Prognosis Of Esophageal Squamous Cell Carcinoma Research Articles

Src heterodimerically activates Lyn or Fyn to serve as targets for the diagnosis and treatment of esophageal squamous cell carcinoma.

Although Src is one of the oldest and most investigated oncoproteins, its function in tumor malignancy remains to be defined further. In this study, we demonstrated that the inhibition of Src activity by ponatinib effectively suppressed several malignant phenotypes of esophageal squamous cell carcinoma (ESCC) both in vitro and in vivo, whereas it did not produce growth-inhibitory effects on normal esophageal epithelial cells (NEECs). Importantly, we combined phosphoproteomics and several cellular and molecular biologic strategies to identify that Src interacted with the members of Src-family kinases (SFKs), such as Fyn or Lyn, to form heterodimers. Src interactions with Fyn and Lyn phosphorylated the tyrosine sites in SH2 (Fyn Tyr185 or Lyn Tyr183) and kinase domains (Fyn Tyr420 or Lyn Tyr397), which critically contributed to ESCC development. By contrast, Src could not form heterodimers with Fyn or Lyn in NEECs. We used RNA sequencing to comprehensively demonstrate that the inhibition of Src activity effectively blocked several critical tumor-promoting pathways, such as JAK/STAT, mTOR, stemness-related, and metabolism-related pathways. Results of the real-time polymerase chain reaction (RT-PCR) assay confirmed that Lyn and Fyn were critical effectors for the Src-mediated expression of tumor growth or metastasis-related molecules. Furthermore, results of the clinical ESCC samples showed that the hyperactivation of pSrc Tyr419, Fyn Tyr185 or Tyr420, and Lyn Tyr183 or Tyr397 could be biomarkers of ESCC prognosis. This study illustrates that Src/Fyn and Src/Lyn heterodimers serve as targets for the treatment of ESCC.

Old age and intense chemotherapy exacerbate negative prognostic impact of postoperative complication on survival in patients with esophageal cancer who received neoadjuvant therapy: a nationwide study from 85 Japanese esophageal centers.

The prognostic impact of docetaxel, cisplatin, and 5-FU (DCF) reported in JCOG1109 was successfully validated using real-world data in patients < 75years old. However, DCF was not reported to be beneficial in elderly patients with a relatively higher postoperative complication incidence. This study aimed to clarify the impact of postoperative complications on the prognosis of ESCC and the difference in the magnitude of the impact by age and regimen. Patients with esophageal squamous cell carcinoma (ESCC) who underwent subtotal esophagectomy at 85 authorized institutes were retrospectively reviewed from 2010 to 2015. The prognostic impact of postoperative anastomotic leakage (AL) and pneumonia on survival was evaluated. The prognostic value of the postoperative complications was assessed by stratifying patients according to age and neoadjuvant chemotherapy regimen. Patients with AL, pneumonia, and infectious complications (ICs: a combination of pneumonia and AL) showed significantly worse overall survival (OS). IC served as a negative prognostic factor of OS and recurrence-free survival, and its negative prognostic impact was more evident in patients aged > 75years. When the patients were further stratified by chemotherapeutic regimens, using the CF/IC(-) group as a reference, the DCF/IC (+) group showed significantly shorter OS in patients aged > 75years with a hazard ratio (HR) of 2.551. The HR of the CF/IC (+) group was 1.503. The negative impact of postoperative complications on survival was confirmed in this nationwide study. Furthermore, its magnitude was higher in elderly patients who received triplet chemotherapy.

EXOC3L1: A Novel Prognostic Biomarker Correlated with Immune Infiltration in Esophageal Squamous Cell Carcinoma.

BACKGROUND Exocyst complex component 3-like 1 (EXOC3L1) is ubiquitously present in multiple organs. However, its role in esophageal squamous cell carcinoma (ESCC) remains unknown. The aim of this study was to explore the relationship between EXOC3L1 and ESCC. MATERIAL AND METHODS A total of 652 normal samples and 82 ESCC samples obtained from the University of California Santa Cruz (UCSC) Xena were applied to detect the expression difference of EXOC3L1. GSE53625 with 179 paired samples and GSE161533 with 28 paired samples were used for validation. The correlation between clinicopathological features and EXOC3L1 expression was calculated. Kaplan-Meier method was employed to assess the prognostic value of EXOC3L1 in ESCC. Univariate and multivariate Cox regression analyses were carried out to screen the factors contributing to the prognosis of ESCC. In addition, functional enrichment analysis, protein-protein interaction (PPI) network analysis, and immune infiltration analysis were conducted to identify the significantly involved functions of EXOC3L1. RESULTS EXOC3L1 was significantly overexpressed in ESCC compared to normal samples. High expression of EXOC3L1 was associated with worse prognosis, and univariate and multivariate Cox regression analysis demonstrated that EXOC3L1 was an independent prognostic predictor of ESCC. Functional enrichment analysis and immune infiltration analysis disclosed that the expression of EXOC3L1 was correlated with the abundance of several types of immune cells. CONCLUSIONS EXOC3L1 plays a crucial role in the prognosis of ESCC, and it may serve as a reliable biomarker for predicting the survival and a potential therapeutic target for ESCC.

