Laser therapy for cancer
Laser therapy uses a very narrow, focused beam of light to shrink or destroy cancer cells. It can be used to cut out part or all of tumors without damaging other tissue.
Cancer
Cancer is the uncontrolled growth of abnormal cells in the body. Cancerous cells are also called malignant cells.
Read Article Now Book Mark ArticleTumors
A tumor is an abnormal growth of body tissue. Tumors can be cancerous (malignant) or noncancerous (benign).
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Laser therapy is often given through a thin, lighted tube that is put inside the body. Thin fibers at the end of the tube direct the light at the cancer cells. Lasers are also used on the skin.
How Laser Therapy is Used
Laser therapy can be used to:
- Destroy tumors and precancerous growths
- Shrink tumors that are blocking the stomach, colon, or esophagus
- Help treat cancer symptoms, such as bleeding
- Treat cancer side effects, such as swelling
- Seal nerve endings after surgery to reduce pain
- Seal lymph vessels after surgery to reduce swelling and keep tumor cells from spreading
Lasers are most often used with other types of cancer treatment such as radiation and chemotherapy.
Radiation
Radiation therapy uses high-powered radiation (such as x-rays or gamma rays), particles, or radioactive seeds to kill cancer cells.
Read Article Now Book Mark ArticleChemotherapy
The term chemotherapy is used to describe cancer-killing drugs. Chemotherapy may be used to:Cure the cancerShrink the cancerPrevent the cancer from ...
Read Article Now Book Mark ArticleSome of the cancers laser therapy can treat include:
- Breast
Breast
Breast cancer is cancer that starts in the tissues of the breast. There are two main types of breast cancer:Ductal carcinoma starts in the tubes (du...
Read Article Now Book Mark Article - Brain
- Skin
- Head and neck
- Cervical
Cervical
Cervical cancer is cancer that starts in the cervix. The cervix is the lower part of the uterus (womb) that opens at the top of the vagina.
Read Article Now Book Mark Article - Lung
Lung
Lung cancer is cancer that starts in the lungs. The lungs are located in the chest. When you breathe, air goes through your nose, down your windpipe...
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Types of Laser Therapy
The most common lasers for treating cancer are:
- Carbon dioxide (CO2) lasers. These lasers remove thin layers of tissue from the surface of the body and the lining of organs inside the body. They can treat basal cell skin cancer and cancers of the cervix, vagina, and vulva.
- Argon lasers. These lasers can treat skin cancer and are also used with light-sensitive medicines in a treatment called photodynamic therapy.
Photodynamic therapy
Photodynamic therapy (PDT) uses a medicine together with a special type of light to kill cancer cells.
Read Article Now Book Mark Article - Nd:Yag lasers. These lasers are used to treat cancer of the uterus, colon, and esophagus. The laser-emitting fibers are put inside a tumor to heat up and damage the cancer cells. This treatment has been used to shrink liver tumors.
Benefits of Laser Therapy
Compared to surgery, laser therapy has some benefits. Laser therapy:
- Takes less time
- Is more precise and causes less damage to tissues
- Leads to less pain, bleeding, infections, and scarring
- Can often be done in a doctor's office instead of a hospital
The downsides of laser therapy are:
- Not many doctors are trained to use it
- It is expensive
- The effects may not last so the therapy may need to be repeated
- It may not be curative by itself
Reviewed By
Warren Brenner, MD, Oncologist, Lynn Cancer Institute, Boca Raton, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
American Cancer Society website. Laser therapy. www.cancer.org/cancer/managing-cancer/treatment-types/lasers-in-cancer-treatment.html. Updated April 4, 2025. Accessed December 15, 2025.
Doroshow JH. Approach to the patient with cancer. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 164.
Garrett CG, Reinisch L, Fletcher KC Jr. Laser surgery: basic principles and safety considerations. In: Francis HW, Haughey BH, Hillel AT, et al, eds. Cummings Otolaryngology: Head and Neck Surgery. 8th ed. Philadelphia, PA: Elsevier; 2026:chap 58.
National Cancer Institute website. Lasers to treat cancer. www.cancer.gov/about-cancer/treatment/types/surgery/lasers. Updated June 16, 2021. Accessed December 15, 2025.
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