Dr. Truty at Mayo Clinic was a pioneer in this approach of chemo before surgery in tumors that were in former times considered in operable. You can read more about Dr. Truty and this treatment approach in various articles. Here's the most comprehensive one written for medical professional:
- 3 factors associated with improved outcomes for individuals with pancreatic ductal adenocarcinoma https://www.mayoclinic.org/medical-professionals/digestive-diseases/news/3-factors-associated-with-improved-outcomes-for-individuals-with-pancreatic-ductal-adenocarcinoma/mac-20463202

He explains in layman's terms in this video

I recommend contacting Mayo Clinic right away. They may suggest coming to Mayo or to work with your local hospital for chemo and then to come to Mayo Clinic for surgery. You have options. Here are the contact numbers for all 3 Mayo Clinic locations. http://mayocl.in/1mtmR63

I'm sure other members like @cindysavant @susan2018 @marvinjsturing @mayojoe7 @kjrita @buckslayer @chemobile @colorafo19 will have some first hand experiences to share with you.