LINC01232 Facilitates the Proliferation of Esophageal Squamous Cell Carcinoma by Sponging miR-708-5p to Upregulate Upstream Stimulatory Factor 1

LncRNAs are vital regulators in human diseases. LINC01232 is found to be upregulated in esophageal squamous cell carcinoma (ESCC). This study aims to uncover the biological functions of LINC01232 in the development of ESCC and the underlying mechanism. Expression pattern of LINC01232 and its influence on the prognosis in ESCC were determined by analyzing the dataset downloaded from TCGA. LINC01232 levels in ESCC tissues and cell lines were detected by quantitative real-time polymerase chain reaction (qRT-PCR). Regulatory effects of LINC01232 on proliferative and apoptotic abilities in ESCC were examined by Cell Counting Kit (CCK-8) assay, colony formation assay and flow cytometry, respectively. The interaction in the LINC01232/miR-708-5p/USF1 axis was tested by dual-luciferase reporter assay. By analyzing ESCC profiling downloaded from TCGA, LINC01232 was found to be upregulated in ESCC tissues, while its level was unrelated to overall survival and disease-free survival in ESCC patients. LINC01232 was further confirmed to be highly expressed in ESCC tissues and cell lines we collected. Knockdown of LINC01232 inhibited proliferative ability and induced apoptosis in ESCC cells. LINC01232 competed with USF1 to bind miR-708-5p, and thereafter regulated the development of ESCC. LINC01232/miR-708-5p/USF1 axis is responsible for facilitating the proliferative ability in ESCC, thereby aggravating the malignant development of ESCC.

Prognostic significance of CDK6 amplification in esophageal squamous cell carcinoma

Dysregulation of CDK6 plays crucial roles in the carcinogenesis of many kinds of human malignancies. However, the role of CDK6 in esophageal squamous cell carcinoma (ESCC) is not well known. We investigated the frequency and prognostic value of CDK6 amplification to improve the risk stratification in patients with ESCC. Pan-cancer analysis of CDK6 was conducted on The Cancer Genome Atlas (TCGA), Genotype-Tissue Expression (GTEx) and Gene Expression Omnibus (GEO) databases. CDK6 amplification was detected in 502 ESCC samples by Fluorescence in situ hybridization (FISH) through tissue microarrays (TMA). Pan-cancer analysis revealed that CDK6 mRNA level was much higher in multiple kinds of cancers and higher CDK6 mRNA level indicated a better prognosis in ESCC. In this study, CDK6 amplification was detected in 27.5% (138/502) of patients with ESCC. CDK6 amplification was significantly correlated with tumor size (p = 0.044). Patients with CDK6 amplification tended to have a longer disease-free survival (DFS) (p = 0.228) and overall survival (OS) (p = 0.200) compared with patients without CDK6 amplification but of no significance. When further divided into I–II and III–IV stage, CDK6 amplification was significantly associated with longer DFS and OS in III-IV stage group (DFS, p = 0.036; OS, p = 0.022) rather than in I-II stage group (DFS, p = 0.776; OS, p = 0.611). On univariate and multivariate analysis of Cox hazard model, differentiation, vessel invasion, nerve invasion, invasive depth, lymph node metastasis and clinical stage were significantly associated with DFS and OS. Moreover, invasion depth was an independent factor for ESCC prognosis. Taken together, for ESCC patients in III-IV stage, CDK6 amplification indicated a better prognosis.

HSF1 expression in tumor-associated macrophages promotes tumor cell proliferation and indicates poor prognosis in esophageal squamous cell carcinoma.

