When pre-operatively treating high grade soft-tissue sarcomas involving the chest, abdomen, or pelvis what margins do you use for CTV and PTV?

Most guidelines discuss target delineation and contouring recommendations for extremity sarcomas, which generally suggest larger longitudinal than radial margins and CTVs confined to the compartment. These recommendations seem irrelevant to a sarcoma of the trunk, where a uniform CTV expansion might make more sense.