Welcome to the forum, I am sorry that you have needed to find us here. Yes, Sarcoma is really rare, I've just been Googling it for you (It's usually best to get somebody else to do your Googling for you). I found some good information on a site called webmd but when I tried linking it this site blocked me as spam!
I hope this helps even if I can't be as helpful as I tried :-(
How are you doing I’m post op of 6 weeks and had R Hysterectomy and HG ESSarcoma removed stage 2b
Currently waiting for infected site to heal then Radiation external and internal -what follow up treatment have you had -hopes all well for you and life’s back so some kind of normality