Tumor-associated macrophages (TAMs), are crucial for the survival and development of tumor cells. Heat shock factor 1 (HSF1) is a potent, complex carcinogenesis modulator, and esophageal cancer (EC) patients have a bad prognosis when HSF1 is highly expressed. HSF1's clinical importance and biological role in TAMs are still unknown. The HSF1 expression profile and patient survival information were analyzed from the TCGA database. The infiltration of different types of immune cells in EC was evaluated based on HSF1 gene expression by Sangerbox 3.0. Immunochemistry was employed to assess HSF1 protein expression in 134 individuals with esophageal squamous cell carcinoma (ESCC), proceeded by association with clinicopathological variables. The role of macrophage-driven HSF1 were observed using HSF1-knockdown THP1 cells. High level of HSF1 have a poorer prognosis in individuals with EC. The expressing level of HSF1 was positively related to infiltration of M2 macrophages (P < 0.05). The expression of HSF1 in macrophages was an independent factor for DFS (P = 0.002) and OS (P = 0.002) in ESCC cases. HSF1 was up-regulated in IL-4 stimulation THP1 cells in a time-dependent manner. Under the heat stimulation condition, THP1-derived macrophages were more sensitive than tumor cells. Compared to IL-4 induced-THP1 cells control, the HSF1 knockdown in THP1 cell inhibited the growth and proliferation of ESCC cells. The up-regulation of HSF1 was more rapid and could affect the proliferation of tumor cells in IL4-induced macrophages. The expression of HSF1 in TAMs can also serve as a marker for ESCC prognosis.

Multimodal Treatment Strategies to Improve the Prognosis of Locally Advanced Thoracic Esophageal Squamous Cell Carcinoma: A Narrative Review.

Esophageal cancer is the seventh most common malignancy and sixth most common cause of cancer-related death globally. Esophageal squamous cell carcinoma (ESCC) with aortic or tracheal invasion is considered unresectable, and has an extremely poor prognosis; its standard treatment is definitive chemoradiotherapy (dCRT). In recent years, induction chemotherapy (ICT) has been reported to yield high response rates for locally advanced ESCC, and the efficacy and safety of ICT followed by conversion surgery (CS) have been investigated. Multimodal treatment, combining surgery with induction chemoradiotherapy (ICRT) or ICT, is necessary to improve ESCC prognosis. CS is generally performed for locally advanced ECC after ICRT or ICT when tumor downstaging is achieved, although its prognostic benefit remains controversial. The Japan Clinical Oncology Group (JCOG) has conducted a three-arm phase III randomized controlled trial (JCOG1510) to confirm the superiority of DCF (docetaxel, cisplatin, and 5-fluorouracil) ICT, over conventional dCRT, among patients with initially unresectable ESCC. In recent years, researchers have reported favorable outcomes of induction therapy followed by CS and salvage surgery, after dCRT or systemic immunochemotherapy. In this review, we will describe the latest developments in the multimodal treatment including chemotherapy, CRT, surgery, and immunotherapy, which may improve oncological and survival outcomes for patients with cT4 ESCC.

MicroRNAs in esophageal squamous cell carcinoma: Application in prognosis, diagnosis, and drug delivery.

MicroRNAs (miRNAs) play a vital role in various cell biology processes, including cancer formation. These small non-coding RNAs could function as diagnostic and prognostic markers. They may involve esophageal squamous cell carcinoma (ESCC) and distinctive miRNA expression profiles; they are also known as therapeutic targets in human diseases. Therefore, in this study, the function of miRNAs was reviewed regarding the prognosis and diagnosis of ESCC. The changes in miRNAs before and after cancer therapy and the effects of miRNAs on chemo-susceptibility patterns were also investigated. MiRNA delivery systems in ESCC were also highlighted, providing a perspective on how these systems can improve miRNA efficiency.

Multi-omics profiling identifies C1QA/B+ macrophages with multiple immune checkpoints associated with esophageal squamous cell carcinoma (ESCC) liver metastasis

