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Research ArticleClinical Studies

Prognostic Impact of CD44 Expression in Patients With Myxofibrosarcoma

HIROYUKI TSUCHIE, MAKOTO EMORI, NAOHISA MIYAKOSHI, HIROYUKI NAGASAWA, KYOJI OKADA, HIROSHI NANJYO, YASUTAKA MURAHASHI, EMI MIZUSHIMA, JUNYA SHIMIZU, TOSHIHIKO YAMASHITA and YOICHI SHIMADA
In Vivo November 2019, 33 (6) 2095-2102; DOI: https://doi.org/10.21873/invivo.11709
HIROYUKI TSUCHIE
1Department of Orthopedic Surgery, Akita University Graduate School of Medicine, Akita, Japan
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  • For correspondence: tuchikiti@yahoo.co.jp
MAKOTO EMORI
2Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Hokkaido, Japan
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NAOHISA MIYAKOSHI
1Department of Orthopedic Surgery, Akita University Graduate School of Medicine, Akita, Japan
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HIROYUKI NAGASAWA
1Department of Orthopedic Surgery, Akita University Graduate School of Medicine, Akita, Japan
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KYOJI OKADA
3Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita, Japan
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HIROSHI NANJYO
4Department of Pathology, Akita University Graduate School of Medicine, Akita, Japan
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YASUTAKA MURAHASHI
2Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Hokkaido, Japan
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EMI MIZUSHIMA
2Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Hokkaido, Japan
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JUNYA SHIMIZU
2Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Hokkaido, Japan
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TOSHIHIKO YAMASHITA
2Department of Orthopedic Surgery, Sapporo Medical University School of Medicine, Hokkaido, Japan
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YOICHI SHIMADA
1Department of Orthopedic Surgery, Akita University Graduate School of Medicine, Akita, Japan
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Abstract

Background/Aim: Abnormal expression of CD44 may promote cancer invasion. However, a limited number of studies have investigated the expression of CD44 in soft tissue sarcoma such as myxofibrosarcoma. We evaluated the relationship between expression of the standard form of CD44 (CD44s) and the clinical course of myxofibrosarcoma. Materials and Methods: Forty-four myxofibrosarcoma patients were retrospectively enrolled. Patient information including the proportion of CD44s-positive cells was collected, and multivariate analyses were conducted to determine the relationship between CD44s expression and clinicopathological factors. Results: Although CD44s did not affect prognosis, multivariate analysis indicated that high expression of CD44s predicted poor event-free survival (p=0.004) and local recurrence (p=0.049). CD44s expression was not associated with the occurrence of distant metastasis but was significantly higher in those with lung metastasis (p=0.044). Conclusion: Increased expression of CD44s predicted poor event-free survival and local recurrence and was observed in myxofibrosarcoma patients with lung metastasis.

  • Myxofibrosarcoma
  • CD44
  • metastasis
  • prognosis

Myxofibrosarcoma is a common soft-tissue sarcoma found in the extremities of older adults and accounts for approximately 20% of all soft-tissue sarcomas (1). Although complete surgical resection is the standard treatment, negative margins are difficult to obtain, since myxofibrosarcoma has an unusual infiltrative growth pattern along fascial plane (2). Therefore, myxofibrosarcoma outcomes are characterized by high local recurrence rates (15 to 57%), leading to poor overall survival (3-8). In addition, distant metastases of myxofibrosarcoma are common. In particular, lung metastasis greatly affects prognosis (9). Although some factors associated with local recurrence, such as resection with positive or close margins and bone and joint involvement, have been examined in many studies, little is known regarding pre-existing factors that facilitate local recurrence or distant metastasis (3-5, 7, 8).

Cell-cell and cell-matrix interactions are essential for normal cell growth and differentiation, and a variety of adhesion molecules participate in these interactions, including the hyaluronic acid binding transmembrane glycoprotein CD44. The standard form of CD44 (CD44s) and its variants are ubiquitously expressed on all cell types, where they act as receptors for hyaluronic acid. CD44 plays various roles and is involved in cellular differentiation, cellular migration, and cell-cell contact (10). Therefore, abnormal expression of CD44 in cancer and sarcoma cells may promote invasion and lead to local recurrence and distant metastases, ultimately affecting prognosis. Previous studies have reported the association between abnormal expression of CD44 and tumor growth or more aggressive behavior in various cancers, such as breast, gastric, colorectal, and lung cancer (11-14). However, relatively few studies have investigated the expression of CD44 in soft tissue sarcoma, with even fewer reports on myxofibrosarcoma (15-22).

