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Radiation therapy refers to the medical use of targeted energy such as radioactive substances, x-rays etc., to destroy or kill cancerous cells without affecting the nearby healthy tissues. This therapy can be deployed as a sole therapy or as an adjuvant therapy, or it can also be employed to shrink the tumor cells, reduce pain and pressure or any other symptoms of cancer (also known as palliative radiation therapy). Currently, acceptance of radiation therapy is increasing owing to the consistent rise in cancer incidence worldwide. As per the updates published by World Health Organization (WHO), in February 2015, cancer is among the leading causes of mortality and morbidity across the globe with approximately 14 million new cases and around 8.2 million cancer related deaths in 2012.
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