21.   Galarraga will undergo five months of chemotherapy to kill the cancerous cells, followed by one month of radiation.

22.   He says there is a substance in shark cartilage that inhibits development of blood vessels that feed cancerous cells, a process called angiogenesis.

23.   In contrast, Herceptin targets only cancerous cells.

24.   In cancerous cells, for reasons still not known, telomerase becomes activated, and the telomeres begin growing again.

25.   In the past, scientists could not kill cancerous cells without harming healthy ones, limiting the use of microwaves to skin tumors.

26.   In this type, cancerous cells are sensitive to female hormones.

27.   It acts like a guided missile, killing only cancerous cells while generally sparing healthy ones.

28.   It is known that normal cells run on a different timetable than cancerous cells.

29.   It works by using toxins, drugs coupled with monoclonal antibodies, that promise to destroy cancerous cells in tumors without adversely affecting nearby healthy cells.

30.   Molecular targeting gets its name from the use of experimental drugs that strike selectively at specific areas in cancerous cells to disrupt their functions.