Profs Domenica Lorusso and Jean-Sebastien Frenel share expert insights on the PYNNACLE Phase 2 interim analysis at ESGO 2026. The PYNNACLE study evaluates rezatapopt*, a first-in-class p53 reactivator, in TP53 Y220C–mutant advanced solid tumours, including ovarian cancer.

 

In this video, the experts discuss: 

  • TP53, the Y220C variant, and the rationale for mutant p53 reactivation 
  • Study overview and practice implications, spotlighting ovarian cancer 
  • Testing strategies for early and accurate patient identification 

 

Clinical takeaways

  • Rezatapopt is a first-in-class investigational p53 reactivator that selectively binds to the mutated p53 Y220C protein, stabilising its structure to restore wild-type tumour suppressor activity   
  • Rezatapopt demonstrates rapid, durable and broad antitumour activity in heavily pretreated patients with TP53 Y220C-mutated advanced ovarian cancer, where effective targeted therapies and biomarkers are limited  
  • Looking ahead, it will be important to prioritise early and accurate identification through up-front comprehensive genomic profiling using NGS with TP53 gene coverage. Tissue is preferred; when tissue is limited, selected ctDNA assays capable of excluding CHIP may be used 

 

*Rezatapopt is an investigational agent which is not approved by a regulatory agency

  • Educate on the role of TP53 as a tumour suppressor gene, its mutation in cancer, and the significance of the Y220C variant​
  • Highlight the importance of treating cancers based on genomic mutations​
  • Emphasise the need for genomic testing to identify patients with the TP53 Y220C mutation​
  • Educate clinicians on the ongoing clinical trials, such as the PYNNACLE trial

Prof. Domenica "Ketta" Lorusso obtained her degree in Medicine and Surgery in 1995, her residency in Obstetrics and Gynecology in 1999 and her PhD in Obstetrics and Gynecology in 2003. She is currently Associate Professor of Obstetrics and Gynecology at the Catholic University of Rome and responsible for clinical research at Fondazione Policlinico Gemelli IRCCS.

She is an active member of the European Network of Gynaecological Oncological Trial groups (ENGOT), where she leads the Gynecological Cancer Academy (since 2020). Dr Lorusso is a member of the Board of Directors of the Gynecologic Cancer InterGroup (GCIG), where she is the past chair of the Endometrial Cancer Committee and the Nomination and Meeting Committee. Currently, she is a member of the ESGO Council and scientific coordinator of the ESMO Gynaecological Cancers Congress. She is involved in preclinical and clinical research in gynaecological cancer, and she is the author of more than 250 papers on gynaecological cancers. Her work has hugely contributed to improving the quality of care and clinical outcome and to reducing the toxicity of treatments in women with advanced gynaecological malignancies.

Prof. Domenica Lorusso has received financial support/sponsorship for research support, consultation, or speaker fees from the following companies:

MSD, GSK, Novartis, Clovis Oncology, AstraZeneca, Eisai, PharmaMar, ImmunoGen, Genmab

Medical oncologist at the Institut de Cancérologie de l’Ouest and a researcher in Team 7 of CRCI2NA. He is also affiliated with the PISTER programme of SIRIC ILIAD, dedicated to cellular oncology.

His research focuses on two main areas: circulating cancer biomarkers for the detection and characterisation of solid tumours through blood-based approaches, and epigenetics, specifically the mechanisms acquired by cancer cells over time and under treatment pressure.

His work aims to better understand treatment resistance and to develop epigenetic strategies to prevent or overcome it, with current research spanning brain tumours, gynecological cancers, and breast cancer.

Profs Domenica Lorusso and Jean-Sebastien Frenel share expert insights on the PYNNACLE Phase 2 interim analysis at ESGO 2026. The PYNNACLE study evaluates rezatapopt*, a first-in-class p53 reactivator, in TP53 Y220C–mutant advanced solid tumours, including ovarian cancer.

 

In this video, the experts discuss: 

  • TP53, the Y220C variant, and the rationale for mutant p53 reactivation 
  • Study overview and practice implications, spotlighting ovarian cancer 
  • Testing strategies for early and accurate patient identification 

 

Clinical takeaways

  • Rezatapopt is a first-in-class investigational p53 reactivator that selectively binds to the mutated p53 Y220C protein, stabilising its structure to restore wild-type tumour suppressor activity   
  • Rezatapopt demonstrates rapid, durable and broad antitumour activity in heavily pretreated patients with TP53 Y220C-mutated advanced ovarian cancer, where effective targeted therapies and biomarkers are limited  
  • Looking ahead, it will be important to prioritise early and accurate identification through up-front comprehensive genomic profiling using NGS with TP53 gene coverage. Tissue is preferred; when tissue is limited, selected ctDNA assays capable of excluding CHIP may be used 

 

*Rezatapopt is an investigational agent which is not approved by a regulatory agency

  • Educate on the role of TP53 as a tumour suppressor gene, its mutation in cancer, and the significance of the Y220C variant​
  • Highlight the importance of treating cancers based on genomic mutations​
  • Emphasise the need for genomic testing to identify patients with the TP53 Y220C mutation​
  • Educate clinicians on the ongoing clinical trials, such as the PYNNACLE trial

Medical oncologist at the Institut de Cancérologie de l’Ouest and a researcher in Team 7 of CRCI2NA. He is also affiliated with the PISTER programme of SIRIC ILIAD, dedicated to cellular oncology.

His research focuses on two main areas: circulating cancer biomarkers for the detection and characterisation of solid tumours through blood-based approaches, and epigenetics, specifically the mechanisms acquired by cancer cells over time and under treatment pressure.

His work aims to better understand treatment resistance and to develop epigenetic strategies to prevent or overcome it, with current research spanning brain tumours, gynecological cancers, and breast cancer.

Prof. Domenica "Ketta" Lorusso obtained her degree in Medicine and Surgery in 1995, her residency in Obstetrics and Gynecology in 1999 and her PhD in Obstetrics and Gynecology in 2003. She is currently Associate Professor of Obstetrics and Gynecology at the Catholic University of Rome and responsible for clinical research at Fondazione Policlinico Gemelli IRCCS.

She is an active member of the European Network of Gynaecological Oncological Trial groups (ENGOT), where she leads the Gynecological Cancer Academy (since 2020). Dr Lorusso is a member of the Board of Directors of the Gynecologic Cancer InterGroup (GCIG), where she is the past chair of the Endometrial Cancer Committee and the Nomination and Meeting Committee. Currently, she is a member of the ESGO Council and scientific coordinator of the ESMO Gynaecological Cancers Congress. She is involved in preclinical and clinical research in gynaecological cancer, and she is the author of more than 250 papers on gynaecological cancers. Her work has hugely contributed to improving the quality of care and clinical outcome and to reducing the toxicity of treatments in women with advanced gynaecological malignancies.

Prof. Domenica Lorusso has received financial support/sponsorship for research support, consultation, or speaker fees from the following companies:

MSD, GSK, Novartis, Clovis Oncology, AstraZeneca, Eisai, PharmaMar, ImmunoGen, Genmab

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