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Eur J Cancer. 2014 Nov;50(17):3021-8. doi: 10.1016/j.ejca.2014.09.004. Epub 2014 Sep 27.

Preclinical and clinical evidence of activity of pazopanib in solitary fibrous tumour.

Author information

1
Adult Mesenchymal Tumor Medical Oncology Unit, Cancer Medicine Department, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy. Electronic address: silvia.stacchiotti@istitutotumori.mi.it.
2
Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.
3
Medical Oncology Unit 'Sandro Pitigliani', S. Stefano Civil Hospital, Prato, Italy.
4
Medical Oncology, IRCCS - Istituto di Candiolo, Candiolo, Italy.
5
Department of Oncology, Hematology and Respiratory Diseases, University of Modena and Reggio Emilia, Modena, Italy.
6
Department of Oncology, University Hospital of Palermo, Palermo, Italy.
7
Department of Radiology, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.
8
Department of Anatomic Pathology, General Hospital of Treviso, Treviso, Italy.
9
Pharmacy Unit, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.
10
Adult Mesenchymal Tumor Medical Oncology Unit, Cancer Medicine Department, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.
11
Melanoma and Sarcoma Unit, Department of Surgery, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.
12
Melanoma and Sarcoma, Surgery Department, Istituto Europeo di Oncologia, Milan, Italy.
13
Laboratory of Experimental Molecular Pathology, Department of Diagnostic Pathology and Laboratory, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.

Abstract

BACKGROUND:

To explore the activity of pazopanib in solitary fibrous tumour (SFT).

PATIENTS AND METHODS:

In a preclinical study, we compared the activity of pazopanib, sorafenib, sunitinib, regorafenib, axitinib and bevacizumab in a dedifferentiated-SFT (DSFT) xenotransplanted into Severe Combined Immunodeficiency (SCID) mice. Antiangiogenics were administered at their reported optimal doses when mean tumour volume (TV) was 80 mm(3). Drug activity was assessed as TV inhibition percentage (TVI%). From May 2012, six consecutive patients with advanced SFT received pazopanib, on a national name-based programme. In one case sunitinib was administered after pazopanib failure.

RESULTS:

In the xenograft model, pazopanib showed the lowest antitumour activity (21%TVI), while regorafenib was the most active (95%TVI). Sorafenib, bevacizumab, sunitinib were markedly active (78/70/65%TVI). Axitinib was marginally active (51%TVI). In the retrospective case-series, three patients carried malignant-SFT (MSFT), three DSFT. Best Response Evaluation Criteria in Solid Tumour (RECIST) responses were: three stable disease (SD), all MSFT, three progressive disease (PD), all DSFT, corresponding to one partial response (PR), two SD, three PD by Choi criteria. Median-progression-free survival was 3 months (range 1-15). In one patient, sunitinib was started after pazopanib failure, with a response.

CONCLUSIONS:

In dedifferentiated-SFT xenograft pazopanib induced a marginal antitumour activity, while regorafenib appeared the most active and promising agent. When administered in patients, pazopanib showed a modest activity in terms of tumour growth stabilisation, observed only in non-dedifferentiated cases.

KEYWORDS:

Chemotherapy; Pazopanib; Sarcoma; Solitary fibrous tumour; Sunitinib; Tyrosine kinase

PMID:
25269954
DOI:
10.1016/j.ejca.2014.09.004
[Indexed for MEDLINE]

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