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Cancer is one of the diseases that is difficult to combat today due to its heterogeneity and unique characteristics such as resistance to chemotherapy. However, the search for friendlier agents for this disease is constant worldwide. Mexico in that sense is not far behind in the development and research of chemotherapeutic agents to treat cancer, Mexican researchers have developed chemotherapeutic agents, named as Cassiopeins. They are coordination compounds based on copper metal ions. Taking into account that copper is one of the important elements present in living organisms, it is part of various proteins such as tyrosinase and ceruloplasmin that need this element as a cofactor, it intervenes in essential processes in life such as cellular respiration. An alternative to treat cancer is to use those same elements that organisms have gained through evolution to generate agents that combat one of the diseases that is not exclusive to human beings, but that leaves many victims worldwide. In addition, an increase in incidence is being seen, not only in the adult population, but now in the general population.