4. Patients enrolling onto Arm A (Gemcitabine and nab-Paclitaxel) or Arm B (mFOLFIRINOX) are allowed to have up to two prior lines of systemic therapy, with adjuvant therapy counted as one line of therapy as long as disease recurrence occurred > 6 months of last dose of therapy. Prior systemic therapy in the metastatic setting is allowed for as long as the therapy contained BBI608 in combination with either Gemcitabine and nab-Paclitaxel or mFOLFIRINOX. Toxicities related to prior therapy must have completely resolved (except for alopecia and anemia), or be deemed irreversible.