الفهرس 
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Abstract
Lung cancer is the most common malignant tumor in men and this may also be the case in women in the coming years. Over 1 million people die from lung cancer each year making it very costly to find effective and efficient methods of therapy. The conventional methods of treating cancer can be either through chemotherapy, radiotherapy, surgical removal or other new modalities. BET offers an alternative biological cancer treatment that makes clinical use of the body’s natural electrical system (biologically closed electric circuits), influencing its mechanisms of ionic conduction and chemical reaction by applying direct current to tissue. In this process, the cancerous cells lose their “camouflage” and the immune system begins its defense against the malignancy. Basically, the defense system of the body is activated. It is performed under local anesthesia at the electrode insertion site. Insertion of electrodes was done under x- ray or CT guidance. The application of direct current to tumor cells makes changes to the membrane potential and permeability and it also causes electrolysis, electrophoresis and electro-osmosis resulting in damaging cell membranes and strengthening of the immune system. A great advantage that it can be used to deliver therapeutic agent into tumor cells to effectively influence their targets. BET is used to treat inoperable tumor and tumor not responding to chemotherapy or radiotherapy with less complication including haemoptysis and traumatic pneumothorax. Conclusion: BET may be a gentle and effective alternative method to the usual cancer therapies. The procedure is painless and taking a short duration of action by comparison to other lines of therapy, ranging between 2-3 hours and inflicts absolutely no harm. It is an inexpensive outpatient procedure that requires no surgery, leaves no scar, risks nothing like the dreadful side effects of chemotherapy and radiation therapy