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Rhabdoid Colorectal Carcinomas: Reports of Two Cases
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Case Study
Rhabdoid Colorectal Carcinomas: Reports of Two Cases
Sang Hwa Lee, Hyesil Seol1, Wook Youn Kim1, So Dug Lim1, Wan Seop Kim1, Tae Sook Hwang1, Hye Seung Han1
Korean Journal of Pathology 2013;47(4):372-377.
DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.4.372
Published online: August 26, 2013

Department of Pathology, Research Center, Aerospace Medical Center, Republic of Korea Air Force, Cheongju, Korea.

1Department of Pathology, Konkuk University School of Medicine, Seoul, Korea.

Corresponding Author: Hye Seung Han, M.D. Department of Pathology, Konkuk University School of Medicine, 120-1 Neungdong-ro, Gwangjin-gu, Seoul 143-729, Korea. Tel: +82-2-2030-5644, Fax: +82-2-2030-5629, 'aphsh@kuh.ac.kr'
• Received: August 20, 2012   • Revised: September 24, 2012   • Accepted: October 8, 2012

© 2013 The Korean Society of Pathologists/The Korean Society for Cytopathology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Rhabdoid colorectal carcinomas are very rare and only 10 cases have been previously reported. We report two cases of rhabdoid colorectal carcinoma, one arising in the sigmoid colon of a 62-year-old man and another in the rectum of an 83-year-old woman. In both cases, the patients had advanced tumors with lymph node metastases. The tumors mostly showed a diffuse arrangement with rhabdoid features and small glandular regions were combined. Transitional areas from the adenocarcinomas to the rhabdoid tumors were also noted. Adenocarcinoma cells were positive for mixed cytokeratin (CK), CK20 and epithelial membranous antigen (EMA), but focal positive for vimentin. The rhabdoid tumor cells were positive for mixed CK, but focal positive or negative for CK20 and EMA. In addition, they were diffusely positive for vimentin, but negative for desmin. The histological and immunohistologial findings of these two cases suggest that the rhabodid tumor cells originated from dedifferentiated adenocarcinomas.
Malignant rhabdoid tumor was first described in 1978 as a rare variant of Wilms tumor.1 This neoplasm was morphologically similar to rhabdomyoblast and had an extremely poor prognosis. Now it is known as malignant renal rhabdoid tumor, which is a distinct clinicopathologic entity from Wilms tumor.2 Tumors with similar clinicopathologic features have been reported in various extrarenal organs. Although these tumors, known malignant extrarenal rhabdoid tumors (MERTs), were reported to be as aggressive as their renal counterparts, the existence of MERTs as an independent disease entity remains controversial.3-5 Colorectal MERTs are very rare, with only 10 cases reported to date.6-15 Among these reports, six cases were pure rhabdoid tumors solely consisting of rhabdoid cells,6-11 and four cases were composite rhabdoid tumors coexisting with adenocarcinomas.12-15 Here, we describe two new cases of colorectal rhabdoid carcinomas arising in the sigmoid colon and rectum, and review the previously reported cases.
Case 1
A 62-year-old man was admitted to Konkuk University Medical Center due to occult blood in his stool. He had a six-year history of hypertension and cerebrovascular attacks. Colonoscopic examination revealed a huge mass in the sigmoid colon. Abdominal computed tomography (CT) revealed an ulcerofungating mass in the sigmoid colon and multiple enlarged pericolic lymph nodes. There was no evidence of distant metastasis on chest CT and positron emission tomography-computed tomography (PET-CT). The serum level of cancer antigen 19-9 (CA19-9) was within the normal range (15.75 U/mL). Low anterior resection was performed on a 4.5×4.0×1.2 cm sized ulcerofungating mass in the sigmoid colon (Fig. 1). Microscopically, most of the tumor was composed of sheets of large round and polygonal nuclei with vesicular chromatin along with abundant acidophilic cytoplasm which often contained hyaline-like inclusions. A poorly differentiated adenocarcinoma component was found in the peripheral portion of the tumor, located in the mucosa and submucosa, taking up 5% of the tumor. A transitional area from the poorly differentiated adenocarcinoma to the rhabdoid tumor was noted (Fig. 2). The tumor invaded into the pericolic adipose tissue and 10 out of 24 regional lymph nodes showed metastases. Adenocarcinoma cells were positive for mixed cytokeratin (CK), CK20, and epithelial membranous antigen (EMA), but focally positive for vimentin (Fig. 2). The rhabdoid tumor cells were positive for mixed CK, but focally positive for CK20 and EMA. In addition, the rhabdoid tumor cells were diffusely positive for vimentin, but negative for desmin (Fig. 2). E-Cadherin immunoreactivity was attenuated in the adenocarcinoma cells and negative in the rhabdoid tumor cells (Fig. 2). Immunohistochemical stains for MLH1, MSH2, MSH6, and PMS2 were positive in both types of tumor cells, while the stains for p53 were negative in both types of tumor cells. Immunohistochemical stains for smooth muscle actin (SMA), CD45, CD99, CD117, synaptophysin, neuron-specific enolase (NSE), and human melanoma black 45 (HMB45) were also negative in both types of tumor cells. The patient was treated with 12 cycles of adjuvant chemotherapy (FOLFOX: folinic acid, fluorouracil, oxaliplatin) and was alive without evidence of recurrence or distant metastasis for 36 months after surgery.
Case 2
An 83-year-old woman with a history of hypertension was admitted to Konkuk University Medical Center for the further evaluation of rectal cancer. Colonoscopic examination revealed a huge mass in the rectum. Abdominal, chest CT and PET-CT revealed an ulcerofungating mass in the rectum with multiple metastatic lesions in the liver, lung, perirectal, para-aortic and left common iliac lymph nodes. The serum level of CA19-9 was elevated (60.50 U/mL). Lower anterior resection was performed. The tumor was an ulcerofungating mass, measuring 6.5×4.3×4.0 cm, in the rectum (Fig. 1). Microscopically, the tumor composed of sheets of rhabdoid cells, which comprised 70% of the tumor. The remaining portion of the tumor consisted of gland forming adenocarcinoma cells with villous adenoma. The tumor invaded into the mesosalpinx. Although there was no metastasis in 7 regional lymph nodes, 4 out of 4 omental lymph nodes showed metastases. Adenocarcinoma cells were positive for mixed CK, CK20, and EMA, but focal positive for vimentin (Fig. 3). The rhabdoid tumor cells were positive for mixed CK, but negative for CK20 and EMA. In addition, the rhabdoid tumor cells were diffusely positive for vimentin, but negative for desmin (Fig. 3). E-Cadherin immunoreactivity was attenuated in the adenocarcinoma cells and negative in the rhabdoid tumor cells. Immunohistochemical stains for MLH1, MSH2, MSH6, and PMS2 were positive in both types of tumor cells, while the stains for p53 was negative in the adenocarcinoma cells and focal positive in the rhabdoid tumor cells. Immunohistochemical stains for SMA, CD45, CD99, CD117, synaptophysin, and HMB45 were negative in both types of tumor cells, while the stains for NSE was weakly positive in the rhabdoid tumor cells. Unfortunately, the patient died a month after surgery.
MERT is characterized by the peculiar morphologic features of the proliferating rhabdoid cells, which show an eccentrically located large nucleus with prominent nucleoli and a typical eosinophilic inclusion of aggregated intermediate filaments.16 Although Beckwith and Palmer,1 who described the first case, considered the neoplasm an unusual form of rhabdomyoid sarcoma, there was no ultrastructural or immunohistochemical evidence of myogenic differentiation, so the term "rhabdoid tumor" was adopted.1 Although the histogenesis of rhabdoid tumors is unknown, all reported cases share similar histological, immunohistochemical, and ultrastructural findings.3 The ultrastructural findings of the reported cases showed that the rhabdoid cells had eccentric nuclei containing prominent nucleoli and paranuclear inclusions composed of intermediate filaments of the mesenchymal cytoskeleton.8,9,12,13 Although the percentage of tumor cells with a rhabdoid morphology that are needed in a carcinoma to constitute a composite rhabdoid tumor is still up for debate, the percentage of rhabdoid tumor cells in previously reported cases have been greater than 60%.10,17 The percentage of rhabdoid tumor cells in cases 1 and 2 were 95% and 70%, respectively. Six cases of colorectal MERTs coexisting with adenocarcinoma, including the two cases presented here, suggest that the rhabdoid cells might have been derived from sarcomatous dedifferentiation of malignant epithelial cells.12 The rhabdoid cells in the pure rhabdoid tumors and those in the adenocarcinomas with rhabdoid phenotypes both showed similar morphologic features and immunohistochemical