Case Report: Successful Treatment of Solitary Fibrous Tumor with Selective Internal Radiation Therapy (SIRT)

This case report describes the innovative treatment of a 73-year-old woman with a Solitary Fibrous Tumor (SFT) using Selective Internal Radiation Therapy (SIRT) with Yttrium-90 resin microspheres. SFTs are rare tumors that pose significant treatment challenges, particularly in cases of recurrence or when the disease has metastasized. Systemic therapies often have limited effectiveness. In this case, the patient initially presented with a pelvic mass that was surgically resected, but she later developed metastatic disease in the liver. After experiencing severe side effects from targeted therapy with sunitinib, SIRT was chosen as an alternative treatment. Remarkably, the patient achieved substantial tumor reduction and symptom relief following this novel intervention. To our knowledge and following extensive literature search, this is the first documented instance of treating SFT with SIRT. It provides new insights into its potential as a therapeutic strategy, especially for cases where conventional treatments are inadequate or cause intolerable side effects. The success of SIRT, in this case, highlights its potential as a less invasive, locally targeted treatment option and may offer new hope for patients with similar conditions.

Keywords:

Solitary Fibrous Tumor (SFT)

;

Selective Internal Radiation Therapy (SIRT)

;

Hypervascular Tumor

;

Yttrium-90 Microspheres

Subject:

Public Health and Healthcare - Public Health and Health Services

Introduction

Solitary Fibrous Tumor (SFT) is a rare mesenchymal tumor that accounts for less than 2% of all soft tissue tumors [1]. These tumors predominantly affect middle-aged adults, typically between the ages of 20 and 70, and present equally in both men and women [2,3]. While initially described in the pleura, SFTs can occur in nearly any location, most commonly affecting the pleura, accounting for about 30% of cases [4]. However, these tumors are also found in other places, such as the meninges, abdominal cavity, trunk, and extremities. Intracranial SFTs are particularly rare, representing a small fraction of meningeal and intracranial tumors [5]. These tumors are often asymptomatic until they grow large enough to cause a mass effect on adjacent organs, leading to symptoms [6].

On contrast-enhanced Computed Tomography (CT) scans, SFTs typically appear as well-circumscribed, hypervascular tumors, often presenting as lobulated masses with necrosis, especially in more extensive tumors [7]. Approximately 65% of cases exhibit avid contrast enhancement in the arterial and early portal venous phases, with contrast washout in the delayed phase, particularly if fibrous components predominate [8,9]. Some tumors also show large collateral feeding vessels, which may aid in diagnosing more aggressive forms [8,9]. Heterogeneous enhancement, seen in up to 76.5% of aggressive SFT cases, reflects the presence of necrosis, hemorrhage, or cystic changes [8,9]. These radiologic features, including large feeding vessels and heterogeneity in enhancement, are critical in assessing the tumor’s aggressiveness and guiding treatment decisions, especially in more challenging anatomical locations like the abdomen or retroperitoneum [9]. SFTs display a mix of solid and cystic components on Magnetic Resonance Imaging (MRI) [9]. Solid areas are typically isointense to hypointense relative to skeletal muscle on both T1- and T2-weighted images, while cystic regions appear hyperintense [10]. These tumors show substantial enhancement after contrast administration, reflecting their vascularity, similar to CT imaging, and MRI is functional for identifying necrosis, hemorrhage, or cystic changes [10]. While distinguishing between indolent and aggressive SFTs is limited, 18F-Fluorodeoxyglucose Positron Emission Tomography (FDG-PET/CT) can detect metastasis and recurrence, as malignant SFTs tend to show higher FDG uptake [11]. It may also aid in monitoring treatment response, helping to assess disease progression and guide further management.

Histologically, SFTs are characterized by spindle-to-ovoid cells in a patternless distribution, with dense cellular areas alternating with hypocellular regions rich in stromal collagen [12]. Immunohistochemical staining, particularly for markers such as CD99, CD34, and BCL2, assists in differentiating SFT from other spindle cell tumors. Molecular genetic analysis is crucial in confirming the diagnosis, particularly identifying the NAB2-STAT6 gene fusion, which is highly specific and sensitive for SFT [13,14]. However, the differential diagnosis should include other soft tissue tumors like dedifferentiated liposarcoma, which may show overlapping features [15].

