Pancreatic
cancer is expected to be the most lethal cancer by 2030;
among that, PDAC is the most prominent one, which is immune resistant,
posing substantial hurdles to creating effective therapeutics. Despite
the advancements in immunotherapy, its application in PDAC is less
successful. Uniquely, PDAC tumors are “cold” to immune
response mainly due to suppression of spatiotemporal immune signatures
from cells and tumor microenvironment. Contrary to other immune-responsive
tumors, immunotherapy in combination with chemotherapy in PDAC, is
still diffusion-limiting to the drugs and less cytotoxic to cancer
cells. Moreover, newer approaches exploring nanotechnology are being
tried to make PDAC “hot” and immunogenic in nature and
are promising. This review analyses the design strategies of nanosystems
for effective spatiotemporal signaling to improve immune response
to PDAC tumors. Particularly, that helps to overcome early evasion
in phase I, and resistance to the antitumor immune response by modulating
cellular and tumor microenvironment (TME) through the latest advancements
in nanotechnology, immune mechanisms, and potential delivery routes
for PDAC treatment. Ongoing and completed clinical trials of nanotechnology-driven
immunotherapies in pancreatic cancer are also highlighted here. Overall,
this approach of nanotechnological strategy to enhance immunotherapy
in PDAC holds great promise and may contribute to a groundbreaking
shift in the therapeutic management of PDAC and reduce the mortality
rate of this lethal disease.