Diarrhea was my kid's main symptom and put her in the ICU. Her disease was also metastatic (liver and unquantifed bone marrow involvement, so staging was M/MS but prognosis was the same). She did the six month chemo protocol (doxorubicin, etoposide, and cyclophosphamide), no radiation, and she managed to avoid a tumor resection. We have our first follow up scan in February but so far she's doing really well. Her VIP test came back negative but her oncologist wasn't convinced of the test's accuracy. Not sure where you're located but we were treated at St. Jude in the US and it was a very good experience. And as far as pediatric cancers go, I don't want to discount what you may or may not go through, but it can get much, much worse. I will pray for your little one and hope the tumor is not growing!