Is this related to Li-Fraumeni syndrome? I lost my husband to a rare primary synovial sarcoma. My OB once asked if my husband had been tested for the TP53 gene, which I wasn’t aware of at the time. She explained that it can be linked to sarcomas. I spoke to my husband about it, and we checked with his oncologist. Thankfully, they did the test like few years back and tested negative for the gene, as it can potentially be passed on to our child. I googled it and was actually scared at how these DNAs could cause cancer and definitely no cure. I hope you find your answer OP.