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Epithelial-mesenchymal transition, Colorectal neoplasms, Prognosis, Neoplasm invasiveness, What&,rsquo s Known Tumor budding is linked to invasion, metastasis, and poor prognosis in colorectal carcinoma (CRC). Epithelial-mesenchymal transition (EMT) markers such as &,beta -catenin, E-cadherin, Snail, and Zinc finger E-box-binding homeobox 1 (ZEB1) are frequently altered in CRC. Tumor budding has been associated with distant metastasis and other adverse clinicopathological features, but it is underutilized in standard pathology due to assessment challenges. What&,rsquo s New This study highlights a significant correlation between tumor budding and EMT markers in CRC, providing a deeper understanding of invasion mechanisms. This finding contributes to our understanding of invasion mechanisms in CRC. IntroductionColorectal carcinoma (CRC) ranks as the third most frequently diagnosed cancer and is the leading contributor to cancer-related mortality worldwide. It often develops from benign neoplastic lesions, such as adenomatous polyps and serrated polyps. 1, As the molecular understanding of CRC advances, extensive research is being conducted to determine whether these histological or molecular traits can be used to predict treatment outcomes. Two potential classifications of CRCs have emerged from molecular and genetic investigations, including various gene expression analyses. The first classification is sporadic and unrelated to genetic susceptibility or family history, likely arising from environmental and nutritional factors. 2, Nevertheless, a family history of CRC is present in 20-30% of patients with the disease, and 5% of these cancers arise in the context of conditions with Mendelian heredity. These include nonpolyposis disorders such as cancer familial syndrome (formerly Lynch II) and Hereditary Non-Polyposis colorectal cancer (HNPCC, formerly Lynch I), as well as conditions involving colonic polyps. 3, , 4, The Fearon and Vogelstein model has long been accepted as the gold standard for understanding the genetic changes associated with CRC development. 5, Given that molecular alterations are the primary cause of cancer, the ability of malignant tumors to invade nearby tissues and even metastasize to distant sites is a secondary factor. While cancer cells frequently exhibit anchorage-independent growth, normal tissue shows a strong correlation between cell adhesion and signaling, as evidenced by their reliance on anchoring for growth. Two of the most intriguing topics in tumor growth and metastasis are the epithelial-mesenchymal transition (EMT) of tumor cells and tumor budding. 5, The shifts in adhesion and signaling in malignant cells, leading to metastasis, confirm many established theories in this field. Phenotypic alterations during EMT, including the invasion of the extracellular matrix and the departure of cancer cells from the primary tumor to form distant metastases, support the hypothesis that EMT is pathologically reactivated during malignant transformation. 6, Numerous studies have linked tumor budding in CRC to unfavorable outcomes. 7, , 8, The International :union: Against Cancer has classified tumor budding as an &,ldquo additional prognostic marker&,rdquo alongside histological grade, perineural invasion, and tumor boundary. 9, However, several factors have made it challenging to incorporate tumor budding assessment into standard pathology reports. 10, The purpose of the present study is to identify tumor budding in patients with CRC and correlate the results with EMT.Materials and Methods Ethical Approval and Case Selection This study was approved by the Ethics Committee of the University of Duhok, Duhok city, Iraq, and the Duhok Directorate General of Health in Duhok city, Iraq (Approval number, 13062021-7-17). Written informed consent was obtained from all participants. Evaluation of Tumor Budding and Its Relationship with Clinical Features In this retrospective observational study, 101 paraffin-embedded, formalin-fixed CRC tissue blocks were collected between January 2017 and May 2023 in Duhok city, Iraq. All relevant resection specimens and hematoxylin and eosin-stained slides were reassessed by other skilled pathologists, blinded to the clinical outcome. The histopathological details of each tumor were obtained from diagnostic records provided by various attending pathologists. CRC cases diagnosed with endoscopic biopsy or treated with neoadjuvant therapy were excluded. A cohort was used to establish a histopathological cutoff for &,ldquo high&,rdquo tumor budding and to validate its prognostic significance using an established scoring system. 