There are few areas in medicine in which patient-parent advocacy groups play such a central and prominent role as in the field of rare diseases. As illustrated by the French Association of Chronic Myeloid Leukemia (LMC France), its contribution is not only focused on its role as participants or key informant related to clinical studies but also on drug information and drug safety. The discovery of tyrosine kinase inhibitors against the BCR-ABL1 oncogenic fusion protein has revolutionized the management of CML, becoming a chronic illness rather than a life-threatening disease. Because ensuring ongoing well-being requires some knowledge, LMC France has built, in synergy with healthcare professionals from its scientific council, a CML-specific, patient-friendly knowledge base including resources and knowledge related to drug information (drug development, generics, pharmacovigilance) and drug safety using several educational tools such as videos, CML support, and CML drug sheets. To disseminate more largely, an e-university learning for regional key informants from LMC France and also CML patients and their caregivers was launched, including a large resources related to drug information and drug safety in synergy with hematologists and clinical pharmacologists.