EVOLUTION OF PARP INHIBITORS IN OVARIAN CANCER Prof Dr Sven Mahner, MD Chair and Director Department of Obstetrics & Gynaecology University Hospital Munich, Ludwig-Maximilians-University, Munich, Germany ESMO 2018 Munich, Germany
Ovarian carcinoma is a cancer with lethal outcome 5–11 /100,000 Incidence rate1 7th most common cancer in women worldwide1 4th most common gynaecological cancer after breast, cervical & uterine carcinoma2 8th most lethal cancer in women1 WCRF: Worldwide data. https://www.wcrf.org/dietandcancer/ovarian-cancer . Accessed 5 October 2018. World Health Organization. Cancer Today. http://gco.iarc.fr/today/online-analysis-table?v=2018&mode=cancer&mode_population=continents&population=900&populations=900&key=asr&sex=2&cancer=39&type=0&statistic=5&prevalence=0&population_group=0&ages_group%5B%5D=0&ages_group%5B%5D=17&nb_items=5&group_Accessed 5 October 2018.
Advances in chemotherapy before maintenance in ovarian cancer Five-year survival 15% 30% First use of carboplatin First use of cisplatin First use of paclitaxel Key advances in chemotherapy 1970 1980 1990
Next line of chemotherapy Standard chemotherapy strategy ‘Optimisation of treatment-free interval’ Debulking surgery Next line of chemotherapy Chemotherapy Watch & Wait Tumour volume treatment-free interval Recurrence Symptoms Time
traditional Watch & Wait PARPi Maintenance therapy A paradigm shift with the introduction of PARP inhibitor maintenance therapy Debulking surgery Chemotherapy traditional Watch & Wait PARPi Maintenance therapy Tumour volume Treatment-free interval Recurrence Symptoms Point of decision Maintenance Maintenance goals: Optimise benefit of chemotherapy Increase disease control and symptoms Improve survival (PFS & OS) Minimise toxicity and negative effects on QoL Time
Development of PARP inhibitors 1960 1980 2000 2010 2012 2013 2014 2016 2017 2018 1963 Detection of poly (ADP-ribose) in nuclei 1977 Purification of PARP-1 1980 Discovery of benzamide as a competitive PARP inhibitor Role for nuclear PARPs in DNA damage repair 1987 Cloning of PARP-1 gene 1994/1995 Cloning of BRCA1 & BRCA2 genes 2005 BRCA1/2-deficient cells are sensitive to PARPi 2012 Study 19 Phase II olaparib 2013 Start NOVA study 2014 Approval olaparib in gBRCA 2017 Approval niraparib for gBRCA and non- gBRCA in US & EU ARIEL 3 rucaparib SOLO2 olaparib 2016 NOVA results at ESMO 2018 Approval olaparib tablets* in US & EU Approval rucaparib* in US * independent of BRCA mutation status Adapted from Lin kY, Kraus WL. Cell 2017;169(2):183. doi: 10.1016/j.cell.2017.03.034.