Abstract: This study investigated the effectiveness of the case-based study (CBS) teaching method in standardized residency training and evaluated its impact on clinical reasoning, comprehensive competence, and doctor-patient communication skills. In the CBS group, a scenario-driven, interactive approach based on real cases was implemented, whereas the control group received traditional lecture-based instruction supplemented literature review. Outcomes were assessed through examinations basic knowledge, case analysis, and procedural skills using the Set Elicit Give Understand End (SEGUE) framework; and training feedback and satisfaction surveys. Results demonstrated that the CBS group achieved significantly higher mean scores all three examinations the control group (P<0.05). Post-training SEGUE scores improved markedly (P<0.001), higher in the CBS group (P<0.001). These findings suggest that the CBS teaching model enhances oncology residents theoretical knowledge, clinical thinking, procedural skills, and communication abilities, demonstrating its efficacy.

Key words: case-based study, oncology, standardized training, clinical thinking, doctor-patient communication