This is a very good example.
First, the author went to find Henrietta’s family. She discussed Henrietta’s life with her family and got information from them. Then she organized the things happened to Henrietta Lacks. Finally, she started to use those researches to write a book about Henrietta and her immortal cells.
Cancer comes from a unique cell and then spread fast in part of the body.
I would change this sentence with the following
Cancer is the uncontrolled growth of abnormal cells in the body.
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