My friend is 25 and has cancer. She doesn't have any health insurance. Are there programs that can help get her medical attention.

Absolutely!

I work in a cancer clinic and we employ someone who helps people like your friend find assistance. Your friends doctor will likely have billing staff that can also put him/her in touch with local help.

If you're in the USA, there are local government offices that can help you (Medicaid)Financial Assistance and Other Resources - National Cancer Institute (http://www.cancer.gov/cancertopics/factsheet/support/financial-assistance)
Have your friend get in touch with the national cancer institute or the american cancer society.. they often offer financial aid to those in need.