To Assess the Safety of Continuous IV Administration of Plerixafor and Assess Impact on the Immune Microenvironment in Patients With Pancreatic, Ovarian and Colorectal Adenocarcinomas

This is a prospective, non-randomised, open label, Phase I, dose escalation trial of plerixafor in patients with histological documentation of advanced pancreatic, high grade serous ovarian or colorectal adenocarcinoma. We will investigate the feasibility of administering plerixafor in terms of safety, and will try to identify the proof of mechanism in patients. This trial will follow the standard 3+3, Phase I trial design, leading to a treatment expansion phase to confirm the RP2D.