Esophageal squamous cell carcinoma (ESCC) is a highly lethal malignant tumor lacking effective treatments; 20% of ESCC patients develop liver metastasis with an extremely short survival time of ≈5 months. The tumor microenvironment (TME) plays a crucial role in tumor homeostasis, but the relationship between the ESCC TME and liver metastasis is still unknown. To identify potential cell populations contributing to ESCC liver metastasis, single-cell RNA (scRNA) sequencing data were analyzed to identify the major cell populations within the TME. Each of the major cell populations was re-clustered to define detailed cell subsets. Thereafter, the gene set variation analysis (GSVA) score was calculated for the bulk RNA-seq data based on the gene signatures of each cell subset. The relationship between the GSVA score of each cellular subset and clinical outcome was further analyzed to identify the cellular subset associated with ESCC liver metastasis, which was validated by multiplex immunohistochemistry. C1QA/B+ tumor-associated macrophages (TAMs) acted as the central regulator of the ESCC TME, closely associated with several key cell subsets. Several immune checkpoints, including CD40, CD47 and LGALS9, were all positively expressed in C1QA/B+ macrophages, which may exert central regulatory control of immune evasion by ESCC via these immune checkpoints expressions. Our results comprehensively revealed the landscape of tumor-infiltrating immune cells associated with ESCC prognosis and metastasis, and suggest a novel strategy for developing immunotherapies for ESCC liver metastasis by targeting C1QA/B+ TAMs.

Antisense lncRNA NNT-AS1 promoted esophageal squamous cell carcinoma progression by regulating its sense gene NNT expression

Antisense lncRNAs were endogenous productions from the antisense strand of coding genes and were transcribed in the reverse direction of the sense gene. The purpose of this study was to evaluate the roles and functions of antisense lncRNAs in esophageal squamous cell carcinoma (ESCC). Differentially expressed antisense lncRNAs were initially screened based on transcriptome data of 119 paired ESCC samples in GSE53624 and were further validated in 6 paired ESCC samples from our institution. Log-rank test was adopted to identify ESCC prognosis-associated lncRNAs. Finally, functional assays were performed to reveal the functions of our identified antisense lncRNAs. In total, 174 antisense lncRNAs were differentially expressed in both GSE53624 and JSPH databases. Five of them were significantly associated with ESCC prognosis (NNT-AS1, NKILA, CCDC18-AS1, SLCO4A1-AS1, and AC110619.1). Of note, NNT-AS1 showed the most significant association with ESCC prognosis. The upregulation of NNT-AS1 was further confirmed in ESCC cells. Knockdown of NNT-AS1 inhibited ESCC cell proliferation, migration, promoted ESCC cells apoptosis, and induced cell cycle arrest in the G2/M stage. NNT-AS1 expression significantly correlated with its sense gene NNT. As expected, NNT-AS1 knockdown suppressed NNT expression. Inhibition of NNT repressed ESCC cell proliferation and migration, and accelerated ESCC cell apoptosis. Overexpression of NNT could rescue the suppressed proliferation and migration of ESCC cells induced by the silencing of NNT-AS1. In terms of mechanism, NNT-AS1 served as a competing endogenous RNA to sponge the miR-382-5p, which could inhibit NNT expression. Pathway enrichment analysis and western blot assay indicated that NNT-AS1 and NNT could regulate the cell cycle pathway. In conclusion, antisense lncRNA NNT-AS1 facilitated ECSS progression by targeting its sense gene NNT through sponging miR-382-5p. This study provided us with a deeper insight into the roles of antisense lncRNAs in ESCC and identified novel potential therapeutic targets.

Inflammation-related parameter serve as prognostic biomarker in esophageal squamous cell carcinoma.

The aim of this study was to explore the predictive role of inflammation-related parameters in prognosis of esophageal squamous cell carcinoma (ESCC). A total of 370 ESCC patients subjected to curative surgery were enrolled. All patients had complete medical records and did not receive preoperative adjuvant therapy. Preoperative systemic immune-inflammation index (SII) was calculated as platelet count × neutrophil count/lymphocyte count, prognostic nutrition index (PNI) as albumin concentration (g/L) + 5 × total lymphocyte count (109/L), and systemic inflammation response index (SIRI) as neutrophil count × monocyte count/lymphocyte count. The optimal cut-off values of preoperative SII, neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), lymphocyte-to-monocyte ratio (LMR), PNI, and SIRI were determined via receiver operating characteristic (ROC) analysis, and their correlations with clinical parameters and survival analyzed. NLR was associated with gender (P = 0.022), and PLR (P = 0.037), PNI (P = 0.017) was associated with survival status, LMR was related with gender (P = 0.034) and survival status (P = 0.01), SIRI was correlated with gender (P = 0.000), smoking history (P = 0.000) and drinking history (P = 0.004). Survival analysis indicated that high PLR (P = 0.042), low LMR (P = 0.001), and low PNI (P = 0.007) were predictive of poor prognosis of ESCC. Stratified analysis revealed the prognostic predictor roles of distinct markers in different ESCC subgroups. SII and SIRI were predominantly correlated with the clinical outcome in the lymphatic metastasis subgroup. Further univariate analysis disclosed that T stage, smoking history, lymphatic metastasis, TNM staging, PLR, LMR, and PNI potentially serve as influencing factors(P < 0.05). Multivariate analysis identified T stage (HR = 1.781, P = 0.002), TNM staging (HR = 8.617, P = 0.001) and LMR (HR = 0.504, P = 0.001) as independent predictors for outcomes of ESCC. Low LMR could serve as an independent marker of poor prognosis in patients with ESCC. Inflammation-related markers have distinct predictive roles in ESCC subgroups with different features.

