Photodynamic Therapy Services
Photodynamic therapy, also called PDT, is a cancer treatment that uses light energy to kill cancer cells. First, the doctor administers a photosensitizer, a type of drug that makes cells sensitive to certain wavelengths of light. Then the cancer cells are exposed to light, causing a reaction that kills cancer cells nearby. In clinical trials, researchers found that this treatment can improve life expectancy in pleural mesothelioma patients, especially when used in combination with other treatments such as surgery.
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The main photosensitizer used for pleural mesothel...
The main photosensitizer used for pleural mesothelioma treatment is porfimer sodium, usually called Photofrin. The Food and Drug Administration (FDA) approved this drug for use in other cancers, such as esophageal cancer, and recognized its potential in treating mesothelioma. Because Photofrin may help treat the rare cancer, the FDA designated it an orphan drug, which helps speed along the FDA approval process.
How Does it Work?
Photodynamic therapy is usually an outpatient procedure and does not require a hospital stay. It may be used in conjunction with other treatments like chemotherapy and surgery to fight the cancer in multiple ways.
The treatment begins with the administration of a photosensitizing agent, which is injected into the bloodstream. This drug is absorbed by cells, both healthy and cancerous, but stays in cancerous cells longer. After one to three days, the photosensitizer has left most healthy cells but remains in mesothelioma cells. This is when light is administered, usually via laser, to activate the photosensitizer. Doctors may insert fiber optic cables into the lungs in order to aim the light at the tumor and directly hit cancer cells, a process that may take up to an hour.
This light must be at a specific wavelength and color in order to trigger a reaction within the drug. Photofrin, for example, reacts to red light. Once the drug is activated, it produces a highly reactive form of oxygen. The oxygen affects all nearby cancer cells, prompting them to die. It may also damage the tumor's blood vessels, thus cutting off the nutrient supply and killing cancer cells.
Which Patients are Eligible?
Photodynamic therapy can only be used on areas of the body that light can reach, such as just below the skin or along the lining of internal organs. Because of this, the therapy is most effective in treating localized cancer that has not spread throughout the body. In addition, individuals with large tumors may not be suitable candidates for this therapy, as the light is unable to penetrate the entire tumor.
What are the Side Effects?
This treatment causes skin and eye sensitivity to light for about six weeks. Doctors advise patients to avoid sunlight and other bright light during this time. PDT may cause swelling, burning, pain or scarring in healthy tissues. Patients may also experience coughing, trouble swallowing, stomach pain, painful breathing or shortness of breath.
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