Study	Reason for exclusion
Aletti 2006b	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Aletti 2006c	Intervention was ultra‐radical (removal of tumour from diaphragm), but unclear whether those in comparison group received different form of ultra‐radical surgery.
Aletti 2009a	Comparison of ultra‐radical versus standard surgery groups not possible – low complexity scores also included possible small bowel resection.
Aletti 2009b	Comparison of ultra‐radical versus standard surgery groups not possible – low complexity scores also included possible small bowel resection.
Angioli 2012	< 100 participants in analysis.
Bahra 2013	Comparison not possible.
Barlin 2013	No multivariate analysis.
Bartl 2018	No comparator.
Bertelsen 1990	Comparison of ultra‐radical versus standard surgery groups not possible. It was also unclear whether women with recurrent disease were included.
Bristow 1999	Women with recurrent disease also included.
Butler 2012	< 100 participants; conference abstract.
Cai 2007	Comparisons were made between bowel resection versus no bowel resection regardless of the nature of surgery, so those in the no bowel resection group may have still received a form of ultra‐radical surgery. It was also unclear whether women with recurrent disease were included.
Campos 2014	Conference abstract.
Canlorbe 2018	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Chang 2012b	No ultra‐radical surgery.
Chereau 2011	Mixed FIGO stages; no multivariate analysis.
Chi 2004	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Chi 2009	Comparison between standard surgery and ultra‐radical surgery groups not possible as all women underwent extensive upper abdominal surgery.
Chua 2011	Comparison not of interest.
Clark 2012	Outcomes not of interest; conference abstract.
Clark 2014	Comparison not of interest.
Cormier 2012	No ultra‐radical surgery; conference abstract.
Cummins 2019	Conference abstract.
Davies 2019	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Eisenhauer 2006	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. Also unclear if women with recurrent disease included.
Eisenkop 1993	Participants in comparison standard surgery group also had extensive bowel surgery or diaphragmatic stripping (or both) which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Eisenkop 1998	Participants in comparison standard surgery group also had extensive bowel surgery or diaphragmatic stripping (or both) which is ultra‐radical. Women with recurrent disease were also included.
Eisenkop 2001	Comparison of ultra‐radical versus standard surgery groups not possible.
Eisenkop 2003	Comparison of ultra‐radical versus standard surgery groups not possible. Women with recurrent disease were also included.
Eisenkop 2006	Comparisons were made between splenectomy versus no splenectomy regardless of the nature of surgery, so those in the no splenectomy group may have still received a form of ultra‐radical surgery. Women with recurrent disease were also included.
Elgamal 2019	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Eng 2018	No multivariate analysis.
Eoh 2017	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Falconer 2020	Uncontrolled before‐after study.
Favero 2014	Comparison not of interest.
Ferrero 2014	Comparison not of interest.
Filippova 2019	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Fotopoulou 2012	Comparison not of interest; conference abstract.
Gockley 2019	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Gremeau 2014	Comparison not of interest.
Grimm 2017	No comparator.
Guyon 2014	Comparison not of interest.
Hamilton 2011	Comparison not of interest.
Hudry 2013	Comparison not of interest.
Hwang 2014	Mixed population; comparison not of interest.
Janda 2014	Comparison not of interest.
Jiang 2013	Abstract form only but appeared to be same study as Ren 2015 where multivariate analysis did not include surgery type.
Kato 2013a	Comparison not of interest.
Kato 2013b	Population not of interest.
Kehoe 2013	Comparison not of interest.
Kim 2011	Comparison not of interest.
Kolev 2014	Recurrent cancer.
Kommoss 2010	Comparison between groups not possible as both groups also included participants undergoing bowel resection.
Kristensen 2014	Borderline tumours.
Kuhn 1998	Participants in comparison standard surgery group also had extensive bowel surgery or diaphragmatic stripping (or both), which is ultra‐radical. Women with recurrent disease were also included.
Laios 2019	No comparator.
Lee 2017	Conference abstracts.
Li 2014	Comparison not of interest.
Liberale 2019	Conference abstract.
Liu 2013a	Germ cell tumours; < 100 participants.
Liu 2013b	Germ cell tumours; article in Chinese.
Martinez 2014	Conference abstract.
McCann 2011	No multivariate analysis.
Muallem 2018	No multivariate analysis.
Oseledchyk 2016	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Oshita 2013	Included only stages pT1‐2.
Park 2011	No ultra‐radical surgery; conference abstract.
Pathiraja 2011	< 100 participants; conference abstract.
Pathiraja 2013	< 100 participants; outcomes not of interest.
Pelissier 2018	No comparator.
Perri 2013	Comparison not of interest.
Phillips 2018	No multivariate analysis.
Pushpalatha 2011	Comparison not of interest.
Qin 2012	No meta‐analysis; comparison not of interest.
Ratnavelu 2014	< 100 participants; conference abstract.
Ren 2015	Multivariate analysis did not include surgery type.
Rodriguez 2012	Women with suboptimal debulking were excluded (see also full publication Rodriguez 2013).
Rodriguez 2013	Women with suboptimal debulking were excluded.
Rouzier 2010	Mixed population; comparison not of interest.
Sagara 2019	No multivariate analysis.
Sandadi 2014	Comparison not of interest.
Scalici 2014	Comparison not of interest.
Sehouli 2010	Comparison not of interest.
Soo Hoo 2015	No multivariate analysis.
Stefanović 2011	< 100 participants.
Sundar 2014	< 100 participants; conference abstract.
Sundar 2018	Conference abstract.
Sundar 2019	Conference abstract.
Suzuki 2008	Conference abstract.
Szczesny 2016	Conference abstract.
Tozzi 2019	Participants in comparison standard surgery group also had extensive bowel surgery, which is ultra‐radical. It was also unclear whether women with recurrent disease were included.
Tsolakidis 2010a	Comparison between 'standard surgery' and 'ultra‐radical surgery' groups not possible as all women underwent diaphragmatic stripping.
Tsolakidis 2010b	Comparison between standard surgery and ultra‐radical surgery groups not possible as all women underwent diaphragmatic stripping.
van de Laar 2014	Protocol for a new study; applies to recurrent cancer.
Vidal 2016	No comparator.
von Hugo 1989	Unclear if women with recurrent disease were included.
Wallace 2016	No comparator.
Wat 2012	< 100 participants; conference abstract.
Wimberger 2007	Comparison of ultra‐radical versus standard surgery groups not possible, as the comparative groups include participants who had both types of surgery.
Wright 2012	Outcomes not of interest.
Yildirim 2014	No comparator.
Zamurovic 2013	No multivariate analysis.
Zapardiel 2012	No multivariate analysis.