Pembrolizumab: first anti-PD-1/L1-based regimen for first-line treatment of advanced esophageal cancer in Japan

ABSTRACT Introduction Esophageal cancer (EC) is the ninth most common cancer in Japanese men. Esophageal squamous cell carcinoma (ESCC) is the major histological type and accounts for 90% of EC cases in Japan. The prognosis of advanced ESCC remains poor. The standard treatment for advanced ESCC was palliative chemotherapy with 5-fluorouracil plus cisplatin as first-line chemotherapy. After failure of first-line chemotherapy, taxanes were used as second-line chemotherapy. Recently, pembrolizumab monotherapy has demonstrated benefits as a second-line treatment in patients with advanced ESCC and a combined positive score of ≥10. Survival was found to be improved in patients with advanced EC who received first-line treatment with pembrolizumab plus doublet chemotherapy than in those who received doublet chemotherapy alone. Areas covered This overview of immune checkpoint inhibitors focuses on pembrolizumab in combination with chemotherapy and shares key clinical data relevant to the treatment of patients with EC in Japan. Expert opinion Pembrolizumab plus doublet chemotherapy is now an established first-line treatment for advanced EC in Japan. Recently, nivolumab plus doublet chemotherapy and nivolumab plus ipilimumab have also become first-line treatment options for patients with advanced ESCC. Further investigations are needed to identify biomarkers that would be useful for selecting candidates for these treatments.

Effects of let-7a microRNA and C–C chemokine receptor type 7 expression on cellular function and prognosis in esophageal squamous cell carcinoma

BackgroundC–C chemokine receptor type 7 (CCR7) participates in chemotactic and metastatic responses in various cancers, including in esophageal squamous cell carcinoma (ESCC). The microRNA (miRNA) let-7a suppresses migration and invasion of various types of cancer cells by downregulating CCR7 expression.MethodsThe expression levels of CCR7 and let-7a were measured in the cell lines, tumor, and peritumoral tissues of ESCC patients. KYSE cell lines were transfected with synthetic let-7a miRNA and a let-7a miRNA inhibitor, and their CCR7 expression levels as well as invasive ability were evaluated. A highly invasive cell line was established via an invasion assay, and CCR7 expression level along with let-7a level was subsequently evaluated. Cancer cells overexpressing CCR7 were injected subcutaneously into mice, and the animals were monitored for tumor growth along with lymph node metastasis.ResultsA negative correlation between CCR7 and let-7a expression was observed in the ESCC cell lines as well as in tissue samples from patients. Synthetic let-7a decreased CCR7 expression level, while the let-7a inhibitor increased it. In vitro, the established highly invasive cancer cells with high and low levels of CCR7 and let-7a expression, respectively, exhibited a greater invasive ability than the wild-type cell line. The cells were associated with tumor growth and lymph node metastasis in mice. Patients in the high-CCR7/low-let-7a group had the worst prognosis, with a five-year recurrence free survival (5-RFS) rate of 37.5%, followed by the high-CCR7/high-let-7a (5-RFS: 60.0%) and low-CCR7 (5-RFS: 85.7%; p = 0.038) groups.ConclusionsThe expression of CCR7 was downregulated by let-7a miRNA in esophageal cancer cells. The decrease in let-7a expression level led to the increased expression level of CCR7 in ESCC cells, consequently increasing their invasive ability and malignancy and resulting in a worse prognosis for ESCC patients.Trial registration.Retrospectively registered.

Human umbilical cord mesenchymal stem cell-derived extracellular vesicles carrying miR-655-3p inhibit the development of esophageal cancer by regulating the expression of HIF-1α via a LMO4/HDAC2-dependent mechanism.

