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Background: Heparin and heparin-like molecules have shown some promise in the treatment of several cancers. These molecules have roles in angiogenesis, cell proliferation, immune system modulation, cell migration, and cellular invasion. The pathways and mechanisms used by these molecules to inhibit the proliferation of cancer cells aid in understanding the utilization of these molecules in potential treatments. Our aim is to review the use of heparin and heparin-like molecules in cancer treatment, explore the results, and discuss their potential downfalls., Methods: Publications on heparin and heparin-like molecules and compounds were collected from the PubMed and EMBASE databases. Boolean operators and MeSH terms related to heparin, heparin-like molecules, and cancer were used to conduct this search. The articles were reviewed by the authors., Results: Several heparin mimetics are showing promise in cancer treatment. Various studies using mimetics alone or in combination with chemotherapy have been conducted and have yielded mixed results. They work on multiple target molecules, mostly receptors such as fibroblast growth factor and endothelial growth factor. The main types of cancers targeted by these drugs are multiple myeloma, pancreatic cancer, hepatocellular carcinoma (HCC), and other solid tumors., Conclusion: Although limited clinical evidence of efficacy and potential pitfalls are present, heparin and heparin-like molecules have shown potential in the management of cancer patients. Additional research is required to fully understand the biological mechanisms utilized by these molecules in cancer treatment., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 The Author(s). Published by Elsevier Ltd.. All rights reserved.)