Prospective Study Evaluating the Treatment Outcomes for Localised Recurrent, Resectable Retroperitoneal Liposarcoma
ReLaPSe
ReLaPSe
Sponsor study identifier
observational
100
8 countries
13
Study Start
September 5, 2024
Actual (reported)Primary Completion
December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Study Completion
December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
The aim of the study is to collect prospective data on the treatment outcomes in patients with first localized, resectable recurrent retroperitoneal well-differentiated and/or dedifferentiated liposarcoma undergoing curative intent treatment. Patients enrolled in this study will form a validation cohort of the TARPSWG recurrent RPS nomogram. The treatment decision (surgery alone, or preoperative RT +/- chemotherapy followed by surgery) is per the institutional multidisciplinary team recommendation.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
September 5, 2024
Actual (reported)January 4, 2026
Actual (reported)January 30, 2026
Actual (reported)December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Abdominopelvic recurrence-free survival (ARFS). .
Defined as the time from the date of treatment start (either surgery, chemo or RT) for 1st recurrent LPS to the date of radiological abdominopelvic relapse or death whichever occurred first. Liver metastases will be regarded as distant metastatic events. rather than abdominopelvic relapse
Up to 5 years.
Overall survival
Up to 5 years.
Cumulative incidence of 2nd local recurrence (in a competing risk framework)
Up to 5 years.
Cumulative incidence of distant metastases (in a competing risk framework).
Up to 5 years.
Cumulative incidence of in-field relapse for those who had preoperative radiotherapy (in a competing risk framework)
Up to 5 years.
Pathological response using the EORTC-STBSG criteria.
At surgical resection.
This includes patient who have had any chemotherapy.
This includes patients who had surgery alone, surgery with postoperative radiotherapy and/or any chemotherapy.
Patients diagnosed with localized, resectable recurrent retroperitoneal liposarcoma attending and having treatment at the study site.
Emory Winship Cancer Institute
Atlanta, Georgia, 30322, United States
Brigham and Women's Hospital
Boston, Massachusetts, 02115, United States
Angela Hong
Chris O'Brien Lifehouse
First Submitted
January 4, 2026
First Posted
January 30, 2026
Study Start
September 5, 2024
Actual (reported)Primary Completion
December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Contact the study team to confirm eligibility.
OSU James Hospital
Columbus, Ohio, 43210, United States
MD Anderson Cancer Center
Houston, Texas, 77030, United States
Chris O'Brien Lifehouse
Camperdown, New South Wales, 2050, Australia
Prince of Wales Hospital
Randwick, New South Wales, 2031, Australia
Peter MacCallum Cancer Centre
Melbourne, Victoria, 3000, Australia
UZ Leuven
Leuven, Flemish Brabant, 3000, Belgium
A.C.Camargo Cancer Center - Fundacao Antonio Prudente
Liberdade, São Paulo, 01509-010, Brazil
The Princess Margaret Cancer Centre
Toronto, Ontario, M5G 2C4, Canada
Institut Curie Hospital
Paris, 75005, France
The Netherlands Cancer Institute
Amsterdam, North Holland, 1066 CX, Netherlands
Maria Sklodowska-Curie National Research Institute of Oncology
Warsaw, 00-001, Poland
Study Completion
December 2032
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Last Updated
July 15, 2026
Record last verified: 2026-07
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Source: ClinicalTrials.gov.
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