This study clarified the function of human umbilical cord mesenchymal stem cell (hUCMSC)-derived extracellular vesicle (EV)-enclosed miR-655-3p in esophageal squamous cell carcinoma (ESCC). A Chi-square test and the Kaplan-Meier estimator were used to analyze the prognosis of ESCC in relation to the expression of miR-655-3p. ESCC cells were incubated with PBS or hUCMSC-derived EVs (hUCMSC-EVs) in the conditions of gene modification, after which the malignant behaviors of ESCC cells were assessed and the molecular interactions were determined. The effect of hUCMSC-derived EV-miR-655-3p was also investigated in a nude mouse model of ESCC. Low expression of miR-655-3p indicated poor prognosis of ESCC. hUCMSC-EVs suppressed the malignant behaviors of ESCC cells and the growth and liver metastasis of transplanted tumors. Inhibition of miR-655-3p in hUCMSCs impaired the therapeutic effect of hUCMSC-EVs. LMO4, targeted by miR-655-3p, activated the transcription of HIF-1α by sequestering HDAC2 from HIF-1α promoter. Knockdown of LMO4 suppressed ESCC cell activities, while overexpression of HIF-1α counteracted the tumor suppressive effect of LMO4 knockdown. miR-655-3p enclosed in hUCMSC-derived EVs inhibits ESCC progression partially by inactivating HIF-1α via the LMO4/HDAC2 axis.

MiR-18a-5p and ATM Expression in Esophageal Squamous Cell Carcinoma and Their Correlations with Clinicopathological Features.

Objective To investigate miR-18a-5p and ataxia telangiectasia muted (ATM) expression in esophageal squamous cell carcinoma (ESCC) and their correlations with clinicopathological features. Methods The subjects of this study were 62 ESCC patients (research group, RG) and 57 healthy controls (control group, CG) presented to our hospital between July 2019 and April 2020. Peripheral blood (PB) miR-18a-5p and ATM levels in these participants were quantified via qRT-PCR, and the correlations of the two genes with ESCC patients' clinicopathological characteristics were investigated. In addition, a two-year follow-up was performed on ESCC patients to understand their survival, so as to further determine the prognostic utility of miR-18a-5p and ATM in ESCC. Factors influencing patient outcomes were identified by COX analysis. Results PB miR-18a-5p expression was higher in RG compared with CG, while ATM was lower, suggesting an inverse connection between the two genes in ESCC (P < 0.001). miR-18a-5p and ATM levels were determined to be strongly linked to TNM stage, differentiation degree, and lymph node metastasis in ESCC patients (P < 0.001 and P = 0.007). The patients who succumbed to the disease exhibited higher miR-18a-5p and lower ATM than the survival (P < 0.05). ROC analysis suggested favorable evaluation effects of miR-18a-5p and ATM on the occurrence and prognostic death of ESCC (P < 0.001). Further, these two genes were identified by the COX analysis to be factors independently affecting the prognosis of ESCC. Conclusion miR-18a-5p is highly expressed in ESCC, and ATM is underexpressed, both of which are closely linked to the pathological process of ESCC and have a good evaluation effect on the occurrence and prognosis of ESCC, which may become a breakthrough in future diagnosis and treatment of ESCC.

The area of residual tumor predicts esophageal squamous cell carcinoma prognosis following neoadjuvant chemotherapy.

To clarify the utility of the area of residual tumor for patients with esophageal squamous cell cancer treated with neoadjuvant chemotherapy. We enrolled 186 patients with esophageal squamous cell cancer who underwent surgical resection following neoadjuvant chemotherapy at our hospital. Using digital images, we measured the area of residual tumor at the maximum plane of the specimen and divided the patient into three groups as follows: 0 (area = 0 mm2), low (area = 0-40 mm2), and high (area ≥ 40 mm2). The clinicopathological factors and prognosis were compared among these groups. The median area of the residual tumor was 15.0 mm2 (range 0-1,448.8 mm2). Compared with the 0 and low group, the high group was significantly associated with poorer recurrence-free survival (all P < .001) and overall survival (P < .001 [vs. 0] and P = .017 [vs low]). The area of residual tumor, ypN, tumor regression grade, and lymphovascular invasion were independent predictors of recurrence-free survival. By dividing the patients using a combination of the area of residual tumor and lymphovascular invasion, the high and/or lymphovascular invasion ( +) group displayed significantly poor recurrence-free survival than the 0 group and low/lymphovascular invasion ( -) group. However, there was no significant difference in the recurrence-free survival between the 0 group and low/lymphovascular invasion ( -) group. The area of residual tumor is a promising histopathological prognostic factor for patients with esophageal squamous cell cancer treated with neoadjuvant chemotherapy. Moreover, it is a possible candidate histopathological factor for postoperative chemotherapy selection.

