For the situation of:
<b>ISOLATED PRIMARY, SURGICALLY RESECTED WITH CLEAR MARGINS.</b>

Sounds like it was completely removed at this time... so there isn't any left, is there?  So you may be a 'cancer patient' but you may not have cancer!!!!

Any treatment done at this time is called&nbsp;"Adjuvant therapy" or&nbsp;"assisting treatment". The first treatment, the surgery, removed all visible trace of cancer from your  body. The&nbsp;"assisting" or "adjuvant" treatment of chemotherapy or radiation therapy is meant to help remove even microscopic traces.   However, for LMS, in some situations, this adjuvant treatment does not give any proven benefit.                                                        

Many sarcoma oncologists would recommend waiting until there was something to treat.

Your body can only take so many treatments of radiation and/or chemotherapy.  If you use up part of this allowance, for no proven benefit, you may not be able to have treatment should you have large tumors that need it, later on.

Some sarcomas do respond to adjuvant therapy.  However, often in certain locations, LMS does not respond to either radiation or chemotherapy as adjuvant therapy.

It is wise to discuss this thoroughly with your sarcoma oncologist.  

At this point, people are usually desperate to do something that will kill all possible LMS, whether it is there, or not.   They will undergo chemotherapy, they will undergo radiation.  However, sometimes this chemotherapy or radiation will have no proven benefit.      

Do not let your desperation to be free of cancer cause you unnecessary physical damage. Damage for no proven benefit.  

Neither radiation nor chemotherapy are benign treatments. They cause damage to your body.  Some of this damage is permanent.  Some of this damage may even be fatal.

This is a decision that requires careful thought, and reading of the research literature.  And further discussion with your oncologist.

Do not act hastily.  Think. Discuss. Read.