Chemoresistant pleomorphic rhabdomyosarcoma: whole exome sequencing reveals underlying cancer predisposition and therapeutic options

We report the case of a patient with a metastatic chemoresistant sarcoma. Considering the few therapeutic options, we performed an extensive sequencing of the tumor and leucocytes DNA. We identified a constitutional mutation in the MLH1 gene which was not expected considering the family history. Because of this mutation affecting genome stability, we expected that the tumor cells would be a good candidate for immune therapy with checkpoint inhibitors. we administrated an anti PD-1 antibody to the patient who achieved a complete tumor response. This observation underlines the overlap between tumoral and germline genetics and emphasizes the impact of genomic medicine for guiding treatment decision. (By Dr. Camille Tlemsani, )

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