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Mini oral session - Sarcoma

1523MO - Initial active surveillance strategy for patients with peripheral sporadic desmoids: A multicentre phase II observational trial


17 Sep 2021


Mini oral session - Sarcoma


Tumour Site

Soft Tissue Sarcomas


Sylvie Bonvalot


Annals of Oncology (2021) 32 (suppl_5): S1111-S1128. 10.1016/annonc/annonc712


S. Bonvalot1, L. Lam2, A. Le Cesne3, N. Penel4, J. Blay5, A. Michot6, C.M. Chevreau7, P. Anract8, D. Waast9, S. Piperno-Neumann10, F. Duffaud11, K. Malekzadeh2, C. Honoré12, C. Le Pechoux13, N. Cozic14

Author affiliations

  • 1 Surgical Oncology, Institut Curie, 75005 - PARIS/FR
  • 2 Statistics, Gustave Roussy, 94160 - Villejuif/FR
  • 3 Medical Oncology, Gustave Roussy - Cancer Campus, 94805 - Villejuif/FR
  • 4 Medical Oncology, Centre Oscar lambret, 59000 - Lilles/FR
  • 5 Medicine Department, Centre Léon Bérard, 69008 - Lyon/FR
  • 6 Surgical Oncology, Institut bergonié, 31000 - Bordeaux/FR
  • 7 Oncology Department, Institut Universitaire du Cancer -Toulouse- Oncopole, 31059 - Toulouse/FR
  • 8 Orthopedics, APHP, 75014 - Paris/FR
  • 9 Orthopedics, CHU Nantes, 31000 - Nantes/FR
  • 10 Medical Oncology, Institut Curie, 75005 - PARIS/FR
  • 11 Aphp Marseilles, APHP Marseilles, 34000 - Marseilles/FR
  • 12 Surgical Oncology, Gustave Roussy, 94160 - Villejuif/FR
  • 13 Radiation Oncology, Gustave Roussy, 94160 - Villejuif/FR
  • 14 Bio Statistics, Gustave Roussy, 94160 - Villejuif/FR


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Abstract 1523MO


Desmoid tumors (DT) are characterized by an unpredictable course. Most of the existing literature consists of retrospective studies. In a previous double-blind phase 3 trial comparing sorafenib and placebo, the 2-year Progression Free Survival (PFS) rate of the placebo group was 36% (Gounder NEJM 2018). However, assigned patients had already progressive or recurrent DT. The primary endpoint of this observational phase 2 study was to evaluate PFS and treatments at progression of newly diagnosed sporadic DT. Secondary endpoints included pain evaluation and record of continued surveillance or treatments after progression.


NCT01801176 was conducted in 9 hospitals from the French Sarcoma Group. Adults with histologically documented, primary DT, located on superficial trunk or extremities, not previously treated were proposed to Active Surveillance (AS) after signed informed consent. MRI were performed at 1, 3 and then each 6 months, tumor size was centrally assessed (RECIST). Pain evaluation was scored by CTAV4.


Between 2012 and 2015, 100 patients (pts) were enrolled. Female/male ratio was 8; median age was 35.5 years (IQR 26-45). Locations were: extremities n=28, abdominal wall n = 49, thoracic wall n = 23. Median follow up was 46.6 months (IQR 36.8–61.1). PFS at 2 and 3 years were 59.1% (49.2-68.4) and 53.4% (43.5-63.1). The best response was: CR: 8/90 pts (8.9%); PR: 20/90 pts (22.2%); SD: 60/90 pts (66.7%); Progression (P) = 2/90 pts (2.2 %), missing n =10 pts. Median Time to spontaneous response was 38.6 months (29.8-NA). Median TTP was 6.74 months (5.65-10.65). Median ratio of Tumor size/Tumor baseline size decreased after 9 months. Median visual pain score at 3-months was 0 (0-0.75). Age, location, tumor size and betacatenin mutations did not impact PFS in the Cox model. At progression (n = 48 patients), 25 continued AS, 4 received cryoablation, 4 received radiotherapy, 10 hormonal treatment, 4 chemotherapy, and 1 was operated.


Active surveillance of newly diagnosed DT is an effective strategy to better select indications for treatment and spare patients from aggressive treatments when unnecessary. The onset of the decrease of the ratio of median tumor size/baseline size may take 9 months.

Clinical trial identification


Editorial acknowledgement

Legal entity responsible for the study

The authors.


National Grant from Institut National du Cancer, INCa, France.


All authors have declared no conflicts of interest.

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