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{{B}}What Is
Cancer?{{/B}} Cancer is actually a group of many related diseases that all have to do with cells. Cells are the very small units that make up all{{U}} (51) {{/U}}things, including the human body. There are billions of cells{{U}} (52) {{/U}}each person's body. Cancer happens when cells that are not normal grow{{U}} (53) {{/U}}spread very fast. Normal body cells grow and divide and know when to stop growing. Over time, they also die.{{U}} (54) {{/U}}these normal cells, cancer cells just continue to grow and divide out of control and don't die. Cancer cells usually group together to form tumors A growing tumor becomes a lump of cancer cells{{U}} (55) {{/U}}can destroy the normal cells around the{{U}} (56) {{/U}}and damage the body's healthy tissues. This can make someone very{{U}} (57) {{/U}}. Sometimes cancer cells break away from the original tumor and travel to other areas of the{{U}} (58) {{/U}}, where they keep growing and can go on to form new tumors. This is how cancer{{U}} (59) {{/U}}. The spread of a tumor to a new place in the body is{{U}} (60) {{/U}}metastasis (转移). People with cancer may feel pretty sick at times--but can usually still do lots of normal things.{{U}} (61) {{/U}}they are very sick, kids and teenagers with cancer may still be able to go to school. They may be tired or bruise (出现青肿) easily, but they {{U}} (62) {{/U}}sometimes go to camp, movies, and sleepover (在外过夜的) parties. People with cancer still like the same things they did{{U}} (63) {{/U}}they got sick. Cancer in kids is rare--but today, many kids who do get cancer go on living normal lives. The number of kids who beat cancer goes{{U}} (64) {{/U}}every year because of new cancer treatments. So a lot of kids with cancer will some day drive cars, go to college, have careers, and even get{{U}} (65) {{/U}}and have families of their own. |