I have done a course on this from Germany.  It is a 5 mw intravenous laser which works alongside a  dose of chlorophyll, to accelerate laser absorption in malignant tissues.

https://www.createspace.com/5947191

Dear Malini Chaudhri,

Thanks for your answer.

It's interesting work.

Dear Zahra,

Laser therapy uses high-intensity light to treat cancer. Lasers can be used to destroy tumors. Lasers are most commonly used to treat superficial cancers (cancers on the surface of the body or the lining of internal organs).Usually, the treatment of the cancer depend on the the type the cancer and the stage as well as there are a lot to check then we can use for therapy. 

https://www.cancer.org/treatment/treatments-and-side-effects/treatment-types/lasers-in-cancer-treatment.html

Dear Prof. A Timimi Zahra,

Thanks For Your Suggestions, your articles were interesting.

I want to know about the using of LASER to treat internal organs, such as the esophagus, and colon etc...

So, can you tell me what are the parameters I need to know before I choose the best laser treatment?

It's my pleasure to get more information about this project. 

Zahraa,

Regards.

Dear Dr. Murtadha Sh. Aswood,

Thanks for this useful recommendation, your answer is very interesting.

But, If the LASER  used to treat the cancers on the surface of the body, what are the benefits and risks of this treatment?

Zahraa,

Regard.

Dr. Rafid A. Abdullah