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ALK-TPM3 rearrangement in adult renal cell carcinoma: Report of a new case showing loss of chromosome 3 and literature review.
Cancer Genetics 2018 Februrary
Seven cases of translocation-associated renal cell carcinoma involving ALK (ALK-tRCC) were referenced in the last World Health Organization's classification (2016), in a group of emerging/provisional RCC. The first three cases were pediatric, medullary-based, associated with sickle-cell trait and showed a fusion of ALK with VCL. Thirteen cases have been further described. They displayed clinical, morphological and genomic heterogeneity. Most of them occurred in adults. None of the patients was affected by sickle-cell disease. We report a new case of ALK-tRCC in a 55-year-old woman. Genomic profile showed losses of chromosomes 3, 9 and 14, anomalies often observed in clear cell RCC. VHL mutation or morphological features suggesting a clear cell RCC were not detected. We identified an unbalanced rearrangement of ALK and TPM3. Review of the literature identified similar features in our case and previously published cases: heterogeneous solid architecture, eosinophilic cells, mucinous cytoplasmic elements, rhabdoid cells and intracytoplasmic lumina. These elements may constitute the basis of a pathological definition of ALK-tRCC. Their observation in a RCC should lead to perform molecular detection of ALK rearrangement. This may have a crucial importance for metastatic patients treatment since ALK rearrangements confer sensitivity to tyrosine kinases inhibitors such as crizotinib.
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