<qa>  What is the challenge to implement personalized medicine?Challenges to implement personalized medicine include the limitations of molecular testing, tumour heterogeneity and molecular evolution, costs, and the quality and morbidity associated with tumour biopsies. Sequential biopsies are essential to better understand biological markers of response and resistance, and identify predictive or prognostic markers. Despite the scientific rationale for biopsies, incorporating them into practice can be challenging, as in many cases there is no direct advantage to the patient. This project aims to understand the effect of research biopsies on the patient. The Investigator hypothesize by learning more and gaining a better appreciation of the impact on the patient, Investigators will increase the likelihood of achieving serial biopsies. 