Cancer
• Revised discussion with emphasis on multiple genetic changes leading to abnormal, unregulated cell proliferation
• Expanded coverage and summarizing figure of signaling components that are mutated in various types of cancer
• Use of DNA microarrays to detect subtle differences in different types of cancer cells
• Clearer explanation of inherited versus noninherited forms of cancer
• Development of Gleevec, a new anticancer drug, and why it works
• Updated description of role of p53 in G1 checkpoint and effects of its loss Addition of coverage on DNA
damage and repair
• Association of cancer development with some normal DNA-repair systems and defects in other repair systems