Recent studies have elucidated various mechanisms underlying immune checkpoint inhibition, particularly focusing on LAG-3 and its role in T cell regulation. Du et al. demonstrated that the spatial proximity of LAG-3 to the T cell receptor (TCR) is critical for its inhibitory function, suggesting that mere binding to MHC class II is insufficient for LAG-3's optimal activity (ref: Du doi.org/10.1016/j.cell.2025.06.004/). This finding highlights the importance of TCR-LAG-3 interactions in modulating T cell activation and autoimmunity. Furthermore, Phelps et al. explored how exercise-induced microbiota metabolites enhance CD8 T cell antitumor immunity, revealing that exercise boosts the efficacy of immune checkpoint inhibitors in melanoma by increasing levels of the metabolite formate, which in turn enhances Tc1-mediated responses (ref: Phelps doi.org/10.1016/j.cell.2025.06.018/). This suggests a novel interplay between lifestyle factors and immunotherapy outcomes. In contrast, Dijkstra et al. investigated subclonal immune evasion in non-small cell lung cancer, using a patient-derived organoid-T cell co-culture platform to analyze immune escape mechanisms at the single-clone level, emphasizing the complexity of tumor heterogeneity in response to immunotherapy (ref: Dijkstra doi.org/10.1016/j.ccell.2025.06.012/). Additionally, the Cancer Immunology Data Engine developed by Gong et al. integrates extensive omics data to identify secreted proteins as potential therapeutic targets, underscoring the need for innovative approaches in cancer immunotherapy (ref: Gong doi.org/10.1016/j.cell.2025.07.004/). Lastly, Tian et al. presented findings from a phase 2 trial comparing neoadjuvant treatments for rectal cancer, revealing that the addition of sintilimab to chemotherapy did not significantly increase adverse events, suggesting a favorable safety profile for combined therapies (ref: Tian doi.org/10.1016/S1470-2045(25)00286-4/).