Part 1 of Essay
A tumour is a mass of new tissue growth that does not react to normal controls or the organizing influence of other tissues, and it has no useful function in the body. This applies to both types of , malignant and benign. Malignant, also known as, cancerous , are additionally defined by their invasion of local tissue and ....

Part 2 of Essay
.... (unless treated) because of its invasive and metastatic characteristics. The tumour grows locally by spreading into surrounding tissues. Solid tumours, which develop in the breast, colon, lung, and other organs, contain an inner core with high pressure zones that compress and collapse blood vessels, often preventing the penetration of blood-borne cancer treatments. It spreads to distant sites by the breaking off of malignant cells, which move through the blood and lymphatic systems, attach themselves, and begin ....