An observational study in Colorectal Cancer and Microsatellite Instability, sponsored by The First Affiliated Hospital with Nanjing Medical University. Completed. Open to participants aged 18 Years to 80 Years. Per ClinicalTrials.gov, last updated 2024-02-02.
Sponsored by The First Affiliated Hospital with Nanjing Medical University · Observational
The distribution rate of microsatellite instability-high (MSI-H) was significantly higher in early-onset colorectal cancer, and early-onset colorectal cancer has a specific mutational profile and relatively high programmed cell death ligand 1(PD-L1) expression, which may be used to guide personalized treatment to better control the disease.
The prognosis of early-onset colorectal cancer (EOCRC) is worse than that of late-onset colorectal cancer (LOCRC), and the incidence has gradually increased in recent years, so it is necessary to study the pathogenesis and explore the target of early-onset colorectal cancer patients. In this study, investigators aimed to explore the specific molecular pathologic map of EOCRC by comparing LOCRC. This study enrolled 11,344 patients with colorectal cancer treated at the Colorectal Center of the First Affiliated Hospital of Nanjing Medical University from 2003 to 2022, of whom 578 were EOCRC and 10,766 were LOCRC. The tumor-related mutation status and tumor mutation burden (TMB) of patients were detected by next-generation sequencing technology. PD-L1 expression was detected by immunohistochemistry. The microsatellite instability was detected by polymerase chain reaction (PCR) coupled with capillary electrophoresis (2B3D NCI Panel) in all patients. Among the 11,344 patients, 180 patients with EOCRC and 90 patients with LOCRC patients underwent NGS investigation. Compared with LOCRC, EOCRC patients generally presented a later TNM stage, lower tumor differentiation, and poorer histological type. In LOCRC with MSI-H stupe, TNM stage is earlier than whom with MSI-L/MSS. In addition, the frequency of MSI-H was significantly higher in EOCRC (10.2%) than LOCRC (2.2%). The frequency of 7-mutation panel (ARID1A, FANCI, CASP8, DGFRA, DPYD, TSHR, and PRKCI) were relatively higher in LOCRC. In EOCRC group, the TNM stage of MSI-H subtype patients was earlier while harbored with worse tissue differentiation and higher proportion of mucinous adenocarcinoma. Besides, among the EOCRC patients, FBXW7, FAT1, ATM, ARID1A and KMT2B mutation frequencies were significantly increased in patients with MSI-H type. Comparing with MSI-H patients of LOCRC, the EOCRC patients with MSI-H presented a higher mutation frequencies of FGFBR2, PBRM1, RNF43, LRP1B, FBXW7, ATM and ARID1A. In addition, EOCRC patients were identified with higher tumor mutation burden, especially in the MSI-H type. PD-L1 expression calculated by tumor proportion score (TPS) was also elevated in EOCRC and correlated with MSI status.
6,541 studies on the registry are indexed under Colorectal Neoplasms; 1,667 are open to participants now.
This study's enrollment of 11,344 is above the median of 250 across 1,440 observational studies indexed under Colorectal Neoplasms.
Browse Colorectal Neoplasms studies →The First Affiliated Hospital with Nanjing Medical University is the lead sponsor of 568 studies on the registry; 317 are open to participants now.
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The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
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Histologically or cytologically confirmed
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Early-onset colorectal cancer
Late-onset colorectal cancer
MSI status
(I) MSI-High (MSI-H) if two or more mononucleotide markers in tumor tissue had size variations of ≥3bp compared to normal tissue; (II) MSI-Low (MSI-L) if a single mononucleotide marker in tumor tissue exhibited a size variation of ≥3bp compared to normal tissue; (III) Microsatellite Stable (MSS) if there were no size variations of ≥3bp in mononucleotide markers in tumor tissue compared to normal tissue.
Time frame: Through study completion, an average of 1 year
Copy-number variations (CNVs)
Copy-number variations (CNVs) were detected using CNVkit with default parameters. Depth ratios of above 2.0(tissue) and below 0.6 were considered as CNV gain and CNV loss, respectively.
Time frame: Through study completion, an average of 1 year
PD-L1 level
PD-L1 expression was evaluated using the Dako PD-L1 IHC 22C3 pharmDx kit (Agilent Technologies) in conjunction with the Dako Autostainer Link 48 system (Agilent Technologies). The assessment of PD-L1 expression included both the tumor proportion score (TPS) and the combined positive score (CPS).
Time frame: Through study completion, an average of 1 year
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Plan to share: No
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Ran from Jan 2003 to primary completion in Dec 2022, 239 months.
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This study is completed, as verified in Feb 2024. You cannot join it, but the record below documents what was studied.
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The First Affiliated Hospital with Nanjing Medical University →