Management of SFT typically involves a multidisciplinary approach, with surgical resection being the primary treatment modality aimed at achieving wide margins to reduce recurrence risk [16]. Recurrence rates for SFTs vary, with estimates ranging from 10% to 20%, but some studies with more extended follow-up periods have reported recurrence rates exceeding 30% [17,18]. Factors such as the mitotic index, necrosis, KI67 index, and Telomerase Reverse Transcriptase (TERT) promoter mutations have been identified as significant predictors of recurrence [19]. Therefore, risk stratification using systems such as the modified Demicco score is crucial for guiding post-surgical management [19]. For patients who exhibit high-risk features, such as positive surgical margins or high mitotic count, adjuvant radiotherapy (RT) may reduce the risk of local recurrence [20]. However, no definitive overall survival benefit has been demonstrated in observational studies [20].

Systemic therapies for advanced SFT have been explored, but the rarity of the disease limits large-scale studies. Traditional chemotherapy has shown limited efficacy, with low response rates [21]. Anthracycline-based chemotherapy generally yields a modest response, with only a tiny proportion of patients showing tumor shrinkage, while a larger group achieves disease stabilization [23]. Progression-free survival with this treatment typically lasts a few months, and overall survival averages around one year [23]. Ifosfamide, another chemotherapy option, has limited efficacy, producing tumor responses in a small percentage of patients [23]. Dacarbazine, however, tends to perform better, offering a higher likelihood of tumor response and slightly longer progression-free intervals [23]. While less effective at shrinking tumors, Trabectedin is notable for its ability to stabilize disease in many cases, providing patients with a meaningful extension of disease control and overall survival [23].

Since Solitary Fibrous Tumors (SFTs) are highly vascularized, with the overexpression of angiogenic pathways such as Platelet-Derived Growth Factor Receptor (PDGFR) and Vascular Endothelial Growth Factor Receptor (VEGFR) [23,24], targeted therapies like sunitinib, sorafenib, and pazopanib have shown some potential [23]. Sunitinib has demonstrated a modest effect, offering partial tumor shrinkage and stabilization in about half of the patients treated [24]. On the other hand, pazopanib appears to be more effective, particularly in typical SFTs, where a significant number of patients experience either tumor reduction or disease control [25]. However, the benefits in more aggressive tumor forms, such as malignant or dedifferentiated SFTs, are somewhat reduced [25]. Despite the potential of these therapies, severe side effects can limit their use, as seen in our own experience, where treatment discontinuation was necessary in some cases [23,24,25].

Given these limitations, there is a growing interest in alternative treatment modalities that can provide effective tumor control while minimizing systemic toxicity. Since this is a case of liver-only metastatic disease with hypervascular lesions, the option for Selective Internal Radiation Therapy (SIRT) was considered. SIRT is a minimally invasive treatment used for primary and secondary liver cancers, where millions of tiny radioactive resin-based particles, known as SIR-Spheres, are delivered intra-arterially via feeding arteries into liver tumors [26]. These particles release beta radiation, mainly targeting and destroying tumor cells while relatively sparing surrounding healthy tissue [26]. SIRT has proven to be particularly effective for treating inoperable liver tumors, including primary liver cancers such as Hepatocellular Carcinoma (HCC) and metastatic liver tumors from colorectal cancer and neuroendocrine tumors [27]. Clinical studies have shown that SIRT can enhance response rates, improve local tumor control, and, in some cases, extend both progression-free survival (PFS) and overall survival (OS) [28].

Historically, External Beam Radiation Therapy (EBRT) has been widely used for treating unresectable liver metastases [29]. While techniques like Stereotactic Body Radiation Therapy (SBRT) have shown promising results in achieving local control, the treatment poses challenges [30]. Managing respiratory motion, ensuring precision with fiducial markers, and dealing with increased radiation exposure to normal liver tissue are all significant concerns [30,31]. Moreover, multiple treatment sessions are often required, and there are limitations in delivering sufficient radiation doses to larger tumors, making this approach less ideal in some cases [31].

In contrast, Selective Internal Radiation Therapy (SIRT) offers a more targeted approach, delivering higher doses of radiation directly to the tumor through the liver’s arterial supply while sparing surrounding healthy tissue [32]. Studies in patients with non-resectable liver metastases from colorectal cancer have shown that SIRT when combined with chemotherapy, can enhance tumor response and delay disease progression in the liver [33]. SIRT was also tested in combination with sorafenib in patients with advanced hepatocellular carcinoma. The study found no significant improvement in overall survival when SIRT was added to sorafenib compared to using sorafenib alone; however, some subgroups, such as patients without cirrhosis, those with non-alcoholic cirrhosis, and patients under 65, showed potential survival benefits [34].

