been classified in 4 categories : * likely (clinically relevant data in the literature between the herb and the anticancer treatment either directly or through documented CYP interaction) * possible (animal model or in vitro data in favor of an interaction) * unlikely (clinical data or animal model or in vitro data in favor of no interaction) * unknown (no data available or data from that could not allow a conclusion due to its poor quality or an ambiguous conclusion) The investigators aim at measuring the proportion of "likely" herb-drug interaction (or dietary supplement or food) in a population of patients followed and treated for a cancer, either local or metastatic. The investigators also aim at characterizing the population, quantifying the proportion of patients taking HFDS and, to measure the proportion of "possible" herb-drug interaction.