MiR-375 suppresses the growth and metastasis of esophageal squamous cell carcinoma by targeting PRDX1.

Esophageal cancer (EC) is one of the most lethal cancers. Esophageal squamous cell carcinoma (ESCC) is the most common histological subtype in Asian people. Diverse microRNAs, such as miR-375, have been confirmed to be involved in the process of tumorigenesis and metastasis. However, the underlying mechanism through which miR-375 acts in ESCC patients remains unknown. We used The Cancer Genome Atlas (TCGA) database to analyze the association between miR-375 and the survival rate in patients with esophageal squamous cell carcinoma. Real Time quantitative PCR (RT-qPCR) analysis was performed to evaluate the level of miR-375 in EC tissues and cells. A luciferase reporter assay was used to confirm the target gene of miR-375. A colony formation assay as well as flow cytometric and transwell invasion experiments were employed to examine the effects of miR-375 and peroxiredoxin 1 (PRDX1) on ESCC cells. A tumor xenograft mouse model was then used to investigate the role of miR-375 on tumor growth in vivo. Moreover, we performed rescue experiments to evaluate the effect of PRDX1 on ESCC progression. miR-375 expression was significantly downregulated in both ESCC clinical tissues and serum, and the reduction of miR-375 was remarkably linked to a poor prognosis in ESCC. Further investigation illustrated that aberrant expression of miR-375 dampened the growth and infiltration of ESCC cells both in vitro and in vivo. Bioinformatics and luciferase reporter analysis verified that the transcript of PRDX1 is a direct target of miR-375 and its expression in ESCC cells was found to be inversely modulated by miR-375. Moreover, the tumor formation experiment in nude mice confirmed that miR-375 can effectively dampen tumor growth in xenograft tumor mice models. Notably, over-expression of PRDX1 effectively counteracted the tumor-suppressing capabilities of miR-375. We demonstrated the antitumor effect of miR-375 on ESCC by targeting PRDX1 both in vitro and in vivo.

Melatonin inhibits ESCC tumor growth by mitigating the HDAC7/β-catenin/c-Myc positive feedback loop and suppressing the USP10-maintained HDAC7 protein stability.

BackgroundMelatonin, a natural hormone secreted by the pineal gland, has been reported to exhibit antitumor properties through diverse mechanisms of action. However, the oncostatic function of melatonin on esophageal squamous cell carcinoma (ESCC) remains elusive. This study was conducted to investigate the potential effect and underlying molecular mechanism of melatonin as single anticancer agent against ESCC cells.MethodsESCC cell lines treated with or without melatonin were used in this study. In vitro colony formation and EdU incorporation assays, and nude mice tumor xenograft model were used to confirm the proliferative capacities of ESCC cells. RNA-seq, qPCR, Western blotting, recombinant lentivirus-mediated target gene overexpression or knockdown, plasmids transfection and co-IP were applied to investigate the underlying molecular mechanism by which melatonin inhibited ESCC cell growth. IHC staining on ESCC tissue microarray and further survival analyses were performed to explore the relationship between target genes’ expression and prognosis of ESCC.ResultsMelatonin treatment dose-dependently inhibited the proliferative ability and the expression of histone deacetylase 7 (HDAC7), c-Myc and ubiquitin-specific peptidase 10 (USP10) in ESCC cells (P < 0.05). The expressions of HDAC7, c-Myc and USP10 in tumors were detected significantly higher than the paired normal tissues from 148 ESCC patients (P < 0.001). Then, the Kaplan–Meier survival analyses suggested that ESCC patients with high HDAC7, c-Myc or USP10 levels predicted worse overall survival (Log-rank P < 0.001). Co-IP and Western blotting analyses further revealed that HDAC7 physically deacetylated and activated β-catenin thus promoting downstream target c-Myc gene transcription. Notably, our mechanistic study validated that HDAC7/β-catenin/c-Myc could form the positive feedback loop to enhance ESCC cell growth, and USP10 could deubiquitinate and stabilize HDAC7 protein in the ESCC cells. Additionally, we verified that inhibition of the HDAC7/β-catenin/c-Myc axis and USP10/HDAC7 pathway mediated the anti-proliferative action of melatonin on ESCC cells.ConclusionsOur findings elucidate that melatonin mitigates the HDAC7/β-catenin/c-Myc positive feedback loop and inhibits the USP10-maintained HDAC7 protein stability thus suppressing ESCC cell growth, and provides the reference for identifying biomarkers and therapeutic targets for ESCC.Supplementary InformationThe online version contains supplementary material available at 10.1186/s40779-022-00412-0.