The present study aimed to investigate the relationship between expression of CD44s and the clinical course of myxofibrosarcoma, such as prognosis, local recurrence, and distant metastasis.

Patients and Methods

Subjects. Sixty patients with myxofibrosarcoma were treated at Akita University Hospital and Sapporo Medical University Hospital between 1992 and 2017. Among these, 44 consecutive patients who had sufficient medical records and tissue was available for pathological re-evaluation were included (19 males and 25 females; mean age, 72 years). Patient information, including age, sex, anatomical location, size of the tumor, proportion of CD44s-positive cells, metastasis at diagnosis, stage of the primary tumor, local and distant relapse, follow-up period, and outcome, was collected. Primary tumor stage was determined according to the staging system of the American Joint Committee on Cancer (AJCC), 7th edition (23). Specimens were classified according to the French Federation of Cancer Center Sarcoma Group (FNCLCC) system, which is based on mitotic index, necrosis extension, and histological differentiation of the tumor (24).

We examined factors influencing prognosis, event-free survival (EFS), local recurrence, and distant metastasis. The local recurrence-free survival and distant metastasis-free survival were defined as the time period for which patients remained free of local recurrence or distant metastasis after the primary tumor had been resected. EFS was defined as the time period for which patients remained free of local recurrence and distant metastasis after the primary tumor had been resected, and overall survival (OS) was defined as the time period from the date of diagnosis to that of death or the last follow-up. In the absence of any events, the date of the last follow-up was considered the end point. Since no deaths were reported due to postoperative complications in this study, patients who died from the original disease were considered to have died of disease (DOD). Cases were regarded to have had a surgical indication if all lesions, including distant metastases, could have been excised and if general anesthesia could have been administered by an anesthesiologist.

In patients with distant metastasis, we compared the expression of CD44s between individuals with lung metastasis (lung group) and those with lymph node metastasis (lymph node group).

This study was approved by the Institutional Review Board for Clinical Research at Akita university (approval number: 1794), and informed consent was obtained from all patients enrolled in the study.

Immunohistochemistry for CD44s. To evaluate the expression of CD44s, immunohistochemical staining was conducted on formalin-fixed paraffin-embedded sections from 44 myxofibrosarcoma patients who underwent biopsy or resection, as previously described (25), using anti-CD44s antibody (dilution 1:800; Clone #691534; R&D Systems, Minneapolis, MN, USA). CD44s expression was quantified by two independent observers who were blinded to patient outcome, and the average of their measurements was used. A tumor was considered positive if staining was confined to the cell membrane or the cytoplasm in the absence of significant background staining. Ten randomized regions of interest (ROI) (size, 250 μm × 370 μm each) were analyzed in the tumor, and the proportion of CD44s-positive cells was calculated and expressed as a percentage of total cells (26).

Statistical analysis. All continuous variables were expressed as means±standard deviations (SD). A Cox proportional hazards model was used to identify the factors associated with OS, EFS, local recurrence, and distant metastasis. Student's t-tests, Welch t-tests, and Chi squared (χ2) tests were used to compare characteristics between the lung and lymph node groups. Results with p-values less than 0.05 were considered significant.

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Table I.

Clinical information for 44 patients with myxofibrosarcoma.

Results

Patient demographic and clinicopathological information is shown in Table I. Metastasis at diagnosis was observed in the lung in one patient. According to the AJCC staging system, 3 (6.7%), 7 (15.9%), 11 (25.0%), 12 (27.3%), 10 (22.7%), and 1 (2.5%) patients were classified as having stages IA, IB, IIA, II B, III, and IV, respectively. All patients treated with chemotherapy received doxorubicin and ifosfamide. Immunohistochemical staining using anti-CD44s antibody showed both membranous and cytoplasmic staining (Figure 1). The CD44s-positive cell rate was 34.6±20.4%. Eighteen of 44 patients (40.9%) developed distant metastasis, including 12/18 patients (66.7%) with pulmonary metastases, and 6/18 with lymph node metastases. Among these 18 patients, there were one patient each with distant metastasis to bone, subcutaneous, intramuscular, and peritoneum involvement. No patient died of complications during the perioperative period. Radiotherapy was conducted in nine patients (20.5%). Among these nine patients, heavy particle irradiation was conducted in one patient, and four of them received radiotherapy after surgical treatment because of insufficient surgical margin. The remaining four were irradiated for the purpose of local control since they did not wish to undergo surgical treatment or had difficulty in radical resection. Chemotherapy was administered to a total of three patients (6.8%), and all of them were patients with distant metastasis.