8, According to the tumor budding scoring guidelines from the International Tumor Budding Consensus Conference, 11, cases positive for tumor budding were categorized into three groups, BD1 (1&,ndash 4 buds/0.785 mm2), BD2 (5&,ndash 9 buds/0.785 mm2), and BD3 (10 or more buds/0.785 mm2). Immunohistochemistry The following EMT markers were tested, Snail, Zinc finger E-box-binding homeobox 1 (ZEB1), E-cadherin, and &,beta -catenin. The tissue sections were incubated with the following primary antibodies at room temperature and the indicated dilutions, anti-&,beta -catenin (1,200, Dako, Denmark), anti-E-cadherin (1,100, Dako, Denmark), anti-ZEB1 (1,150, Abcam, UK), anti-Snail (1,500, GeneTex, USA), and anti-vimentin (1,100, Dako, Denmark). Immunohistochemical staining was performed using the DAKO Kit system (DAKO, Denmark) along with a peroxidase/DAB Kit (DAKO).The reactivity was assessed based on the percentage of positive cells and staining intensity. Staining intensity was classified into four levels, negative (0), weak (1), moderate (2), and high (3). Five groups were established based on the percentage of positively stained cells, 0-5% (0), 6-25% (1), 26-50% (2), 51-75% (3), and 76-100% (4). A staining index score between 0 and 12 was calculated by multiplying the staining intensity score by the percentage of positive cells. A staining index score between 6-12 indicated positive protein expression, while a score between 0&,ndash 6 indicated negative protein expression. The subcellular localization of the staining (nucleus, cytoplasm, and membrane) was independently evaluated for &,beta -catenin and E-cadherin. Aberrant expression of E-cadherin and &,beta -catenin was indicated by ectopic staining in the cytoplasm or nucleus and the absence of membrane staining. 12, , 13, Statistical Analysis All statistical analyses were performed using IBM SPSS Statistics software, version 26.0 (IBM Corp., Armonk, NY, USA). Categorical data were presented as numbers and percentages (n, %). The Chi square test and Fisher&,rsquo s exact test were used to assess associations between categorical variables. A P value &,lt 0.05 was considered statistically significant.Results Clinicopathological Characteristics of CRC Patients A total of 101 patients (48 women and 53 men) diagnosed with CRC enrolled in the study. The patients&,rsquo ages ranged from 18 to 83 years, with a mean age of 53.90 years. Tumor grade data showed that moderately differentiated tumors were the most prevalent, accounting for 76.2% of cases, while well-differentiated and poorly differentiated tumors accounted for 15.8% and 7.9%, respectively. Conventional adenocarcinoma was the most common histological type, found in 88 cases (87.1%), while mucinous carcinoma and signet ring cell carcinoma were found in 12 cases (11.9%) and one case (1.0%), respectively. Stage III was the most frequent, present in 37 cases (36.6%), while stage IV was the least common, present in eight cases (7.9%). More than half of the tumors (57.4%) were located in the left colon (58 cases). Data are shown in table 1,.Variantsn (%)Age&,lt 5031 (30.7)&,ge 5070 (69.3)SexMale53 (52.5)Female48 (47.5)Location of TumorRight43 (42.6)Left58 (57.4)Histological TypesConventional adenocarcinoma88 (87.1)Mucinous adenocarcinoma12 (11.9)Signet ring cell adenocarcinoma1 (1.0)GradeWell differentiated 8 (7.9)Moderate differentiated 77 (76.2)Poorly differentiated 16 (15.8)StageI22 (21.8)II34 (33.7)III37 (36.6)IV8 (7.9)Tumor InvasionT15 (5.0)T226 (25.7)T356 (55.4)T414 (13.9)Regional lymph node metastasisN058 (57.4)N126 (25.7)N217 (16.8)Distant metastasisM093 (92.1)M18 (7.9)Vascular InvasionPositive73 (72.3)Negative28 (27.7)Perineural InvasionPositive51 (50.5)Negative50 (49.5)DesmoplasiaPositive66 (65.3)Negative35 (34.7)Lymphocytic InfiltrationPositive69 (68.3)Negative32 (31.7)Total101 (100)Table 1.Clinicopathological characteristics of colorectal carcinoma patients Tumor Budding among CRC Patients Out of 101 patients, 64 cases (63.4%) exhibited tumor budding. Table 2, summarizes all the relevant data. The most prevalent category was low (BD1), while the least common category was high (BD3). Figures 1, and 2, illustrate the tumor budding categories. Tumor budding and advanced tumor stage, tumor invasion, vascular invasion, perineural invasion, and desmoplasia were significantly associated. The link between regional lymph node metastases and tumor budding was highly significant (P=0001). Table 3, shows that N1 revealed 23/26 (88.5%) cases, and N2 revealed 17/17 (100%) cases affected by tumor budding.Categorization of Tumor BuddingPositive Tumor Budding n (%)Negative Tumor Budding n (%)Total n (%)Low (BD1)27 (26.7) Intermediate (BD2)21 (20.8)High (BD3)16 (15.8)Total64 (63.4)37 (36.6)101 (100%)BD1, Budding 1 BD2, Budding 2 BD3, Budding 3 |