Pazopanib is an active treatment in desmoid tumour/aggressive fibromatosis
© Martin-Liberal et al.; licensee BioMed Central Ltd. 2013
Received: 12 November 2013
Accepted: 21 November 2013
Published: 26 November 2013
Desmoid tumours/aggressive fibromatosis (DT/AF) are infrequent soft-tissue neoplasms. They usually behave as indolent diseases. However, they may grow locally infiltrating or compressing adjacent structures. The role of local treatment is limited and only a few drugs have shown activity.
We report the outcome of two patients affected by progressive DT/AF treated with the angiogenesis inhibitor pazopanib in two different institutions. Both patients achieved dramatic improvement in their symptoms and radiological signs of response. The clinical benefit lasted for more than 1 year and it is still ongoing.
Pazopanib is an active treatment in DT/AF. It is the first time this has been reported.
Desmoid tumours/aggressive fibromatosis (DT/AF) are rare soft-tissue neoplasms that usually arise from the abdomen although extremities are also a common site of presentation [1, 2]. They may be associated with genetic conditions such as Gardner’s syndrome . Patients’ survival is usually good as DT/AF lack the capacity to metastasize although anatomical disease site is important. Interestingly, the treatment paradigm has changed in the last decade. Aggressive upfront approaches are now under debate since nearly 50% of patients have relatively indolent disease . Thus, surveillance at initial presentation is the current standard of care in most centres. However, it may become a symptomatic disease as it can grow locally infiltrating or compressing adjacent structures .
Surgery is one treatment choice when technically feasible however rates of recurrence and post-treatment morbidity are high . Radiotherapy is also an option but there are real concerns surrounding late effects including development of second malignancies which is important to consider given the young age of most patients. When local treatment with curative intent is not achievable, systemic treatment should be considered. A widely accepted strategy in first-line setting is hormone treatment, based on the relatively frequent overexpression of oestrogen receptors, used in combination with nonsteroidal anti-inflammatory drugs (NSAIDs) [7, 8]. If this treatment proves ineffective, cytotoxic chemotherapy is a valid alternative. Pegylated liposomal doxorubicin has shown signs of activity although it is not without toxicity . Several targeted agents have been recently assessed with promising results. The, tyrosine-kinase inhibitor imatinib has been proven to have activity in phase II studies [10, 11]. Also, recent encouraging data with the antiangiogenic drug sorafenib have been published where the rate of clinical benefit was very high (70%). In addition, partial response (PR) and stable disease (SD) rates were 25% and 70% respectively. Furthermore, 92% of patients showed features of increased tumour fibrosis and loss of cellularity as demonstrated by an early change in MRI T2 signal . These data support further investigation into the role of antiangiogenic agents in DT/AF.
Pazopanib is one of the latest antiangiogenic drugs developed. It has recently been approved by the U.S. Food and Drug Administration (FDA) and by the European Medicines Agency (EMA) for the treatment of advanced renal cancer and soft-tissue sarcomas (STS). We present here the first report of clinical activity of pazopanib in DT/AF. These encouraging results might be the initial step in the development of a new effective therapy this challenging disease.
This is the report of the clinical outcome of two patients affected by unresectable DT/AF treated with pazopanib in two different UK institutions: The Royal Marsden Hospital, London and Belfast City Hospital, Belfast. Data were retrospectively collected and imaging was reviewed by a Sarcoma Unit radiologist from The Royal Marsden Hospital.
Patient 1 is a female who presented at the age of 42 years with a painful mass in the right axilla. A biopsy showed features consistent with DT/AF. The patient did not have personal or family history of Gardner’s syndrome or colonic polyps. Surgical resection was performed in two occasions but residual disease remained. As the pain in the axilla increased, treatment with tamoxifen 40 mg once daily (od) was initiated one year after the second surgery. However, there was an increase in the size of the mass and worsening of symptoms in the form of restricted movement and neuropathic pain, so pegylated liposomal doxorubicin was advised. Unfortunately, chemotherapy had to be stopped after one cycle due to an allergic reaction. Subsequent treatment with methotrexate and vinblastine was given. Symptoms were stabilized although the patient experienced disabling toxicities such as severe constipation and neuropathy. After five months, an MRI showed progressive disease (PD), the tumour measuring 15 × 5.9 cm.