Figure 1.
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Figure 1.

Representative images of immunostaining for CD44s. Original magnification, ×400.

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Table II.

Univariate and multivariate analysis of factors affecting event-free survival and prognosis.

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Table III.

Univariate and multivariate analysis of factors affecting local recurrence-free survival and distant metastasis-free survival.

In the univariate analysis to investigate factors associated with prognosis, older age and advanced stage were identified as risk factors for poor prognosis. Upon multivariate analysis, only older age was identified as a risk factor for poor prognosis (p=0.012) (Table II). Upon univariate and multivariate analyses to investigate factors associated with EFS, advanced stage and high expression of CD44s predicted poor EFS (p=0.010 and 0.004, respectively) (Table II). In the univariate analysis to investigate factors associated with local recurrence, only high expression of CD44s was associated with local recurrence (p=0.006) (Table III). In the univariate analysis, older age and trunk development were risk factors for distant metastasis, but no significant association was observed in the multivariate analysis (Table III). When we sub-analyzed solely the patients who received surgical treatment with adequate margin to accurately evaluate the relationship between CD44s and local recurrence, we found that high expression of CD44s was associated with local recurrence in the univariate analysis (p=0.010) (Table IV).

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Table IV.

Univariate analysis of factors affecting local recurrence-free survival only in patients who received surgical treatment with adequate margin.

Among the patients with distant metastasis, the proportion of CD44s-positive cells in the lung group (41.9±26.9) was significantly higher than that in the lymph node group (23.7±8.1) (p=0.049). Similarly, the time from initial presentation to development of distant metastasis in the lung group (9.8±7.0 months) was significantly shorter than that in the lymph node group (36.2±19.5 months) (p=0.024). Moreover, outcomes in the lung group were significantly poorer than those in the lymph node group (p=0.005) (Table V).

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Table V.

Univariate logistic regression analysis of lung and lymph node groups.

Discussion

CD44 is involved in cellular differentiation and migration, and abnormal expression of CD44 in cancer and sarcoma cells may promote invasion and lead to local recurrence and distant metastases (11-22). In the present study, enhanced expression of CD44s was found to be a poor prognostic factor for local recurrence. In addition, the overall expression rate of CD44s in all patients was relatively high. Myxofibrosarcoma is a soft tissue sarcoma prone to local recurrence, and the expression of CD44s may have a major influence on its local infiltration. Prior to resection, if expression of CD44s is found to be elevated in the biopsy tissue, care should be taken when resecting the tumor with a sufficient margin, which may improve the prognosis of myxofibrosarcoma.

Conflicting results regarding the expression of CD44 in sarcoma have been reported. Although poor prognosis is associated with the overexpression of CD44v6, a variant form of CD44, discrepant results have been reported for CD44s (15-22, 27-34). Some studies of various types of soft tissue sarcoma have reported that high expression of CD44, including both standard and unknown forms, is likely to have adverse effects on prognosis, distant metastasis, and local recurrence, whereas other studies have reported good prognosis in patients with increased CD44s expression (15-22). In terms of specific histological types of sarcoma, good prognosis is associated with the overexpression of CD44 in rhabdomyosarcoma (21). In contrast, no apparent association was observed between prognosis and CD44 expression in synovial sarcoma (22). To date, only one study has examined the relationship between CD44 expression and prognosis in patients with myxofibrosarcoma. Tumor tissues of 34 patients with myxofibrosarcoma were analyzed by PCR, and good prognosis was associated with increased CD44s and decreased CD44v6 expression (17). However, in this prior study, only CD44 expression and survival time were evaluated. Since various clinical factors, such as age, location, and tumor size, can also affect prognosis, it is necessary to analyze these factors together when examining the relationship between CD44 expression and prognosis. In our current study, we examined several factors that may affect prognosis. Consequently, we found that CD44s expression did not affect OS. However, increased CD44s expression was a risk factor for shorter EFS, and local recurrence. Our results thus differ somewhat from those of the earlier study.

A relatively large number of studies have been conducted on the expression of CD44 in malignant bone tumors, particularly osteosarcoma (27-33). In studies involving osteosarcoma, poor prognosis, as well as frequent distant metastasis and local recurrence, have been found to be associated with the overexpression of CD44s (30-32). In addition, in chondrosarcoma, poor prognosis was observed in patients with elevated CD44s (34). There has been only one report in which CD44s was not associated with the prognosis of patients with osteosarcoma (33), and there have been no reports showing a good prognosis in osteosarcoma patients with elevated CD44s. Although the relationship between CD44s and prognosis in our study differed from that of previous studies, our results are credible when considering past reports on various sarcomas.

