Had brachytheraphy (radioactive seed impants), no chemo, no external radiation, no cutting. Outpatient surgery. Three days after the procedure, drove 1,000 miles in 2 days. Off the bike for a full three weeks (tried it after 1 and then 2 weeks, but no go . . . even put a wadded up wool sock in shorts . . . Ouch!) then back to normal riding. No other saddle needed.
Lots of options out there! Back to riding 100+ miles a week.