I Was Diagnosed With Leiomyosarcoma. They Cut My Posterior Chest

I was diagnosed with leiomyosarcoma. they cut my posterior chest wall and took the tumor out. They said that it was a primary spot but didn't know enough about screening to tell me that it is primary or secondary, even after MRI and CAT Scan. I lived in Seoul Korea in 1991-1992. I often visited friends in Camp Carrol and up near the DMZ due to being exhausted and getting sleep there. I dove along the East Coast of South Korea. There was alot of Agent Orange Storage in both the areas I occupied with subsequent use of the water and national intake of food. What are the stats regarding this type of sarcoma and Agent Orange Connection?