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Dishop M.K.,Childrens Hospital | McKay E.M.,Children's Hospital of Philadelphia | Kreiger P.A.,Children's Hospital of Philadelphia | Priest J.R.,International Pleuropulmonary Blastoma Registry | And 7 more authors.
American Journal of Surgical Pathology | Year: 2010

The differential diagnosis of congenital lung lesions includes a variety of pulmonary malformations, and uncommon or rare neoplasms such as the pleuropulmonary blastoma (PPB) and congenital peribronchial myofibroblastic tumor (CPMT). Although most of the congenital lesions have a predominantly cystic appearance, the exceptions of a more solid process are the type 3 congenital cystic adenomatoid or pulmonary airway malformation (CCAM-CPAM) and the CPMT. The clinical and pathologic features of a unique solid or mixed solid/cystic lung mass composed of immature interstitial mesenchyme in association with irregular airspace-like structures mimicking abnormal incompletely developed lung are presented in this report of 10 infants (7 males, 3 females) whose tumor-like lesions were detected in the prenatal period to 3 months of age (median, 1-day old). A lobectomy was done in all 10 infants and 1 infant received adjuvant chemotherapy. One of the surgical resections occurred as an ex utero, antenatal procedure because of fetal ascites. There have been no reported recurrences in those patients with greater than 12 months of follow-up ranging from 15 to 182 months (9 cases). Because of the morphologic resemblance of this mass-like lesion to fetal lung at 20 to 24 weeks gestation (as though any further pulmonary development was arrested in these localized lesions), we are proposing the designation of fetal lung interstitial tumor (FLIT) whose pathogenetic relationship, if any, to type 1 (cystic) pleuropulmonary blastoma remains uncertain to date. © 2010 by Lippincott Williams & Wilkins.

Bahubeshi A.,McGill University | Bahubeshi A.,Jewish General Hospital | Bal N.,Baskent University | Frio T.R.,McGill University | And 12 more authors.
Journal of Medical Genetics | Year: 2010

Background: Multilocular cystic nephroma (CN) is a benign kidney tumour and is part of a family of kidney neoplasms including cystic partially differentiated nephroblastoma and Wilms tumour (WT). CN is rarely familial or bilateral, but it occurs in about 10% of families where pleuropulmonary blastoma (PPB) is present. Recently, germline mutations in DICER1 were found in familial PPB. Objective: To search for DICER1 mutations in two families with familial CN; PPB was present in one family. Additionally, to test germline DNA from 50 children with sporadic WT for DICER1 mutations. Results: Both families with multiple CN were found to have mutations in DICER1 leading to premature stop codons, predicted to result in loss of the ribonuclease and dsRNA binding domains. These domains are essential to the function of DICER1. No germline mutations were found in any of the 50 children who had developed WT. Conclusion: It has been established that DICER1 mutations cause familial CN and may be implicated in bilateral CN. No germline mutations were found in the patients with WT, suggesting that DICER1 mutations are unlikely to have a major role in the aetiology of sporadic WT. These results provide further evidence implicating miRNA dysregulation in tumourigenesis.

Doros L.,Childrens National Medical Center | Yang J.,Childrens National Medical Center | Dehner L.,University of Washington | Rossi C.T.,Childrens National Medical Center | And 10 more authors.
Pediatric Blood and Cancer | Year: 2012

Embryonal rhabdomyosarcoma (ERMS) is the most common childhood sarcoma and is a component of the familial pleuropulmonary blastoma (PPB)-predisposition syndrome. Using the PPB model, we hypothesized that DICER1 mutations would be found in familial and sporadic forms of ERMS. Blood samples from four children with familial PPB and ERMS, and 52 sporadic ERMS tumors were tested for DICER1 mutations. Germline DICER1 mutations were found in all four patients with familial PPB and 2 of 52 (3.8%) sporadic ERMS had somatic mutations. Our findings confirm the pathogenetic relationship between ERMS and PPB suggesting that ERMS may result from abnormal miRNA regulation. © 2011 Wiley Periodicals, Inc.

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