The patient is currently tolerating pazopanib without significant side effects. Furthermore, her tumour has remained stable in size but with T2 changes in MRI suggestive of response for nearly eighteen months. The clinical benefit has been very clear and in particular pain is well controlled, which was the main factor impairing the patient’s quality of life.
Patient 2 is a female who presented at the age of 16 years with a painful left axillary mass. The histological analysis was consistent with DT/AF. The patient did not have a history of Gardner´s syndrome or colonic polyps. Incomplete resection was performed and for the following ten years the patient remained asymptomatic. After that time, she developed pain and impairment in the abduction of her left arm. An MRI confirmed tumour recurrence, with involvement of the triceps and inferior deltoid muscles. Surgery was not advised and the patient was started on systemic treatment with high dose NSAIDs; three months on MRI scan showed no significant changes and limitation in the abduction of the arm persisted. After one year of treatment, the patient became pregnant and treatment was discontinued. Unfortunately, shortly after the symptoms dramatically worsened. Pegylated liposomal doxorubicin was initiated when the patient was in the third trimester of her pregnancy but with no radiological nor symptomatic benefit. As there were continued significant limitations in arm movement, the patient was very keen to pursue further treatment. Therefore, tumour resection followed by radiotherapy was performed. After these procedures, the patient regained an almost complete range of movement in her arm.
One year after her last operation, an MRI showed two new sites of disease. These findings were associated with worsening of the pain in spite of NSAIDs. Tamoxifen, together with continuation of high dose NSAIDs, was then prescribed. Six months on, further tumour growth and worsening symptoms suggested that the treatment was ineffective.
This report demonstrates for the first time that pazopanib is an active treatment in DT/AF.
The lack of effective therapeutic options and its high morbidity make DT/AF a challenging disease. The promising results observed with sorafenib suggested that angiogenesis might play an important role in this condition . Although DT/AF is not strictly considered a malignancy, the mechanisms that lead to uncontrolled monoclonal cellular proliferation and survival are similar to those in cancer . Angiogenesis is one of the most important processes in carcinogenesis and its relevance in soft-tissue tumours has also been demonstrated . Several studies confirm the key role of some of its effectors such as the vascular endothelial growth factor (VEGF) and the different isoforms of its receptor (VEGFR) [15–19]. Another crucial protein in the formation of new tumour vessels is the platelet-derived growth factor PDGF . Interestingly, both sorafenib and pazopanib inhibit both VEGFR and the PDGF receptor (PDGFR) . Conversely imatinib -a tyrosine-kinase inhibitor which also demonstrates promising activity in DT/AF [10, 11]- has effects on PDGFR but not on VEGFR . These data suggest that the efficacy of these drugs in DT/AF might be due to their antiangiogenic activity mediated by the inhibition of different key effectors.
Pazopanib is the first antiangiogenic drug that has shown successful results in a phase III trial in STS . We demonstrate in this report is that it is also active in DT/AF. Furthermore although it has side effects, as shown in Patient 1, it is generally better tolerated than conventional chemotherapy. This is crucial in a disease such as DT/AF, where curative options are scarce and the principal aim of the treatment is to improve quality of life. In addition, clinical benefit lasted for over one year in both cases and it is still ongoing. Fortunately, the relative lack of cumulative toxicity of pazopanib compared to standard chemotherapy allows an indeterminate duration of treatment.
In conclusion, pazopanib is a promising therapeutic option in DT/AF. However, owing to the retrospective nature of this report and the small number of patients this observation clearly needs to be confirmed in prospective studies. Thus, the French Sarcoma Group is currently conducting a phase II trial that assesses the efficacy and tolerance of pazopanib in DT/AF (ClinicalTrials.gov identifier NCT01876082). This encouraging novel strategy deserves further investigation.
Written informed consent was obtained from the patients for publication of this Case Report and any accompanying images. Copies of the written consents are available for review by the Editor-in-Chief of this journal.
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