What is the difference between a PET, CT and MRI?  What are tumor markers?  Will eating sugar cause cancer cells to multiply and spread?  Why is patient’s mouth so dry during treatment?  Can surgery cause cancer cells to spread?  Radiation Oncologist Dr. Perez-Tamayo answers some of the most common questions asked, as well as discusses some misconceptions about cancer treatments and outcomes in the first of a two-part series on Cancer Explained with Central Care Cancer Center.