Understanding Your Treatment Options
PHOTO DYNAMIC TREATMENT (PDT)
PDT is a new generation tumor treatment approved by the FDA and
other European medical authorities. It is also called
photosensitization therapy or photochemical therapy. This is the
only photomotor therapy system that is authenticated by the FDA of
the USA and several other national authorities. It has been
successfully used in the clinic and found to have very significant
therapeutic effects.

Principle of treatment

PDT uses an agent which is a photosensitizer and this is given to
the patient orally or intravenously. After circulating in the blood to
the whole body, it selectively accumulates in cancer tissue. A
photodynamic equipment is then used to emit a laser beam at a
long wavelength of 630nm targeting the tumor tissue. The
photosensitizer concentrated in the cancer cells are then activated
as a result and releases a highly energized, free radical form of
oxygen known as singlet oxygen. The singlet oxygen destroys the
cancer cells from the inside while leaving normal tissues largely
unaffected.

Benefits of the treatment

In comparison with conventional treatments such as radiotherapy,
chemotherapy and surgery,
PDT is far superior for the following
reasons:

Accurate curative effect: PDT is a targeting therapy through the
use of the photosensitizing agent. The agent is activated by the
long wave laser from the outside and eliminates the cancer cells  
through the release of  free radicals and other substances which
are targeted to the cancer cells. At the same time it helps to
strengthen the body’s immune system resulting in higher resistance
to tumor growth and recurrence. The curative effect of this therapy
is much more obvious in early stage patients.

Minimum trauma caused: Since no surgical operation is involved,
there is no resultant injury or wound.  This treatment uses
fine
optical fibre lens, endoscopy, ultrasonography , CT and other
interventive technologies to generate the laser and lead it to the
cancer for activating the photosensitizer.

Low toxicity
: The sensitizer accumulated in the cancer cells will only
be activated to kill the cancer cells when it is taken at a sufficient
level of concentration and the light used is strong enough at the
lighted area. The normal tissue contains only a very low level of the
sensitizer and has no laser light irradiated on it. Therefore PDT does
no harm to the rest of the body. The immune system, blood
circulation system, organs and tissues within the body are not
affected during PDT. This is totally different from radiotherapy and
chemotherapy which result in serious side effects.

Wide Application and Certain Curative Effect

PDT has almost the same efficacy in treating different types of
cancer. In addition, the sensitizer itself is non-poisonous. PDT can
therefore be used for many types of cancer and can be used
repeatedly with good effects. It is found to be efficacious in curing
most early stage cancers and relapse rate is low.    

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