Are cancer and tumour same?

People often cancer and tumour confuse sth with sth else, think cancer is tumour, tumour is cancer. Tell strictly, cancer and tumour are different, cancer is a kind of malignant tumor, and the floorboard that tumour is benign tumor and malignant tumor.

Benign tumor grows commonly slow, some to certain period growth that can stop to grow, be like melanin tumour (namely black mole) , have clear dividing line, coating is complete, do not diffuse outwards, just be brought up expansily, won't affect the person's life mostly, after the operation is excised, won't have a relapse commonly. But a few benign tumor transforms gradually below certain condition for malignant tumor, answer so cure of as soon as possible. Malignant tumor, namely cancer. It grows rapid, encroach all round organization, without apparent end, quality of a material is solid, without coating, not as clear as normal tissue dividing line, be brought up besides bulk outside, the cell is returned can to all round spread, diffuse, have powerful ruinous. Terminal often secure Yu Mou to organize an organ, appear necrotic, ulcer and haemorrhage, and hard hemostatic with heal. Operation hind has a relapse more easily not only and the cell still can spread to body other place along small lymphatic and blood-vessel. The influence to airframe besides block, oppressive, still can have other harm, cause death even.