Fear pancreatic cancer oncologist may discontinue care

My relative has had radiation and multiple standard chemo treatments. We are interested in exploring clinical trials. There are dozens offered currently at the facility where my relative is getting care. We are afraid if we ask again about this possibility, the oncologist will drop my relative as a patient using any of the following grounds: transfer of care; no effective treatment options; or non-compliance. The oncologist gives very limited analysis/interpretation of results and is vague about future treatment plans. However, the hospital is one where my relative needs to get care because of its resources, proximity to home, and insurance. Could others shed light on what circumstances allow an oncologist to drop a patient and if it is likely another oncologist at the same hospital could accept my relative as a patient? Thank you