Cancer causes millions of deaths worldwide each year. Chemotherapy, the treatment of choice in metastatic cancers, presents serious toxicity problems compromising patients' quality of life and limiting the dose that can be administered and, therefore, its therapeutic efficacy. Besides, chemotherapies usually present short half-lives. Nanomedicine is a promising tool to solve these problems: the encapsulation of chemotherapeutic drugs in nanocarriers allow to protect and to selectively deliver them to cancer cells, thus increasing drug efficacy while avoiding side effects. However, avoiding premature drug release from nanocarriers is a challenge. In this thesis, two novel encapsulation concepts have been developed for breast cancer treatment: Mesoporous Organosilica Drug nanoparticles (MODs) and Drug Structure-Directing Agents (DSDAs). These multimodal nanomedicines allow to significantly reduce drug leakage, and in vivo experiments showed a higher therapeutic efficacy and better safety profile than conventional treatment.
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