%0 Journal Article
%@ 2296-5270 (Druck-Ausg.); 2296-5262 (Online-Ausg.)
%A Artzenroth, Jule Cecilia
%A Tintelnot, Joseph
%A Haag, Georg Martin
%A Gökkurt, Eray
%A Steffens, Johann
%A Stein, Alexander
%C Basel, Switzerland
%D 2023
%F heidok:35301
%I S. Karger AG, Medical and Scientific Publishers
%J Oncology Research and Treatment
%N 7-8
%P 320-325
%R 10.11588/heidok.00035301
%T Combining Poly-(ARD-Ribose) Polymerase and Programmed Cell Death Protein 1 Inhibition in a Patient with Esophagogastric Adenocarcinoma
%U https://archiv.ub.uni-heidelberg.de/volltextserver/35301/
%V 46
%X Introduction: Esophagogastric adenocarcinoma (EGA) is one of the leading causes of cancer-related mortality worldwide. Therapeutic options are limited for patients with recurrent or metastatic disease. Targeted therapy may be a suitable treatment for selected patients, but its efficacy remains elusive. Case Presentation: Here, a 52-year-old male patient with advanced EGA Siewert Type II shows a significant response to combination therapy with olaparib and pembrolizumab. After progression following first- and second-line therapy, including a programmed cell death ligand 1 (PD-L1) inhibitor, next-generation sequencing of a tumor sample was performed to identify possible molecular targets. A mutation in RAD51C, a member of the homology-directed repair (HDR) system, was identified in addition to high PD-L1 expression. As a result, therapy with the poly-(ARD-Ribose) polymerase (PARP) inhibitor olaparib and the programmed cell death protein 1 (PD1)-inhibitor pembrolizumab was initiated. A durable partial response lasting for more than 17 months was observed. A second molecular profiling from a newly occurring subcutaneous metastasis showed a loss of FGF10 but no fluctuations in the gene alteration of RAD51C and SMARCA4. Interestingly, the new lesion showed HER2-positivity (immunohistochemistry 3+ and fluorescence in situ hybridization [FISH]-positivity) in 30% of tumor cells. Conclusion: In this case, a long-lasting response to the combination of olaparib and pembrolizumab was observed despite previous treatment with a PD-L1 inhibitor. This case illustrates the need for further clinical trials to analyze the efficacy of PARP inhibitor combinations in EGA.
%Z Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz bzw. Nationallizenz frei zugänglich. *** This publication is freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.