Examinando por Autor "Mainetti, Leandro Ernesto"
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Ítem Acceso Abierto Achievements and challenges in the use of metronomics for the treatment of breast cancer(Elsevier, 2020-03) Scharovsky, O. Graciela; Rico, María José; Mainetti, Leandro Ernesto; Perroud, Herman A; Rozados, Viviana R.Ítem Acceso Abierto Antitumor activity of new chemical compounds in triple negative mammary adenocarcinoma models(Future Science Group, 2020-01-23) Giolito, Maria Virginia; Camacho, Cristian M.; Martinez-Amezaga, Maitena; Traficante, Carla Inés; Giordano, Rocío A.; Cornier, Patricia G.; Mata, Ernesto G.; Delpiccolo, Carina M.L.; Boggián, Dora G.; Del Giúdice, Antonela; Mainetti, Leandro Ernesto; Scharovsky, Olga Graciela; Rozados, Viviana R.; Rico, María JoséÍtem Acceso Abierto Comparative Effectiveness of Two Metronomic Chemotherapy Schedules. Our Experience in the Preclinical Field(Taylor & Francis, 2014-02-05) Rico, María José; Perroud, Herman A; Mainetti, Leandro Ernesto; Rozados, Viviana R.; Scharovsky, O. GracielaÍtem Acceso Abierto Inmunomodulación y antiangiogénesis en la terapéutica oncológica. De la investigación básica a la clínica(Fundación Revista Medicina (Buenos Aires), 2012-02) Scharovsky, O. Graciela; Matar, Pablo; Rozados, Viviana R.; Rico, María José; Zacarías Fluck, Mariano; Mainetti, Leandro Ernesto; Fernández Zenobi, María VirginiaLa investigación básica y pre-clínica en oncología celular y molecular son pilares fundamentales en los que se apoyan la mayoría de los adelantos en la terapéutica del cáncer. Los hallazgos obtenidos y su aplicación en la práctica clínica constituyen la causa del avance sostenido en el tratamiento de la enfermedad neoplásica. El objetivo de este trabajo es resumir y discutir los resultados pre-clínicos en inmunomodulación y anti-angiogénesis para el tratamiento de diversos tipos de tumores, obtenidos en nuestro Instituto durante los últimos 15 años, y la posterior traslación y aplicación del conocimiento experimental en un Ensayo Clínico Fase I/II. Se describen los resultados que contribuyeron a descifrar los mecanismos de acción de la inmunomodulación antimetastásica con ciclofosfamida, la quimioterapia metronómica con diferentes drogas únicas o combinaciones, y finalmente el diseño y resultados preliminares de un ensayo clínico de quimioterapia metronómica para pacientes con cáncer de mama avanzado.Ítem Acceso Abierto Metastatic breast cancer patients treated with low-dose metronomic chemotherapy with cyclophosphamide and celecoxib: clinical outcomes and biomarkers of response(Springer, 2016-02) Perroud, Herman A; Alasino, Carlos María ; Rico, María José; Mainetti, Leandro Ernesto; Queralt, Francisco ; Pezzotto, Stella Maris; Rozados, Viviana R.; Scharovsky, O. GracielaÍtem Acceso Abierto Metronomic chemotherapy: changing the paradigm that more is better(Multimed Inc., 2009-03) Scharovsky, O. Graciela; Mainetti, Leandro Ernesto; Rozados, Viviana R.The introduction of the “maximum tolerated dose” in usual treatment protocols (and its concomitant overt toxicity) made necessary the imposition of rest periods between cycles of therapy—a practice that not only involves re-growth of tumour cells, but also growth of selected clones resistant to the therapy. To avoid the problems caused by traditional chemotherapeutic regimens, a new modality of drug administration called “metronomic chemotherapy” has been proposed. This name makes reference to the chronic, equally spaced administration of (generally) low doses of various chemotherapeutic drugs without extended rest periods. The novelty of this treatment modality lies not only in its antitumour efficacy with very low toxicity, but also in a cell target switch, now aiming at tumour endothelial cells. The knowledge acquired in the experimental field of metronomic chemotherapy, plus the increasing experience that is being obtained in the clinical setting, will help to lead a change in the design of therapeutic protocols against cancer.