A Case of Success With Immunotherapy After Changing the Therapeutics Strategy in Non-small Cell Lung Cancer.

Immune checkpoint inhibitors (ICI) have already shown benefit with higher response and survival rates when compared to standard chemotherapy in advanced non-small cell lung cancer (NSCLC). Although there is evidence that radiation and immunotherapy offer good response rates without additional toxicity, these treatments are not currently utilized in our everyday clinical practice to treat advanced disease. We present a case of success of a 50-year-old male with stage IIIC adenocarcinoma of the lung with high PD-L1 expression and no driver mutations whose disease progressed after two cycles of induction chemotherapy. After that, he started systemic treatment with pembrolizumab monotherapy, and there was such a good response that he proposed definitive radiotherapy for the only remaining pulmonary lesion. Stereotactic body radiation therapy (SBRT) was performed with no major toxicity. He is alive, in follow-up for more than two years, with no signs of active oncological disease. Our case represents an example of success, demonstrating a great tumor response with immunotherapy that allowed a patient with advanced non-metastatic NSCLC whose disease had progressed with platinum-based chemotherapy to get radical treatment with SBRT. The failure of the first-line treatment can result in more investigation on the efficacy and benefits of beginning treatment of these kinds of tumors with ICI directly.