Benjamin Hoch

Publications (3)4.03 Total impact

• Article: Renal cell carcinoma and a constitutional t(11;22)(q23;q11.2): case report and review of the potential link between the constitutional t(11;22) and cancer.

  Jérôme Doyen, Xavier Carpentier, Juliette Haudebourg, Benjamin Hoch, Houda Karmous-Benailly, Damien Ambrosetti, Thibault Fabas, Jean Amiel, Jean-Claude Lambert, Florence Pedeutour
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  ABSTRACT: We observed a t(11;22)(q23-24;q11.2-12) and monosomy 3 in renal tumor cells from a 72-year-old man. The hypothesis of a primitive peripheral neuroectodermal tumor (PPNET) located in the kidney was promptly excluded: Histologically, the tumor was a clear cell renal cell carcinoma (RCC) and we did not observe an EWSR1 gene rearrangement. The constitutional origin of this alteration was established. We report on the second case of RCC in a patient with a constitutional t(11;22). The t(11;22)(q23;q11.2) is the main recurrent germline translocation in humans. Unbalanced translocation can be transmitted to the progeny and can cause Emanuel syndrome. Our observation alerts cancer cytogeneticists to the fortuitous discovery of the constitutional t(11;22) in tumor cells. This translocation appears grossly similar to the t(11;22)(q24;q12) of PPNET and should be evoked if present in all cells of a tumor other than PPNET. This is important when providing appropriate genetic counseling. Moreover, the potential oncogenic role of the t(11;22) and its predisposing risk of cancer are under debate. The family history of the patient revealed a disabled brother who died at an early age from colon cancer and a sister with breast cancer. This observation reopens the issue of a link between the constitutional t(11;22) and cancer, and the utility of cancer prevention workups for t(11;22) carriers.
  Cancer Genetics 10/2012;
• Article: Strength of molecular cytogenetic analyses for adjusting the diagnosis of renal cell carcinomas with both clear cells and papillary features: a study of three cases.

  Juliette Haudebourg, Benjamin Hoch, Thibault Fabas, Nathalie Cardot-Leccia, Fanny Burel-Vandenbos, Annick Vieillefond, Jean Amiel, Jean-François Michiels, Florence Pedeutour
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  ABSTRACT: Histological features are usually sufficient for providing an accurate diagnosis of renal cell carcinomas (RCC). However, the morphological appearance might sometimes be misleading. For instance, RCC with papillary areas and extensive clear cell changes may be difficult to classify either as clear cell renal carcinoma or as papillary renal cell carcinoma (pRCC). We used the combination of immunohistochemistry, conventional cytogenetics, fluorescence in situ hybridization (FISH), bacterial artificial chromosomes comparative genomic hybridization arrays and high-density single nucleotides polymorphism arrays (SNP arrays) to characterize three cases of RCC showing a predominant cytology of cells with clear cytoplasm and variable amounts of papillary areas. In accordance with the 2004 World Health Organization (WHO) classification, we initially assessed the diagnosis of clear cell RCC for one of the cases and unclassified RCC for the two remaining cases. However, because of a strong immunohistochemical labeling for alpha-methylacyl-CoA racemase, as well as the presence of a gain of chromosomes 7 and 17, we concluded that two of these tumors were actually pRCC. As for the third case, because of the presence of both pCCR and ccCCR molecular cytogenetic aberrations, including gains of chromosomes 7 and 17, loss of chromosome Y and whole chromosome 3 loss of heterozyosity (isodisomy), the final diagnosis was hybrid tumor cc-pRCC, so-called "unclassified RCC" according to the WHO classification. Our observations demonstrate the necessity to use immunohistochemical and cytogenetic tools in all cases of RCC showing unusual features. The combination of FISH and SNP arrays is prevailing for characterizing cases with hybrid features.
  Archiv für Pathologische Anatomie und Physiologie und für Klinische Medicin 09/2010; 457(3):397-404. · 2.49 Impact Factor
• Article: A novel case of t(X;1)(p11.2;p34) in a renal cell carcinoma with TFE3 rearrangement and favorable outcome in a 57-year-old patient.

  Juliette Haudebourg, Benjamin Hoch, Thibault Fabas, Fanny Burel-Vandenbos, Xavier Carpentier, Jean Amiel, Nathalie Cardot-Leccia, Jean-François Michiels, Florence Pedeutour
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  ABSTRACT: Renal cell carcinoma (RCC) with translocation involving Xp11.2 (Xp11.2-RCC) is a rare neoplasm that usually occurs in children and young adults. This incidence is underestimated in adults because its morphological similarities with clear-cell RCC or papillary RCC2,3, as well as immunohistochemical and cytogenetic analyses are not carried out systematically in adults. We present a novel case of Xp11.2-RCC in a 57-year-old woman. The histologic features were those of a clear-cell RCC. Molecular cytogenetic analysis showed an uncommon t(X;1)(p11.2;p34) with TFE3 rearrangement and no alteration of chromosome 3. The immunohistochemical analysis showed expression of the TFE3 protein. Only nine cases of (X;1)(p11.2;p34) have been published, most of them occurring in children or young adults. To our knowledge, this is the second report of such a translocation in a patient older than 55 years. After a follow-up period of 13 months, the patient showed no evidence of disease. The clinical outcome was favorable, indicating that this particular translocation might be associated with a good prognosis. This observation confirms that Xp11.2-RCC are very likely to be underestimated in adults older than 40 years, and it highlights the importance of performing immunohistochemical and cytogenetic analyses in RCC for accurate diagnosis.
  Cancer genetics and cytogenetics 07/2010; 200(2):75-8. · 1.54 Impact Factor