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A British doctor is pioneering breaking treatment for the breast cancer which uses light to tartget and kill tumours without the need for surgery. Cancer surgeon Mo Kshtgar is adapting a form of light therapy for skin cancer to be used in breast cancer. The treatment is known as photodynamic therapy (PDT). It uses tumour killing drugs which are injected into the body, latch on to the tumour and then are activated from outside using a laser, reports The Telegraph. Its plus point is that it does not involve surgery and leaves healthy cells around the tumours unaffected. Trials will be conducted at London's Royal Free Hospital.