The lung is generally thought to be the most frequent organ involved in the metastasis of soft tissue sarcoma. However, we have reported, in a previous study, that lymph node metastasis is also relatively frequent in patients with myxofibrosarcoma (9). In this study, various factors between patients with lung and lymph node metastasis were compared. Our results showed that the onset of lymph node metastasis was later than that of lung metastasis and that the prognosis of lymph node metastasis patients was better than that of lung metastasis patients. However, in our previous study, we were unable to identify factors associated with these clinical features (9). In the current study, CD44s expression was evaluated in patients with distant metastasis and found that CD44s expression was significantly elevated in patients with lung metastasis compared with that in patients with lymph node metastasis. He et al. have reported that the expression of CD44 was elevated in patients with lung metastasis of osteosarcoma (31). This is similar to the results of our study, indicating that the upregulation of CD44s may be a risk factor for pulmonary metastasis.

Aside from CD44, few reports have examined cell surface markers that affect the prognosis of myxofibrosarcoma. CD109 is a monomeric 170-kDa cell surface glycoprotein that is a TGF-β co-receptor, regulating TGF-β receptor endocytosis and degradation (35). Increased expression of CD109 has been reported to be a poor prognostic factor for myxofibrosarcoma (36).

One of the main limitations of this study was the inclusion of a relatively small number of myxofibrosarcoma patients. Since only a few patients underwent chemotherapy and radiotherapy, the number of patients was limited, and thus, it was difficult to strictly evaluate detailed treatment. Additionally, CD44s expression in the lung metastasis patients was found to be higher than that in the lymph node metastasis patients. However, expression of CD44s was not determined as a factor affecting OS, and the small number of patients may have influenced this conflicting result. Although the number of cases in the present study was larger than that of a previous study evaluating CD44 expression in myxofibrosarcoma (21), more cases are needed for a comprehensive multivariate analysis of the various factors affecting prognosis.

The present study demonstrates that increased expression of CD44s is a risk factor for shorter EFS and local recurrence. In addition, expression of CD44s was significantly elevated in patients with lung metastasis. However, CD44s expression was not a predictor of OS. More detailed studies on the influence of CD44 expression on prognosis and distant metastasis of myxofibrosarcoma are necessary in the future.

Footnotes

  • Authors' Contributions

    All Authors were involved in the planning and revising for this research; Tsuchie H, Nagasawa H, Emori M, Murahasi Y, Mizushima E, and Shimizu J collected the clinical data; Emori M and Nanjyo H made a preparation for immunostaining; Nanjyo H and Okada K evaluated immunostaining; Tsuchie H analyzed the raw data; Tsuchie H wrote this dissertation; Miyakoshi N, Yamashita Y, and Shimada Y reviewed this dissertation.

  • This article is freely accessible online.

  • Conflicts of Interest

    The Authors have no conflicts of interest to declare regarding this study.

  • Received July 31, 2019.
  • Revision received August 12, 2019.
  • Accepted August 14, 2019.
  • Copyright© 2019, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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In Vivo: 33 (6)
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Vol. 33, Issue 6
November-December 2019
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Prognostic Impact of CD44 Expression in Patients With Myxofibrosarcoma
HIROYUKI TSUCHIE, MAKOTO EMORI, NAOHISA MIYAKOSHI, HIROYUKI NAGASAWA, KYOJI OKADA, HIROSHI NANJYO, YASUTAKA MURAHASHI, EMI MIZUSHIMA, JUNYA SHIMIZU, TOSHIHIKO YAMASHITA, YOICHI SHIMADA
In Vivo Nov 2019, 33 (6) 2095-2102; DOI: 10.21873/invivo.11709

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Prognostic Impact of CD44 Expression in Patients With Myxofibrosarcoma
HIROYUKI TSUCHIE, MAKOTO EMORI, NAOHISA MIYAKOSHI, HIROYUKI NAGASAWA, KYOJI OKADA, HIROSHI NANJYO, YASUTAKA MURAHASHI, EMI MIZUSHIMA, JUNYA SHIMIZU, TOSHIHIKO YAMASHITA, YOICHI SHIMADA
In Vivo Nov 2019, 33 (6) 2095-2102; DOI: 10.21873/invivo.11709
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Keywords

  • Myxofibrosarcoma
  • CD44
  • metastasis
  • prognosis
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