Moving immunotherapy ahead of chemoradiotherapy in a "sandwich" model-where tumor reduction is achieved through induction chemo-immunotherapy, immunotherapy is paused during chemoradiotherapy, and then resumed as maintenance post-radiotherapy-has shown promising potential. However, this approach still faces two main challenges: insufficient depth of tumor response and an increased risk of radiation pneumonitis.To address these issues, we investigators have designed a novel high-low mixed-dose irradiation strategy. This approach, combined with two cycles of induction chemo-immunotherapy, aims to achieve rapid tumor regression, improve disease control rates, and reduce overall lung radiation exposure.