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Related Concept Videos

Tumor Immunotherapy01:27

Tumor Immunotherapy

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Local Single-Dose Radiation Improves Adoptive Cell Therapy With Tumor-Infiltrating Lymphocytes.

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Radiation therapy (RT) enhances adoptive cell therapy (ACT) by improving tumor-infiltrating lymphocyte (TIL) expansion and T cell infiltration. Combining RT with ACT significantly boosts antitumor activity and complete tumor regression in preclinical models.

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Area of Science:

  • Immunology
  • Oncology
  • Radiation Oncology

Background:

  • The combination of radiation therapy (RT) and adoptive cell therapy (ACT) for cancer treatment is an emerging area of research.
  • The potential of RT to enhance ACT, particularly with tumor-infiltrating lymphocytes (TILs), remains underexplored.

Purpose of the Study:

  • To evaluate the efficacy of combining RT with ACT in a murine model of human papillomavirus (HPV)-positive head and neck squamous cell carcinoma (HNSCC).
  • To investigate the impact of RT administration at two critical time points: pre-tumor resection and on the day of ACT.

Main Methods:

  • Administered single-dose RT (8 Gy) 5 days before tumor resection in a murine HNSCC model.
  • Performed RNA sequencing to analyze chemokine expression post-RT.
  • Expanded TILs ex vivo using interleukin-2 (IL-2) and assessed their reactivity.
  • Conducted ACT with TILs from RT-treated or untreated tumors and evaluated T cell infiltration and antitumor activity.

Main Results:

  • RT preconditioning significantly enhanced ex vivo TIL expansion (96% vs 74%) and increased TNF-α production, indicating improved reactivity.
  • RT increased the expansion of polyfunctional cytotoxic CD8+ TILs and upregulated chemokines, supporting enhanced TIL recruitment.
  • ACT with TILs from RT-preconditioned tumors resulted in superior tumor control, with 50% complete tumor regression compared to 12.5% in controls.
  • RT on the day of ACT improved T cell infiltration and tumor rejection compared to ACT or RT alone.

Conclusions:

  • RT applied before tumor resection enhances TIL expansion and reactivity.
  • RT administered on the day of ACT boosts T cell infiltration and antitumor efficacy.
  • Combining RT with ACT at these distinct time points significantly improves therapeutic outcomes, showing promise for metastatic disease treatment.