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SCOUTs were prevalent in both proximal and distal tube and significantly associated with serous carcinoma versus the others (p cancer, expands the topography of altered PAX2 expression in the female genital tract mucosa and highlights another potential pathway disturbance involved in early serous carcinogenesis in the Fallopian tube. Copyright ? 2010 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. ""Undifferentiated pleomorphic sarcoma (UPS) is one of the most common soft tissue malignancies. Patients with large, high-grade sarcomas often develop fatal lung metastases. Understanding the mechanisms underlying sarcoma metastasis is needed to improve treatment of these patients. Micro-RNAs (miRNAs) are a class of small RNAs that post-transcriptionally regulate gene expression. Global alterations in miRNAs are frequently observed in a number of disease states including cancer. The signalling pathways that regulate miRNA biogenesis are beginning to emerge. To test the relevance of specific oncogenic mutations in miRNA biogenesis in sarcoma, we used primary soft tissue sarcomas expressing either BrafV600E or KrasG12D. We found that BrafV600E mutant tumours, which have increased MAPK signalling, have higher levels of mature miRNAs and enhanced miRNA processing. To investigate the relevance of oncogene-dependent alterations in miRNA biogenesis, we introduced conditional mutations in Dicer and showed that Dicer haploinsufficiency promotes the development of distant metastases in an oncogene-dependent manner. These results demonstrate that a specific oncogenic mutation can cooperate with mutation in Dicer to promote tumour progression in vivo.Copyright ? 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. ""Cancers may be composed of multiple populations of submodal clones sharing the same initiating genetic lesions, followed by the acquisition of divergent genetic hits. Intra-tumour genetic heterogeneity has profound implications for cancer clinical management.