Kate Middleton is undergoing 'preventive chemotherapy.' What is that? - USA TODAY

Kate Middleton is undergoing 'preventive chemotherapy.' What is that?  USA TODAYKate Middleton's parents 'desperately upset' over cancer diagnosis as they step in to help grandchildren  Yahoo EntertainmentPrince William and Kate Middeleton Release First Joint Statement Since Cancer Announcement  Vanity FairHarry and Meghan Learned Kate's Cancer Diagnosis on TV  TIME