Anaplastic thyroid carcinoma (ATC) is a very aggressive thyroid cancer. forkhead box protein M1 (FOXM1) is a member of the forkhead box family of transcription factors involved in control of cell proliferation, chromosomal stability, angiogenesis, and invasion. Here, we show that FOXM1 is significantly increased in ATCs compared with normal thyroid, well-differentiated thyroid carcinomas (papillary and/or follicular), and poorly differentiated thyroid carcinomas (P=0.000002). Upregulation of FOXM1 levels in ATC cells was mechanistically linked to loss-of-function of p53 and to the hyperactivation of the phosphatidylinositol-3-kinase/AKT/FOXO3a pathway. Knockdown of FOXM1 by RNA interference inhibited cell proliferation by arresting cells in G2/M and reduced cell invasion and motility. This phenotype was associated with decreased expression of FOXM1 target genes, like cyclin B1 (CCNB1), polo-like kinase 1 (PLK1), Aurora B (AURKB), S-phase kinase-associated protein 2 (SKP2), and plasminogen activator, urokinase: uPA (PLAU). Pharmacological inhibition of FOXM1 in an orthotopic mouse model of ATC reduced tumor burden and metastasization. All together, these findings suggest that FOXM1 represents an important player in thyroid cancer progression to the anaplastic phenotype and a potential therapeutic target for this fatal cancer.

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Es frecuente que los cánceres de mama presenten áreas de diferenciación celular en anillo de sello. Además, este subtipo celular puede estar presente en las metástasis y no aparecer en el tumor primario. • Material y métodos: Presentamos dos pacientes tratadas por cáncer de mama que desarrollaron tumores con células en anillo de sello, gástrico y endocervical respectivamente, que fueron considerados inicialmente como segundos tumores primarios. • Resultados: En ambos casos, el estudio inmunohistoquímico encontró receptores hormonales en las células en anillo de sello, lo que orientó al diagnóstico de metástasis de cáncer de mama. • Conclusiones: El cáncer de mama puede desarrollar metástasis con células en anillo de sello. La presencia de receptores hormonales en estas células tiene una especificad cercana al 100% en el diagnóstico diferencial entre metástasis de cáncer de mama y tumor de origen digestivo. Palabras clave: Carcinoma de mama. Células en anillo de sello. Receptores hormonales.

Spermatic Cord Liposarcoma are uncommon soft tissue neoplasm. Association with others tumors is so exceptional. We describe and relation between liposarcoma and prostate cancer in a 66 years old patient who had a left paratesticular tumor with low speed growth and 12 cm of length; nodule in prostate gland was detected. Ecography demostrate an hipoecoic tumor in the spermatic cord; Prostate Specific Antigen (PSA) was 1276 ng./ml. and bone gammagraphy reported metastatic lesions. We made an radical orquiectomy and pathological diagnosis including inmunohistoquimical process was sclerosing dedifferenciated liposarcoma. We discuss clinical and pathologic behaviour of this lesions and diagnosis and treatment options.

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