Role of malignant ascites on human mesothelial cells and their gene expression profiles.

BACKGROUND: Malignant ascites is often present at diagnostic in women with advanced ovarian cancer (OC) and its presence is associated with a worse outcome. Human peritoneal mesothelial cells (HPMCs) are key components of malignant ascites. Although the interplay between HPMCs and OC cells is believed to be critical for tumor progression, it has not been well characterized. The purpose of this study was to assess the effect of ascites on HPMCs and clarify the role of HPMCs in OC progression. METHODS: Human OC ascites and benign peritoneal fluids were assessed for their ability to stimulate HPMC proliferation. Conditioned medium from ascites- and benign fluid-stimulated HPMCs were compared for their ability to attenuate apoptosis induced by TNF-related apoptosis-inducing ligand (TRAIL). We conducted a comparative analysis of global expression changes in ascites-stimulated HPMCs using Agilent oligonucleotide microarrays. RESULTS: As compared to benign peritoneal fluids, malignant ascites stimulated the proliferation of HPMCs. TRAIL-induced apoptosis was attenuated in OC cells exposed to conditioned medium from ascites-stimulated HPMCs as compared to OC cells exposed to conditioned medium from benign fluid-stimulated HPMCs. A total of 649 genes were differentially expressed in ascites-stimulated HPMCs. Based on a ratio of more than 1.5-fold and a P < 0.05, 484 genes were up-regulated and 165 genes were down-regulated in ascites-exposed HPMCs. Stimulation of HPMCs with OC ascites resulted in differential expression of genes mainly associated with the regulation of cell growth and proliferation, cell death, cell cycle and cell assembly and organization, compared to benign peritoneal fluids. Top networks up-regulated by OC ascites included Akt and NF-κB survival pathways whereas vascular endothelial growth factor (VEGF) pathway was down-regulated. CONCLUSIONS: The results of this study not only provide evidence supporting the importance of the interplay between cancer cells and HPMCs but also define the role that the tumor environment plays in these interactions.

Osteomalacia provocada por un tumor hiperfosfatúrico / Osteomalacia produced by a hyperphosphaturic tumor

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Metastasis de mesotelioma como causa de tumor retrorrectal / Malignant mesothelioma metastasis as a retrorectal tumor

Comunicamos el caso de un paciente masculino de 58 años, con antecedente de mesotelioma maligno en tratamiento oncológico, quien presentó un tumor en el espacio retrorrectal el cual fue operado, constatándose posteriormente metástasis de mesotelioma. Debido a la infrecuencia del caso se realiza una revisión de la literatura médica nacional e internacional actualizada sobre el tema.

We report a case of a 58 year old male patient, wilh a malignant mesothelioma, with oncological treatment, who presented a tumor in the space retrorectal which was operated. Afterwards it was found out as a metastasis of that lesion. Duc to the infrequency of the case, a revision of the latest national and international medical literature was done.

Metastasis de mesotelioma como causa de tumor retrorrectal / Malignant mesothelioma metastasis as a retrorectal tumor

Comunicamos el caso de un paciente masculino de 58 años, con antecedente de mesotelioma maligno en tratamiento oncológico, quien presentó un tumor en el espacio retrorrectal el cual fue operado, constatándose posteriormente metástasis de mesotelioma. Debido a la infrecuencia del caso se realiza una revisión de la literatura médica nacional e internacional actualizada sobre el tema.(AU)

We report a case of a 58 year old male patient, wilh a malignant mesothelioma, with oncological treatment, who presented a tumor in the space retrorectal which was operated. Afterwards it was found out as a metastasis of that lesion. Duc to the infrequency of the case, a revision of the latest national and international medical literature was done.(AU)

Leiomioma de la cápsula renal: presentación de un caso y revisión de la literatura / Leyomioma of the renal capsule: a case report and literature review

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Leiomioma vesical. A propósito de dos casos y revisión de la literatura / Bladder leiomyoma. Report of two new cases and bibliographic review

Objetivo: Los tumores mesoteliales primarios de la vejiga son entidades raras, y de entre ellos el más frecuente es el leiomioma vesical, que puede crecer sin apenas manifestaciones clínicas o muy inespecíficas. Métodos: Presentamos el caso de un leiomioma vesical en dos pacientes y la revisión de la literatura. Resultados: El tratamiento fue mediante una resección transuretral, la evolución excelente y el seguimiento en consultas externas tras más de 5 años sin incidencias. Conclusiones: El abordaje quirúrgico sigue siendo la mejor solución, de fácil ejecución y con un porcentaje escaso de complicaciones. El pronóstico es bueno en cualquier caso y las recidivas son anecdóticas (AU)

Objective: Primary mesothelial tumors of the bladder are rare entities, being leiomyoma the most frequent of them. It may grow without any clinical symptoms or with very unspecific ones. Methods: We report two cases of bladder leiomyoma in 2 patients, and performed a bibliographic review. Results: They were treated by transurethral resection, with an excellent outcome, without incidences over five years of follow-up. Conclusions: Surgical treatment continues to be the best solution; it is easy to perform and has a very limited number of complications. Prognosis is good in any case and progression is anecdotic (AU)