Rapid Arc-SBRT: Non-Invasive Immune Adjuvant for Advanced Stage Non-Small Cell Lung Carcinoma.

In conjunction with radio-chemotherapy, pulmonary resection is recommended for early-stage nonsmall- cell lung carcinoma but not for advanced-stage NSCLC patients having high-grade metastatic lesions. In these cases, the rapid Arc-Stereotactic body radiotherapy (Ra-SBRT) technique offers a therapeutic advantage by delivering focal irradiation to metastatic lung lesions and reduces the bystander toxicity to normal tissues. We have previously demonstrated that Ra-SBRT ablates metastatic lesions and induces tumor immune rejection of metastatic tumors by promoting in situ programming of M2 TAM towards M1-TAM and infiltration of Siglec-8+ Eosinophils. Most interestingly, Ra SBRT has very low abscopal impact and spares normal tissues, which are the significant limitations with conventional radiotherapy. In view of this and the immune adjuvant potential of Ra SBRT, it promotes normalization of aberrant vasculature and inhibits the metastatic potential of NSCLC lesions. In view of this, we here propose that Ra-SBRT indeed represents an immunogenic approach for the effective management of advanced-stage NSCLC.