319. SIGNIFICATIONS OF EXPRESSION OF TOLL-LIKE RECEPTORS IN ESOPHAGEAL SQUAMOUS CELL CARCINOMA CELLS

Abstract Well known risk factors of Esophageal squamous cell carcinoma (ESCC) are habit of alcoholic drinking, smoking and poor diet. Moreover, recent reports showed that poor oral health is associated with upper aerodigestive tract malignancies including ESCC. We previously reported that among 232 ESCC patients who had preoperative assessment of oral function by dentist, about 70% of patients were diagnosed with periodontitis and about half of those patients were needed dental extraction. Toll-like receptors (TLRs), a family of pattern recognition receptors, are able to recognize pathogen-associated molecular patterns (PAMPs) associated with a wide range of viruses, bacteria, fungi and parasites and thus play key roles in innate immune responses. Among these TLRs, TLR4 recognizes LPS, which construct the cell wall of gram-negative bacteria. Based on these findings, it is supposed that continuous exposure of LPS from gram-negative periodontal bacteria induces chronic inflammation caused by inflammatory cytokines from TLR4 signals, then carcinogenesis and progression of ESCC occurs. Among these TLRs, TLR4 recognizes LPS, which construct the cell wall of gram-negative bacteria. We reported that ESCC patients who had higher TLR4 expression status in resected main tumor specimen showed significantly poor overall survival compared to lower patients after esophagectomy. (Sato Y, et al. Esophagus 2020) On the other hand, TLR3 recognizes dsRNA released form cell invading viruses. We previously reported that ESCC patients who had higher TLR3 expression status in resected main tumor specimen showed significantly better overall survival compared to lower patients after esophagectomy. (Sato Y, et al. Am J Surg. 2018). Though TLR3 and TLR4 are in the same TLR family, those functional mechanism and relationships to prognosis in ESCC are totally different. Because TLR4 signaling is stimulatory on proliferative ability of ESCC, it is supposed that improvement of oral health inhibits carcinogenesis and progression of ESCC. On the other hand, because TLR3 signaling is suppressive, TLR3 agonist should be a possible candidate of therapeutic agent.

184. THE PROGNOSTIC VALUE AND MOLECULAR PROPERTIES OF TERTIARY LYMPHOID STRUCTURES IN ESOPHAGEAL SQUAMOUS CELL CARCINOMA

Abstract Tertiary lymphoid structures (TLSs) play key roles in tumor adaptive immunity. However, the prognostic value and molecular properties of TLSs in esophageal squamous cell carcinoma (ESCC) patients have not been studied. The prognostic values of the presence and maturation status of tumor-associated TLSs were determined in 394 and 256 ESCCs with hematoxylin and eosin (H&amp;E)-stained slides from Sun Yat-sen University Cancer Center (SYSUCC) and Cancer Hospital of Shantou University Medical College (SUMCCH), respectively. A deep-learning TLS classifier was established with H&amp;E-stained slides using inception-resnet-v2 neural network. Digital spatial profiling (DSP) was performed to determine the cellular and molecular characteristics of TLSs in ESCCs. Immature and mature TLSs were observed in 30.2% and 42.9% ESCCs from SYSUCC by pathological examination. The deep-learning TLSs classifier yielded an area under curve value of 0.975 for patients’ mature TLS detection in the external test set, by which 55.1% ESCCs from SUMCCH were identified with mature TLSs. The presence of mature TLSs associated with an earlier pT-stage and improved survival. Mature TLSs were characterized by increased proportions of proliferating B, plasma, and CD4+ Th cells, and increased B memory, CD4+ T activated and effector memory, and Th17 signatures. TLS-mature ESCCs were with increased intratumoral CD8+ T infiltration. Mature TLSs provide a privileged microniche for B and T cell differentiation and maturation, thereby generating an effective anti-tumor humoral and cellular immunity to improve ESCC prognosis.