results (Table 1).6-13 In the present cases, the transition from the adenocarcinoma to the rhabdoid cells was noted. Adenocarcinoma cells were positive for mixed CK, CK20, and EMA, but focal positive for vimentin. The rhabdoid tumor cells were positive for mixed CK, but focal positive (case 1) or negative (case 2) for CK20 and EMA. In addition, the rhabdoid tumor cells were diffusely positive for vimentin, but negative for desmin. These results suggest that the rhabdoid tumor cells might have originated from dedifferentiated adenocarcinomas. E-Cadherin is a transmembrane protein confined to epithelial cells and is mainly responsible for the adherence junctions between them. In colon cancer, E-cadherin reduction appears to be associated with dedifferentiation, invasion, metastasis, and poor prognoses.18 In the two cases presented here, E-cadherin immunoreactivity was attenuated in the adenocarcinoma cells and negative in the rhabdoid tumor cells. These results also suggest that the rhabdoid tumor cells might have originated from dedifferentiated adenocarcinomas.
Colorectal MERTs are very rare and only 10 cases have been reported to date. These cases, as well as the cases presented here, are summarized in Table 2. The majority of MERTs usually occur in childhood, while colorectal MERTs occur in elderly patients. Many of these tumors have been reported to be huge and located proximal to the transverse colon, with extremely poor prognosis.6-15 Colorectal MERTs, including the cases presented here, affect older patients (mean age, 71.3 years; age range, 62-84 years) with no sex preference (male:female ratio=1:1). Of the 10 reported cases, 8 cases were located proximal to the transverse colon. The tumor sizes ranged between 3-15 cm in the largest diameter (mean size, 8.5 cm). Like other MERTs, MERTs of the gastrointestinal tract are rather aggressive and over 75% of the patients die within 6 months following the initial diagnosis.19 In the reported colorectal MERTs, 8 out of 10 patients died within 8 months following the initial diagnosis and Pancione et al.11 and Remo et al.15 reported that adjuvant chemotherapy had no significant benefits. One of the cases presented here also showed an extremely poor prognosis, although the patient in the other case responded to adjuvant chemotherapy and was alive without evidence of recurrence or distant metastasis for 36 months after surgery.
Microsatellite instability (MSI) and p53 gene mutation are two major genetic abnormalities in colorectal cancers. Approximately 15% of all colorectal tumors have MSI and 75-80% of the tumors in this group have the acquired methylation of MLH1.20 MSI-high colorectal tumor are frequently observed in adenocarcinomas of the right sided colon, especially the cecum, of elderly patients.20 Of 10 reported cases, two cases were MSI-high tumors located at the cecum.11,15 One case was a MSI stable tumor13 and the MSI analysis results were not described in the remaining 7 cases. Immunohistochemical analysis of MLH1, MSH2, MSH6, and PMS2 proteins was equivalent in the levels of sensitivity and specificity compared with the MSI analysis.16 The two cases presented here all showed positive immunoreactivity for MLH1, MSH2, MSH6, and PMS2, and therefore might be MSI-stable tumors. There is a possibility that these two MSI-high tumors might not be associated with rhabdoid features but instead are associated with their right side colonic locations. The overexpression of the p53 protein, suggesting mutation of the p53 gene, was noted in four out of the 10 reported cases.7,8,11,13 In the remaining 6 cases, p53 protein results were not described. Kono et al.13 suggested a very restricted role of p53 mutations in the rhabdoid dedifferentiation of adenocarcinoma cells, because p53 protein was not observed in any of the adenocarcinoma cells and was noted in only a small subset of the rhabdoid tumor cells. We found similar p53 protein expression in case 2.
We described two new cases of rhabdoid colorectal carcinoma arising in the sigmoid colon and rectum and reviewed the previously reported cases. Histological and immunohistologial findings of these two cases suggested that the rhabodid tumor cells originated from dedifferentiated adenocarcinoma. These tumors showed no relationship with MSI. However, p53 protein overexpression in a small subset of the rhabdoid cells suggested a role of p53 mutation in the rhabdoid dedifferentiation of adenocarcinoma cells.

