Nanoknife for pancreatic cancer

Hi,
My husband was diagnosed with pancreatic adenocarcinoma 7 months ago. It is inoperable because it is wrapped tightly around superior mesenteric artery. He has done 12 cycles of chemo (oxaliplatin, irinotecan and floururacil) but tumor has not shrunk but it hasn't spread/grew either. We were told that continuing chemo after this many sessions is not good for his bone marrow and another chemo regimen is unlikely to going to help if 5FU didn't. We are given an option to go through Nanoknife procedure to "freeze" the tumor. The surgeon said he has done 200 procedures in the last 7 years and there are still some patients who haven't had any additional growth. Does anyone have experience with nanoknife? How was it? Any concerns? Just trying to get more information on this procedure as we were told to make a decision as soon as possible as the tumor hasn't spread to other organs yet and he will no longer be a candidate if it presents spread.