Published in Biomaterials Science, 2020, 8, 4887 – 4905, Doi: https://doi.org/10.1039/D0BM00390E 1 Electrospun nanofibers in cancer research: from engineering of in vitro 3D cancer models to therapy Marta Cavo, †,1 Francesca Serio, †,1,2 Narendra R. Kale, 3 Eliana D’Amone, 1 Giuseppe Gigli, 2,1 Loretta L. del Mercato* ,1 1 Institute of Nanotechnology, National Research Council (CNR-NANOTEC), c/o Campus Ecotekne, via Monteroni, 73100, Lecce, Italy. 2 Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, via Arnesano, 73100, Lecce, Italy. 3 MIT-WPU, School of Pharmacy, Kothrud, Pune 411038, India. † These authors contributed equally. *corresponding author: [email protected] Abstract Electrospinning is historically related to tissue engineering due to its ability to produce nano- /microscale fibrous materials with mechanical and functional properties that are extremely similar to the extracellular matrix of living tissues. General interest in electrospun fibrous matrices has recently expanded to cancer research both as scaffolds for in vitro cancer modelling and as patches for in vivo therapeutics delivery. In this review, we examine electrospinning by providing a brief description of the process and overview of most materials used in this process, discussing the effect of changing the process parameters on fibers conformation and assemblies. Then, we describe two different applications of electrospinning in service of cancer research: firstly, as three-dimensional (3D) fibrous materials for generating in vitro pre-clinical cancer models; secondly, as patches encapsulating anticancer agents for in vivo delivery.