Tumors Near Organs at Risk and Particle Therapy Review

Some tumors are located close to organs or structures that are sensitive to radiation, commonly referred to as organs at risk (OARs).

Examples include the brain, spinal cord, optic nerves, eyes, salivary glands, lungs, heart, liver, stomach, bowel, bladder, rectum, kidneys, and major blood vessels.

When a tumor is near these structures, treatment planning becomes more complex. The clinical challenge is to deliver an effective dose to the tumor while minimizing exposure to surrounding normal tissues.

Particle therapy may be reviewed in selected cases due to its ability to concentrate radiation more precisely and limit unnecessary dose beyond the target area. This approach may be relevant for tumors near critical organs, recurrent tumors, pediatric cases, or situations where conventional radiation may pose higher risks to normal tissues.

However, tumor location alone does not determine treatment eligibility. Hospitals evaluate multiple factors, including cancer type, disease stage, tumor size and location, prior treatment history, imaging findings, and the patient’s overall condition.

Recent imaging files, such as CT, MRI, or PET-CT in DICOM format, are often essential to assess whether particle therapy is technically and clinically feasible.

APIS helps coordinate communication and document submission to Korean hospitals for selected international cases.

* Final treatment decisions are determined solely by the treating hospitals and physicians.