In developing countries, patients with limited medical knowledge often struggle with treatment plans due to numerous options. Explainable Artificial Intelligence (XAI) can help patients understand treatment options and engage in shared decision-making (SDM) for treatment decisions. However, current XAI systems typically provide one-size-fits-all explanations that fail to address user needs for building trust. This progress paper argues that interactive XAI offers dynamic functionality, enhancing patients' competence and empowering them to actively engage in SDM for optimal treatment choices. We aim to Investigate various interactive XAI designs for cancer treatment recommendations and examine their effects on building patients' trust. We plan to conduct two sequential studies in Africa, where qualitative results will inform the quantitative study by identifying user motivational factors (explanandum and explanans) for explanations. The identified user needs from Study 1 will enhance the existing XAI system by incorporating users' motivational factors into the design, thereby fostering trust.