In the past two decades, immune checkpoint inhibitors (ICIs) have revolutionized cancer treatment, showing promising results against various solid tumors. This study reviews recent developments in ICIs, focusing on new targets like T cell immunoreceptor with Ig and ITIM domains (TIGIT), T cell immunoglobulin and mucin domain-containing protein 3 (TIM-3), and lymphocyte activation gene-3 (LAG-3). These targets aim to overcome resistance mechanisms limiting the effectiveness of current therapies, such as anti-PD-1 and anti-CTLA-4. By identifying and developing these new ICIs, researchers hope to improve treatment outcomes and provide new therapeutic options for cancer patients. 

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