However, despite its targeted nature, SIRT carries risks, including the potential for unintended radiation exposure to nearby organs like the stomach, pancreas, or lungs, which can result in complications such as pancreatitis or radiation pneumonitis [35]. Careful patient selection, detailed diagnostic evaluations, and precise treatment planning using Tc-99m macroaggregated albumin (Tc-99 MMA) for simulation, followed by accurate delivery of SIR-Spheres, are crucial to minimizing these risks and achieving the best possible outcomes [36].

In this case, we present the novel application of SIRT for treating a metastatic SFT to the liver. We demonstrate significant tumor regression and symptom relief, suggesting that SIRT could provide a viable alternative for SFT patients who are not suitable for surgery or systemic therapy.

SIRT presents a promising avenue for managing SFT and potentially other rare tumors by offering a targeted treatment option with a favorable safety profile. The positive outcome observed in this patient underscores the potential of SIRT to expand the therapeutic landscape for SFT, providing new hope for patients with limited options. Further research is needed to establish the role of SIRT in SFT management and to determine its efficacy and safety in a broader patient population.

Case Presentation

A 73-year-old woman, married with two children and a retired dentist, presented with a medical history notable for hypertension and spinal stenosis at L4-S1. She had undergone a laminectomy in 2017, which did not alleviate her back pain or mobility issues. She had no family history of cancer.

In January 2017, the patient was evaluated for a pelvic mass initially suspected to be an ovarian cyst. She underwent an oophorectomy, during which a highly vascular retroperitoneal para-rectal mass measuring 5 cm was discovered, located to the left of the uterus. A colonoscopy performed that year was unremarkable. In March 2017, she underwent surgery to resect the mass. The histopathological analysis identified the mass as a hemangiopericytoma, which had infiltrated surrounding fat, with positive surgical margins and a high mitotic index.

Further pathological review reclassified the tumor as an SFT, with CD99 and STAT6 positive and CD34 negative, KI67-7%, measuring 7 cm. The patient subsequently received adjuvant radiation therapy to the pelvis, totaling 5040 CGY, completed by June 2017. She was placed under regular follow-up after this treatment.

In the years following her treatment, the patient remained under surveillance. An MRI of the abdomen and pelvis in August 2022 showed no signs of recurrence, and a chest, stomach, and pelvis CT scan in July 2022 was also normal. Additionally, a colonoscopy performed in June 2022 did not reveal any abnormalities. However, an MRI conducted in June 2023 showed several new small hypervascular liver lesions, the largest of which had been seen on previous imaging but was not detected in earlier studies. These findings were initially interpreted as focal nodular hyperplasia (FNH), but a subsequent review by a radiologist raised the suspicion of hypervascular metastases.

A biopsy of one of the liver lesions performed in July 2023 confirmed the presence of metastatic SFT. Genetic testing of the tumor revealed a low mutation burden, Microsatellite instability (MSI) stable status, and a TERT C.124c>T mutation, which has prognostic significance but no direct therapeutic implication. After discussing the treatment options with the patient, which included chemotherapy or TKI therapy, and explaining the benefits, advantages, and disadvantages of each treatment, it was agreed to start therapy with sunitinib.

The patient began treatment with sunitinib at 37.5 mg daily in September 2023. However, after one week, she experienced severe weakness and nausea, leading to the discontinuation of the therapy. The treatment was restarted at a reduced dose of 25 mg daily in October, which was better tolerated. Unfortunately, by mid-November, the patient developed severe side effects, including ulcers on her heels and inguinal area, vaginal burning, joint pain, and peeling of the skin on her hands, consistent with sunitinib toxicity. As a result, the treatment was halted, and she received local supportive care.

In December 2023, a full-body CT scan revealed that two known liver metastases had grown, and a new lesion had appeared near the inferior vena cava (IVC) in the liver. A multi-phase liver CT protocol performed later in December identified five lesions in the right liver lobe and at least one lesion in the left lobe {Figure 1}. After consultation with an interventional radiologist, it was determined that the disease spread pattern was unsuitable for chemoembolization. Still, it was appropriate for Selective Internal Radiation Therapy (SIRT) using Yttrium-90. In February 2024, approximately one week before SIRT treatment, the patient underwent preparatory hepatic catheterization and selective simulation using Tc-99mma, demonstrating the feeding arteries to the liver tumors, and a low lung shunt fraction of 9% was calculated. During this preparatory hepatic catheterization simulation, the arteries feeding the tumors were mapped, optimal catheter location placement for the SIRT treatment was determined {Figure 2}, and the Y90 treatment dose to be delivered was calculated. SIRT treatment was performed successfully with no apparent complications, and the patient was discharged home the next day.

