What types of etiological factors can cause sarcomas? Name some. (This question is a basic/general knowledge question. There are 5 categories. Either name some categories, OR actual causes. Don't over think it.)

1) Environmental Factors: Scar tissues, Chemical carcinogens (asbestos, etc. Products labeled "may cause cancer".) 2) Iatrogenic Factors: caused by physician intervention (like medications, surgeries) 3) Viruses: HIV 4) Immunologic Factors: immunodeficiencies, therapeutic immunosuppression 5) Genetics: inherited predisposition