Problem description: evidence is building that matching targeted agents to tumor characteristics can improve outcomes. Such reports have fueled interest among patients and physicians to use molecular testing for treatment planning when standard treatment options have been exhausted. When oncologists aim to provide such personalized treatment to their patients though, obtaining the drugs can be challenging since off-label prescribing, while legal, is generally not reimbursed by insurance companies. Furthermore, outcomes of off-label treatment in routine clinical practice are not systematically recorded. As a result, the research and clinical communities have limited insight in these outcomes, leading to repetitive use of ineffective treatment for some tumor types, while effective treatment strategies might be missed for others. The latter is especially relevant for 'orphan diseases', that are too rare to conduct formal phase II and III trials. In summary, there is a lack of access to potentially effective therapy on one hand, and a lack of knowledge on broader use of such therapies on the other, altogether leading to sub-optimal use of available resources.