A post-SIRT treatment follow-up PET-CT scan in April 2024 showed no pathological uptake. The previously identified hypervascular liver lesions were absent, and new, ill-defined hypodense changes were observed in both liver lobes, primarily on the right, potentially representing post-SIRT changes {Figure 3}. The interventional radiologist and diagnostic radiologist team reviewed the findings. They confirmed that these changes were consistent with expected post-treatment effects, indicating an excellent response, with the lesions now appearing as cystic cavities.

Discussion

This case illustrates the potential of SIRT as a treatment option for SFT, especially in scenarios where traditional options such as surgery or systemic therapy are not feasible. Although rare, SFTs can pose significant treatment challenges due to their rarity, sluggish behavior, lack of sufficient research, and the limited effectiveness of available systemic therapies [1]. The hypervascular nature of SFTs makes them particularly suitable for SIRT treatment, as this approach leverages the physiologic tumor arterial-based blood supply to deliver high-dose, localized radiation primarily to the tumors while sparing the normal liver tissue, which gains its blood supply mainly from the portal vein [7]. Unlike external beam radiation therapy, which may have limited dosing and precision [30,31], SIRT allows for administering significantly higher radiation doses specifically to the tumor, enhancing the therapeutic effect while minimizing exposure and damage to surrounding healthy tissues [32]. This targeted delivery is especially advantageous in managing hypervascular tumors like SFT, where achieving sufficient radiation doses through traditional methods can be challenging [37]. Performing SIRT as an outpatient procedure offers several advantages, such as improving patient convenience, minimizing hospitalization time, reducing the risk of complications, and lowering overall costs [37]. Furthermore, the option to complete the treatment in a single day could make it particularly attractive for patients who are either unsuitable for or hesitant to undergo more invasive procedures, thereby expanding its utility in managing tumors like SFT [37].

In this patient, SIRT led to significant tumor regression lesions, suggesting that it could be a valuable tool in managing liver-limited SFTs with those that are not suitable for other treatments. The ability of SIRT to deliver targeted radiation while minimizing systemic exposure is especially beneficial for patients who cannot tolerate the side effects of systemic therapies, such as this case, which caused severe toxicity and required discontinuation.

While the positive outcome in this case is encouraging, it is essential to approach these findings cautiously. Further research is needed to explore the broader applicability of SIRT in SFT, including well-designed clinical trials to assess its safety, efficacy, and potential role in the treatment algorithm for this rare tumor.

Given the rarity of SFT and the limited treatment options, it would be valuable to investigate SIRT in a basket trial that includes other rare hypervascular tumors. Such a trial could help define the subsets of patients who may benefit most from this therapy based on tumor biology and disease characteristics. This approach would provide more robust data on the efficacy of SIRT in SFT and contribute to understanding its role in other rare malignancies.

Conclusion

The successful management of SFT with SIRT in this case suggests that it could be a valuable treatment strategy for similar cases, particularly for patients with contraindications to conventional therapies. Further studies are needed to evaluate SIRT’s broader applicability in SFT management.

Author Contributions

Badran O- Conceptualization and wrote the manuscript. Badran O, Dereza S, and Labib M prepared figure illustrations. Badran O, Ziv N, and Bar-Sela G critically reviewed and edited the scientific and structural writing and prepared the manuscript for publication. All authors have read and agreed to the published version of the manuscript.

Ethics Statement

No institutional approval was required to publish the case details.

Consent Statement

The patient gave written informed consent to publish the case report.

Acknowledgments

We want to acknowledge that no funding or financial support was received for the completion or publication of this case report. All efforts were conducted independently.

Abbreviations

SFT	Solitary Fibrous Tumor
CT	Computed Tomography
MRI	Magnetic Resonance Imaging
FDG	Fluorodeoxyglucose
PET	Positron Emission Tomography
TERT	Telomerase Reverse Transcriptase
PFS	Progression-Free Survival
mOS	Median Overall Survival
ORR	Objective Response Rate
SD	Stable Disease
EBRT	External Beam Radiation Therapy
SIRT	Selective Internal Radiation Therapy
HCC	Hepatocellular Carcinoma
SBRT	Stereotactic Body Radiation Therapy
Tc-99 MMA	Technetium-99m Macroaggregated Albumin

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Figure 1. In this abdominal and pelvic CT with contrast performed on 25.12.2023, two hypervascular lesions can be seen, consistent with SFT.

Figure 2. CT angiography image showing contrast injection simulation, highlighting the blood supply to the tumors during the arterial phase.

Figure 3. In this CT scan, dated 30.07.2024, the smaller lesions have disappeared following SIRT treatment, and the dominant lesion has.become hypodense, indicating an inactive metastasis.

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