• Journal of Korean Neurosurgical Society
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• 제65권2호
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• pp.297-306
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• 2022

Objective : Intracranial atypical meningiomas have a poor prognosis and high rates of recurrence. Moreover, up to one-third of the recurrences undergo high-grade transformation into malignant meningiomas. We aimed to investigate the clinical factors that can predict the propensity of malignant transformation from atypical to anaplastic meningiomas. Methods : Between 2001 and 2018, all patients with atypical meningioma, in whom the tumors had undergone malignant transformation to anaplastic meningioma, were included. The patients' medical records documenting the diagnosis of atypical meningioma prior to malignant transformation were reviewed to identify the predictors of transformation. The control group comprised 56 patients with atypical meningiomas who were first diagnosed between January 2017 and December 2018 and had no malignant transformation. Results : Nine patients in whom the atypical meningiomas underwent malignant transformation were included. The median time interval from diagnosis of atypical meningioma to malignant transformation was 19 months (range, 7-78). The study group showed a significant difference in heterogeneous enhancement (77.8% vs. 33.9%), bone invasion (55.6% vs. 12.5%), mitotic index (MI; 14.8±4.9 vs. 3.5±3.9), and Ki-67 index (20.7±13.9 vs. 9.5±7.1) compared with the control group. In multivariate analysis, increased MI (odds ratio, 1.436; 95% confidence interval, 1.127-1.900; p=0.004) was the only significant factor for predicting malignant transformation. Conclusion : An increased MI within atypical meningiomas might be used as a predictor of malignant transformation. Tumors at high risk for malignant transformation might require more attentive surveillance and management than other atypical meningiomas.

• International Journal of Oral Biology
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• 제45권1호
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• pp.1-7
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• 2020

Oral lichen planus (OLP) is a chronic inflammatory disease observed in approximately 0.5-2.2% of the population, and it is recognized as a premalignant lesion that can progress into oral squamous cell carcinoma (OSCC). The rate of malignant transformation is approximately 1.09-2.3%, and the risk factors for malignant transformation are age, female, erosive type, and tongue site location. Malignant transformation of OLP is likely related to the low frequency of apoptotic phenomena. Therefore, apoptosis-related genetic factors, like p53, BCL-2, and BAX are reviewed. Increased p53 expression and altered expression of BCL-2 and BAX were observed in OLP patients, and the malignant transformation rate in these patients was relatively higher. The involvement of microRNA (miRNA) in the malignant transformation of OLP is also reviewed. Because autophagy is involved in cell survival and death through the regulation of various cellular processes, autophagy-related genetic factors may function as factors for malignant transformation. In OLP, decreased levels of ATG9B mRNA and a higher expression of IGF1 were observed, suggesting a reduction in cell death and autophagic response. Activated IGF1-PI3K/AKT/mTor cascade may play an important role in a signaling pathway related to the malignant transformation of OLP to OSCC. Recent research has shown that miRNAs, such as miR-199 and miR-122, activate the cascade, increasing the prosurvival and proproliferative signals.

• Asian Pacific Journal of Cancer Prevention
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• 제14권8호
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• pp.4693-4697
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• 2013

Background: Malignant transformation arising in mature cystic teratoma (MCT) is one of the most serious complications of MCT. Squamous cell carcinoma is the most common malignant change. Some clinical findings such as advanced age group and large tumor size are significant risk factors of malignant transformation. This study was conducted in order to evaluate characteristics, cell types, treatment and outcome of malignant transformation arising from dermoid cysts in our institution. Materials and Methods: A retrospective chart review was performed. General characteristics, operative data, procedure, operative finding and operative outcome were analyzed. Statistical assessment was performed with SPSS version 17.0, using mean, mode, median and percentage to describe those data. Results: During the 10 years period, 11 cases of malignant transformation from a total of 753 cases (1.46% incidence) of MCT were reviewed. Mean age of the patients was 41.2 years (SD 4.34, range 24-70). The most common presenting symptom was a palpable mass (8 cases; 72.7%). Primary surgical staging was performed in 4 patients (36.4%). Re-staging was conducted in the other 4. Complete cytoreduction was obtained in 45.5% (5 cases) and optimal surgical resection was obtained in 36.4% (4 cases). Mean tumor size was 14.1 cm. (SD 1.55, range 6-20). Squamous cell carcinoma was found in 36.4% (4 cases) and mucinous cancer in the other 4. More than half of them were stage Ia (54.5%, 6 cases). All patients whose stage more than Ia received chemotherapy (45.5%). Mean disease free survival was 5.53 years (1.32, 0.3-10). Conclusion: According to our study, the incidence of malignant transformation was consistent with previous studies. The common malignant transformation histologic types are both squamous and mucinous carcinoma which differed from previous reports. Early detection for early stage disease and optimal surgery are important for long term survival.

• Journal of Korean Neurosurgical Society
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• 제37권5호
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• pp.383-385
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• 2005

Malignant transformation of fibrous dysplasia is a rare condition and the incidence is estimated at 0.4% for fibrous dysplasia and 4% for Albright's syndrome. The authors did not find a reported case of malignant change at skull base around the orbit in the literature. We experienced a case of fibrous dysplasia, in which neurologic symptoms were aggravated due to malignant change around the orbit, and report its favorable outcome obtained with total surgical removal.

• Journal of Korean Neurosurgical Society
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• 제30권4호
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• pp.514-517
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• 2001

Although malignant transformation of meningiomas has been reported, it is extremely rare in meningiomas of ventricular system. Less than 2% of all meningiomas show malignant transformation from benign meningioma. We report a case of meningioma with early recurrence and malignant transformation and investigated possible underlying factors using immunohistochemistry for PCNA and p53 protein expression.

