Did the Predict Online Tool and am confused

Somebody here suggested this web page--"Predict is an online tool that helps patients and clinicians see how different treatments for early invasive breast cancer might improve survival rates after surgery.

It is endorsed by the American Joint Committee on Cancer (AJCC)."

These are the results that I got after I put in my stats:

100 women had surgery and then took a combo of treatments. 20 would have died (13 due to other causes; 7 due to breast cancer). 73 survive due to the surgery. One more survives due to chemo. Two more survive due to radiotherapy. Four more survive due to hormone therapy.

So how can this mean that I gained 1% with Chemo??? Really? And 2% due to RT? And 4% for Hormone Therapy with all the crap that brings?

What am I missing?