alexa Lack of AMACR Immunostaining is an Independent Predictor of Poor Prognosis in Colorectal Carcinoma | OMICS International | Abstract
ISSN: 2161-0681

Journal of Clinical & Experimental Pathology
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Research Article

Lack of AMACR Immunostaining is an Independent Predictor of Poor Prognosis in Colorectal Carcinoma

Emam E1,2, Gomaa W1,3, Al-Ahwal M4,5, Mushref R6, Al-Maghrabi B6, Buhmeida A7, Al-Qahtani M7 and Jaudah Al-Maghrabi1,4*

1Department of Pathology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia

2Department of Pathology, Faculty of Medicine, Alexandria University, Alexandria, Egypt

3Department of Pathology, Faculty of Medicine, Minia University, Al Minia, Egypt

4Scientific Chair for Colorectal Cancer, King Abdulaziz University, Jeddah, Saudi Arabia

5Department of Medicine, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia

6Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia

7Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, Saudi Arabia

*Corresponding Author:
Jaudah Al-Maghrabi
Department of Pathology, Faculty of Medicine
King Abdulaziz University
P.O. BOX 80205, Jeddah
21589, Kingdom of Saudi Arabia
Tel: 00-966-12-6401000, 00-966-504680456
Fax: 00-966-12-6408433
E-mail: [email protected]

Received date: May 24, 2016; Accepted date: June 16, 2016; Published date: June 17, 2016

Citation: Emam E, Gomaa W, Al-Ahwal M, Mushref R, Al-Maghrabi B, et al. (2016) Lack of AMACR Immunostaining is an Independent Predictor of Poor Prognosis in Colorectal Carcinoma. J Clin Exp Pathol 6:279. doi: 10.4172/2161-0681.1000279

Copyright: © Maghrabi JA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Background: AMACR (Alfa-Methylacyl-CoA Racemase) overexpression has become a useful biomarker of prostate cancer. In the present cohort we are aiming to analyse AMACR immunostaining in normal colonic mucosa, colorectal adenoma, and colorectal carcinoma (CRC) to explore the significance of immune-staining in relation to clinic-pathological features, prognosis, and survival.
Materials and Methods: The study included 38 normal colonic mucosae, 40 colorectal adenomas, 196 CRC, and 49 associated lymph node metastasis. Tissue microarrays were designed and constructed and immunostaining was done using anti-AMACR antibody. Results: AMACR was absent in normal colonic mucosa while it showed positive immunostaining in 47.5% of adenomas, 53.6% colorectal carcinomas and 36.7% of nodal metastasis. There was no statistically significant difference between AMACR immunostaining in primary CRC in relation adenomas, and nodal metastasis. Low AMACR immunostaining showed significant association with the occurrence nodal metastasis (p=0.039) and distant metastasis (p=0.022). There was no significant association between AMACR immune-staining and other clinic pathological parameters. Regression analysis revealed that reduced AMACR immunostaining was an independent predictor of positive surgical resection margins, presence of Lymph vascular invasion, distant metastasis, and lymph node metastasis. AMACR immunostaining was not related to both diseases free survival and overall survival. Conclusion: AMACR immune-staining correlated with nodal metastasis and distant metastasis. Loss of immunostaining of AMACR is an independent predictor of lymph vascular invasion, positive surgical margin, nodal and distant metastasis. AMACR may serve as biomarker of progression and prognosis of CRC.


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