Recent changes in the environment surrounding community pharmacists include follow-up after dispensing becoming mandatory, initiation of certified pharmacy system with specific functions, with the discussions on post-graduate training, lifelong training and specialization, refill of prescriptions, as well as pros and cons of hospital pharmacies in preparation for the 2022 dispensing fee revision. In this regard, since 2019, I have been receiving training at The Cancer Institute Hospital of Japanese Foundation for Cancer Research (JFCR). In addition, to implementing community pharmacists perspectives into collaboration between community pharmacists and hospital pharmacists, a tracing report model incorporating the Common Terminology Criteria for Adverse Events (CTCAE) ver. 5.0 has been created. And, a regimen of drugs and operation describing necessary supportive care has been published in The Cancer Institute Hospital of JFCR website. As a practice of patient safety management at pharmacies, we are working on the standardization of questionnaire criteria to assess the severity of adverse medication reactions in cancer patients and the measurement of health-related quality of life using EuroQol 5 dimensions 5-level (EQ-5D-5L), introduced with cooperation of universities, hospitals, and pharmacies. As medical care is advancing day by day, especially in cancer medication therapy, patient safety management by pharmacists becomes essential, when dealing with the complexity of administration schedule and the wide variety of side effects. For patient safety management, community pharmacists need to practice with pharmaceutical and medical knowledge, and have skills to acquire and convey information, with a researcher s perspective.