Whole-genome sequencing of a malignant granular cell tumor with metabolic response to pazopanib
2015
Granular cell tumors are an uncommon soft tissue neoplasm. Malignant granular cell tumors comprise T transitions, particularly when immediately preceded by a 5 ' G. A loss-of-function mutation was detected in a newly recognized tumor suppressor candidate, BRD7. No mutations were found in known targets of pazopanib. However, we identified a receptor tyrosine kinase pathway mutation in GFRA2 that warrants further evaluation. To the best of our knowledge, this is only the second reported case of a malignant granular cell tumor exhibiting a response to pazopanib, and the first whole-genome sequencing of this uncommon tumor type. The findings provide insight into the genetic basis of malignant granular cell tumors and identify potential targets for further investigation.
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