1. Low‐burden TP53 mutations represent frequent genetic events in CLL with an increased risk for treatment initiation
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Tamás László, Lili Kotmayer, Viktória Fésüs, Lajos Hegyi, Stefánia Gróf, Ákos Nagy, Béla Kajtár, Alexandra Balogh, Júlia Weisinger, Tamás Masszi, Zsolt Nagy, Péter Farkas, Judit Demeter, Ildikó Istenes, Róbert Szász, Lajos Gergely, Adrienn Sulák, Zita Borbényi, Dóra Lévai, Tamás Schneider, Piroska Pettendi, Emese Bodai, László Szerafin, László Rejtő, Árpád Bátai, Mária Á Dömötör, Hermina Sánta, Márk Plander, Tamás Szendrei, Aryan Hamed, Zsolt Lázár, Zsolt Pauker, Gáspár Radványi, Adrienn Kiss, Gábor Körösmezey, János Jakucs, Péter J Dombi, Zsófia Simon, Zsolt Klucsik, Mihály Gurzó, Márta Tiboly, Tímea Vidra, Péter Ilonczai, András Bors, Hajnalka Andrikovics, Miklós Egyed, Tamás Székely, András Masszi, Donát Alpár, András Matolcsy, and Csaba Bödör
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chronic lymphocytic leukaemia ,TP53 ,NGS ,Pathology ,RB1-214 - Abstract
Abstract TP53 aberrations predict chemoresistance and represent a contraindication for the use of standard chemoimmunotherapy in chronic lymphocytic leukaemia (CLL). Recent next‐generation sequencing (NGS)‐based studies have identified frequent low‐burden TP53 mutations with variant allele frequencies below 10%, but the clinical impact of these low‐burden TP53 mutations is still a matter of debate. In this study, we aimed to scrutinise the subclonal architecture and clinical impact of TP53 mutations using a sensitive, NGS‐based mutation analysis in a ‘real‐world’ cohort of 901 patients with CLL. In total, 225 TP53 mutations were identified in 17.5% (158/901) of the patients; 48% of these alterations represented high‐burden mutations, while 52% were low‐burden TP53 mutations. Low‐burden mutations as sole alterations were identified in 39% (62/158) of all mutated cases with 82% (51/62) of these being represented by a single low‐burden TP53 mutation. Patients harbouring low‐burden TP53 mutations had significantly lower time to first treatment compared to patients with wild‐type TP53. Our study has expanded the knowledge on the frequency, clonal architecture, and clinical impact of low‐burden TP53 mutations. By demonstrating that patients with sole low‐burden TP53 variants represent more than one‐third of patients with TP53 mutations and have an increased risk for treatment initiation, our findings strengthen the need to redefine the threshold of TP53 variant reporting to below 10% in the routine diagnostic setting.
- Published
- 2024
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