Ítem Acceso Abierto Regulatory T cells but not NKT I cells are modulated by a single low-dose cyclophosphamide in a B cell lymphoma tumor-model(MORION LLC, 2012-03) Rico, María José; Rozados, Viviana R.; Mainetti, Leandro Ernesto; Zacarías Fluck, Mariano; Matar, Pablo; Scharovsky, O. GracielaAim: Experimental and clinical studies showed that the administration of cyclophosphamide (Cy) in low doses leads to an enhancement of the antitumor immune response. Our objective was to study the modulation, if any, by low dose Cy, of T regulatory (Treg) and natural killer T (NKT) I cells, two cell populations of the innate immune response with opposing effects on the tumors, in a rat B cell lymphoma model. Methods: Inbred e rats were challenged s.c. with L-TACB lymphoma and on day 14 animals were distributed in two groups. Treated: injected i.p. with cyclophosphamide (10mg/kg of body weight) and Control: injected i.p. with saline. Blood samples were taken from days 0 to 21 and the percentage of T regulatory and natural killer T I cells were determined by flow cytometry. Results: We found that the increase of natural and inducible T regulatory cells of peripheral blood achieved during tumor growth was significantly downregulated by cyclophosphamide. On the contrary, natural killer T I cells were not modulated by the treatment. Conclusion: The antimetastatic effect of a single low dose of Cy would be due, at least in part, to downregulation of natural and inducible T regulatory cells.Ítem Acceso Abierto Safety and therapeutic effect of metronomic chemotherapy with cyclophosphamide and celecoxib in advanced breast cancer patients(Future Medicine Ltd, 2013-03-08) Perroud, Herman A; Rico, María José; Alasino, Carlos María; Queralt, Francisco ; Mainetti, Leandro Ernesto; Pezzotto, Stella Maris; Rozados, Viviana R.; Scharovsky, O. GracielaÍtem Acceso Abierto Supplementary Materials - Antitumor activity of new chemical compounds in triple negative mammary adenocarcinoma models(Dataverse Prueba) Giolito, Maria Virginia; Camacho, Cristian M.; Martinez-Amezaga, Maitena; Traficante, Carla Inés; Giordano, Rocío A; Cornier, Patricia G.; Mata, Ernesto G.; Delpiccolo, Carina M.L.; Boggián, Dora G.; Del Giúdice, Antonela; Mainetti, Leandro Ernesto; Scharovsky, Olga Graciela; Rozados, Viviana R.; Rico, María JoséÍtem Acceso Abierto The Immune Response and the Therapeutic Effect of Metronomic Chemotherapy With Cyclophosphamide(Cognizant Communication Corporation, 2010-11-01) Rozados, Viviana R.; Mainetti, Leandro Ernesto; Rico, María José; Zacarías Fluck, Mariano; Matar, Pablo; Scharovsky, O. GracielaMetronomic chemotherapy (MCT) is a novel therapeutic strategy for cancer treatment endowed with an antiangiogenic effect. It refers to regular administration of low doses of cytotoxic drugs, with minimal or no drug-free breaks. Previously, we demonstrated the immunomodulating activity of a single low-dose of cyclophosphamide (Cy) and the antitumor effect of MCT with Cy on established rat lymphomas and sarcomas. Here, we examined whether the immune response is responsible for the antitumor effect of MCT with Cy on L-TACB lymphoma. Inbred e rats and nude mice were subcutaneously challenged with L-TACB. After 7 days, they were distributed into two experimental groups: 1) treated animals, which were injected IP with Cy (10 mg/kg body weight) three times per week, and 2) control animals, which received IP saline injections. Exponential growth and decay and tumor doubling time were calculated. Also, serum IL-10 levels were measured. One hundred percent of treated rats showed tumor regression versus 0% of control rats. The increase of tumor-induced IL-10 levels was reverted by the treatment with Cy. On the other hand, there were no tumor regressions, in treated or control nude mice. However, the tumor doubling times of treated nude mice were significantly higher than those of control mice, implying that other antitumor mechanism(s), independent of the adaptive immune response, might be taking place. Our present results indicate that modulation of the immune response would be involved in the antitumor effect of MCT with Cy, because the absence of the specific immune response impairs, at least in part, its therapeutic effect in a lymphoma tumor model.Ítem Acceso Abierto Therapeutic efficacy of metronomic chemotherapy with cyclophosphamide and doxorubicin on murine mammary adenocarcinomas(Oxford University Press, 2013-09-01) Mainetti, Leandro Ernesto; Rico, María José; Fernández Zenobi, María Virginia; Perroud, Herman A.; Roggero, Eduardo; Rozados, Viviana R.; Scharovsky, O. Graciela