• Journal of Korean Neurosurgical Society
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• 제60권1호
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• pp.108-113
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• 2017

Craniopharyngiomas exhibiting histologic malignancy are extremely rare. Herein, we report the case of a 26-year-old male patient who underwent suprasellar mass excision via an interhemispheric transcallosal approach. Histopathological examination indicated that the craniopharyngioma was of the adamantinomatous subtype. The patient received postoperative medical treatment for endocrine dysfunction and diabetes mellitus without radiation treatment. Two years after the operation, he presented with progressive visual disturbance and altered mentality. Magnetic resonance imaging revealed a huge mass in the suprasellar cistern and third ventricle. He underwent a second operation via the same approach. The histopathological examination showed an adamantinomatous craniopharyngioma with sheets of solid proliferation in a spindled pattern, indicating malignant transformation. Malignant transformation of craniopharyngioma in the absence of radiation therapy has been reported in only five cases, including this one. We present a case of malignant transformation of craniopharyngioma with a brief review of relevant literature.

• 대한골관절종양학회지
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• 제13권2호
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• pp.167-172
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• 2007

거대 세포종(GCT)의 악성화 (malignant transformation)는 매우 드문 것으로 알려져 있다. 주로 악성화는 방사선 치료 후 발생하는 것으로 보고 되고 있으며, 방사선 치료 없이 악성화 하는 경우는 더욱 더 드물게 보고 되고 있다. 방사선 소견만으로는 진단하기 어려우며, 병리학적 진단 또한 종종 쉽지 않은 경우가 있다. 예후가 매우 불량하여 신속한 진단을 통해 공격적 치료를 조기에 시행하는 것이 매우 중요하다. 저자들은 최초에 거대 세포종으로 진단되었다가 재발 후 골육종으로 악성 전환된 증례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.

• Journal of Yeungnam Medical Science
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• 제34권2호
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• pp.298-302
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• 2017

Glandular papilloma of the lung is one of three histologic types of solitary endobronchial papillomas. It is known as an uncommon benign neoplasm. No malignant glandular papillomas have been reported. Herein, the first case of granular papilloma with malignant transformation is reported. A 74-year-old man with huge right lung mass extended upper and lower lobe was admitted to the hospital complaining of progressive cough and dyspnea. An open lung biopsy was performed. Microscopically, the tumor showed papillary growth pattern with thick fibrovascular cores. The stroma of the fibrovascular cores shown the infiltration of lymphoplasmacytic cells and proliferation of capillaries. The epithelial cells surrounding the papillary fronds were cilliated columnar cells with focal cellar atypia, and frequent mitoses. Suspicious pleural invasion foci were identified. The Ki-67 labeling index was about 24.3% and p53 labeling index was about 31.7%. Glandular papilloma is known as a benign neoplasm, which is lack of atypia and mitosis. In present case, there were several indications of malignant transformation, such as cellular atypia, frequent mitosis, architectural distortion, and pleural invasion. Pathologists must be aware that glandular papilloma can have a changes of malignant transformation. Further studies about disease behavior and molecular characteristics are needed.

• 동의생리병리학회지
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• 제24권6호
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• pp.1059-1061
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• 2010

Mature cystic teratoma is a common ovarian lesion, approximately 10-20% of ovarian tumor. However, it can undergo a malignant transformation, but incidence of malignant transformation is very low. Squamous cell carcinoma is the most common type of malignant transformation in the mature cystic teratoma. Preoperative diagnosis of malignant transformation in the mature cystic teratoma is very difficult, because malignant transformed tissues are very small in the mature cystic teratoma components. And so most of the carcinoma arising in mature cystic teratoma were diagnosed after histologic examination. We experienced a case of squamous cell carcinoma arising in the mature cystic teratoma of the ovary and report a case with a brief review of the literatures.

• 대한골관절종양학회지
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• 제8권1호
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• pp.12-19
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• 2002

목적 : 거대 세포종이 방사선 조사 없이 악성 전환하는 것은 매우 드문 경우로 저자들이 경험한 4례를 분석하여, 흔하지 않은 악성 전환된 거대 세포종의 진단과 치료의 방침을 제시하는데 도움이 되고자 한다. 대상 및 방법 : 1985년 9월부터 2001년 1월까지 본원 정형외과에 내원하여, 수술적 치료를 시행했던 거대 세포종 112례 중 방사선 조사 없이 악성화한 4례를 대상으로 하였으며, 악성전환 후 평균 추시 기간은 2.4년(최저 1.3년, 최고 4년)이었다. 결과 : 거대 세포종의 진단 후 악성 전환 때까지의 기간은 평균 6.9년(최저 2.2년, 최고 13.5년)이었고, 근위 상완부 연부 조직, 근위 대퇴골, 원위 대퇴골, 근위 경골에 각각 1례씩 발생하였다. 3례에서는 골 육종으로, 1례에서는 악성 섬유성 조직구종으로 악성 전환이 일어났으며, 국소 재발은 1례, 폐 전이는 골 육종으로 악성 전환한 3례에서 모두 관찰되었다. 결론 : 방사선 조사 없이 속발한 거대 세포종의 악성 전환을 진단하기 위해서는 병리 조직의 철저한 채취가 매우 중요한 요소라 사료되며, 방사선 소견상 악성 전환이 의심될 때는 부적절한 절제술을 시행하기보다는 절개 생검을 먼저 시행한 후 치료 방침을 정해야 할 것으로 사료된다.