Ascites from pancreatic cancer

My husband ( stage 4, mets to liver) developed bloody ascites just one week before he passed away. He was treated with fulfirinox, then gemcitabine and since going for third line had entered a Ph1/2 immunotherapy study the week prior to his passing. While hospitalized they tapped him 3 times ( MWF) before he passed on Sun. Does anyone have knowledge of immunotherapy treatment and bloody ascites?
Thank you you any feedback.