Hi EvsGirl, my name is Peg and I was diagnosed with leiomyosarcoma 2 months ago. It is similar to your husbands cancer as it too is a sarcoma only mine was located in my uterus. My understanding is that this type of sarcoma is mainly a smooth muscle cancer which means that it can effect any hollow organ like your stomach, heart, lungs, uterus or extremities. The usual treatment is to surgically remove the tumor, it is usually spread through the blood stream, not lymph nodes.There is no real test for it, other than finding a tumor, usually by following patients symptoms.It does not seem to have a hereditory part but I would still have family members evaluated with any symptoms. Most often chemo and or radiation is used to slow the growth if not able to be fully removed. also CT scans should be done to check for any other tumors to see if it has metastasized, or spread any where else. I hope this info helps, my heart and prayers go out to you and your husband. please keep in touch and let me know how things are going. Peg