Introduction Advances in treatment have transformed cancer from a fatal to a chronic illness. This requires healthcare professionals, particularly nurses, to have advanced knowledge and collaborative skills. However, challenges persist in implementing patient-centered care in the context of evolving treatment complexity. Objectives This study aimed to clarify nurses’ support practices in providing cancer pharmacotherapy at a university hospital in Japan and compare these practices based on nurses’ years of experience. Methods A questionnaire survey was conducted from February to April 2023 among 430 nurses involved in provision of cancer pharmacotherapy at a Japanese university hospital. Nurses were asked about the types of support they provided during care for patients undergoing cancer pharmacotherapy. Nurses’ cancer pharmacotherapy support practices were extracted using factor analysis, and differences in support scores by years of experience were examined. Results Responses were received from 184 nurses (42.8% response rate). Three support factors were identified: “Providing patient-centered cancer pharmacotherapy,” “Management of continued cancer pharmacotherapy treatment,” and “Assessment of and response to physical symptoms.” Scores for “Providing patient-centered cancer pharmacotherapy” were significantly lower than those for the other two factors ( p < .001). The group with ≥10 years of nursing experience had statistically significantly lower practice scores than those with 4–9 years of experience. Conclusions Enhancing nursing education and interprofessional collaboration are crucial to overcome barriers to patient-centered cancer care. Continuous learning opportunities are essential to adapt to evolving cancer treatment protocols and ensure delivery of patient-centered care, particularly for experienced nurses.