No potential conflict of interest relevant to this article was reported.

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Fig. 1
Gross features of case 1 (A) and 2 (B). (A) An ulcerofungating mass arising in the sigmoid colon. (B) An ulcerofungating mass with luminal narrowing in the rectum.
kjpathol-47-372-g001.jpg
Fig. 2
(A) A poorly differentiated adenocarcinoma component (left) and a rhabdoid tumor component (right) are noted. (B) A transitional area from the poorly differentiated adenocarcinoma to the rhabdoid cells is noted. Adenocarcinoma cells are positive for cytokeratin 20 (C), but the rhabdoid tumor cells are focally positive (D). A few adenocarcinoma cells are positive for vimentin (E), but, the rhabdoid tumor cells are diffusely positive (F). E-cadherin immunoreactivity is attenuated in the adenocarcinoma cells (G) and negative in the rhabdoid tumor cells (H).
kjpathol-47-372-g002.jpg
Fig. 3
(A) A gland-forming adenocarcinoma component (upper) and a rhaboid tumor component (lower) are noted. (B) A transition from the malignant gland to the rhabdoid cells is noted. Immunohistochemical stains for cytokeratin (C, D) and vimentin (E, F) are positive in both the adenocarcinoma component and the rhabdoid tumor component. The immunohistochemical stain for p53 is negative in the adenocarcinoma cells (G), but a small subset of the rhabdoid cells are positive (H).
kjpathol-47-372-g003.jpg
Table 1.
Immunohistochemical findings and microsatellite instability (MSI) results of colorectal malignant extrarenal rhabdoid tumors in the literatures
Reference Adenocarcinoma cells
Rhabdoid tumor cells
Positive Negative Positive Negative MSI
Chetty and Bhathal [12] Mixed CK vimentin, EMA, CEA - Mixed CK, vimentin, EMA - -
Yang et al. [6] - - Mixed CK, vimentin EMA -
Marcus et al. [7] - - Mixed CK, vimentin, p53 EMA -
Nakamura et al. [8] - - Mixed CK, vimentin, p53 EMA -
Kono et al. [13] CK7, mixed CK vimentin p53 Mixed CK, vimentin, p53 CK7, CK20 Stable
Oh et al. [14] Mixed CK Vimentin Mixed CK, vimentin - -
Mastoraki et al. [9] - - Mixed CK, vimentin, synaptophysin CK7, CK20 -
Lee et al. [10] - - Mixed CK, vimentin, EMA - -
Pancione et al. [11] - - Mixed CK, CK18, CK19, vimentin, p53, MSH2 CK5, CK7, CK20, E-cadherin, MLH1 High
Remo et al. [15] CK20, vimentin, MSH2 CK7, MLH1 Vimentin, MSH2 CK7, CK20, MLH1 High
Present case 1 Mixed CK, CK20, vimentin, EMA, MLH1, MSH2, MSH6, PMS2, attenuation for E-cadherin p53 Mixed CK, CK20, vimentin, EMA, MLH1, MSH2, MSH6, PMS2, p53 E-cadherin, p53 Stable
Present case 2 Mixed CK, CK20, vimentin, EMA, MLH1, MSH2, MSH6, PMS2, attenuation for E-cadherin p53 Mixed CK, vimentin, MLH1, MSH2, 6, PMS2, p53 CK20, EMA E-cadherin Stable

CK, cytokeratin; EMA, epithelial membranous antigen; CEA, carcinoembryonin antigen.

Table 2.
Clinical findings of colorectal malignant extrarenal rhabdoid tumors in the literatures
Author Age (yr)/Sex Site Size (cm) Histology Preoperative metastasis Outcome (after operation)
Chetty and Bathal [12] 72/F Cecum 6 × 5 Composite Liver, lymph node Dead (3 mo)
Yang et al. [6] 75/M Transverse 15 × 10 Pure Lymph node Dead (2 wk)
Marcus et al. [7] 84/F Transverse 7 × 6 Pure None Alive (12 mo)
Nakamura et al. [8] 76/M Cecum 14 × 8 Pure Liver, lymph node Dead (12 wk)
Kono et al. [13] 66/M Cecum 13 × 13 Composite Lymph node, peritoneum Dead (6 wk)
Oh et al. [14] 69/F Sigmoid 3.5 × 3 Composite Lymph node Dead (6 mo)
Mastoraki et al. [9] 62/F Descending & sigmoid 10 × 8 Pure Liver, peritoneum, pelvis Dead (4 mo)
Lee et al. [10] 63/M Ascending 3 × 2.5 Pure Ileum Alive (undescribed follow-up period)
Pancione et al. [11] 71/M Cecum 10 × 10 Pure None Dead (8 mo)
Remo et al. [15] 73/F Cecum 10 × 8 Composite Lymph node Dead (6 mo)
Present case 1 62/M Sigmoid 4.5 × 4 Composite Lymph node Alive (36 mo)
Present case 2 83/F Rectum 6.5 × 4.3 Composite Liver, lung, lymph node Dead (1 mo)

F, female; M, male.

Figure & Data

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