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The discovery of cell-free circulating tumor DNA (crDNA) in blood and the maturation of technologies for ctDNA analysis have presented an attractive opportunity for minimally invasive "liquid biopsy" genomic diagnostics. The investigators plan to perform EUS-guided portal vein and hepatic vein aspiration in GI cancers patients. The aim of the current study is thus to examine the concentration of ctDNA in portal vein (EUS-guided PVA), hepatic vein (EUS-guided HVA) and peripheral blood to understand the first pass effect of the liver with gastrointestinal (GI) cancers, and the possibility of using ctDNA as a marker for preoperative staging, restaging after neoadjuvant chemotherapy, and monitoring for recurrence.
The discovery of cell-free circulating tumor DNA (crDNA) in blood and the maturation of technologies for ctDNA analysis have presented an attractive opportunity for minimally invasive "liquid biopsy" genomic diagnostics. The investigators plan to perform EUS-guided portal vein and hepatic vein aspiration in GI cancers patients. The aim of the current study is thus to examine the concentration of ctDNA in portal vein (EUS-guided PVA), hepatic vein (EUS-guided HVA) and peripheral blood to understand the first pass effect of the liver with gastrointestinal (GI) cancers, and the possibility of using ctDNA as a marker for preoperative staging, restaging after neoadjuvant chemotherapy, and monitoring for recurrence.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| EUS-guided PVA and HVA | Experimental | Patient will undergo EUS-guided PVA and HVA |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| EUS-guided portal vein and hepatic vein aspiration | Diagnostic Test | EUS-guided portal vein and hepatic vein aspiration |
|
| Measure | Description | Time Frame |
|---|---|---|
| Variant allelic fraction (expressed in %) of serum ctDNA from HVB, PVB and peripheral blood | Plasma DNA will be extracted using the QIAamp Circulating Nucleic Acid Kit (Qiagen), and the concentration of the circulating tumor DNA will be reported in variant allelic fraction (expressed in %) | 3 months |
| Measure | Description | Time Frame |
|---|---|---|
| Variant allelic fraction (expressed in %) of Genomic and proteomic analysis of ctDNA | If ctDNA is identified, further genomic and proteomic analysis will be performed. It will be measured in terms variant allelic fraction (expressed in %) | 3 months |
| Staging of the GI cancer |
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Inclusion criteria:
Age >= 18 years old
Newly diagnosed stage II-IV distal gastric cancer, pancreatic cancer or colorectal cancer
Undergoing treatment with either:
Surgery
Neoadjuvant chemotherapy
Neoadjuvant chemoirradiation
Palliative chemotherapy/ immunotherapy
Exclusion criteria:
Synchronous cancer of other sites
Cardia, high lesser curve tumors, oesophagogastric junction tumors
Presence of bulky lymph nodes at lesser curve/ coeliac region precluding a clear EUS puncture site to portal vein and hepatic vein
Patients with coagulopathy (international normalized ratio >1.3, partial thromboplastin time greater than twice that of control), platelet count <50,000x103/uL
Patients unwilling to undergo follow-up assessments
Patients with liver cirrhosis, portal hypertension and/ or gastric varices
Patient refusal to participate
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Shannon Chan, FRCSEd | Contact | 852-35052627 | shannonchan@surgery.cuhk.edu.hk |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| The Chinese University of Hong Kong | Recruiting | Hong Kong | Hong Kong |
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| ID | Term |
|---|---|
| D009360 | Neoplastic Cells, Circulating |
| D005770 | Gastrointestinal Neoplasms |
| ID | Term |
|---|---|
| D009362 | Neoplasm Metastasis |
| D009385 | Neoplastic Processes |
| D009369 | Neoplasms |
| D010335 | Pathologic Processes |
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The pathological TNM staging of the resected specimen will be recorded. |
| 3 months |
| Recurrence | any recurrence of the tumor will be recorded | 5 years |
| Overall survival | overall survival will be recorded | 5 years |
| Progression-free survival | progression free survival will be recorded | 5 years |
| Technical success rate of EUS-PVA and HVA | The technical success rate of the EUS guided procedure will be recorded. Reasons for failure of the cases will be recorded. | 1 day |
| Adverse events of EUS-PVA and HVA | the adverse events of the EUS procedure will be recorded | 30 days |
| D013568 |
| Pathological Conditions, Signs and Symptoms |
| D004067 | Digestive System Neoplasms |
| D009371 | Neoplasms by Site |
| D004066 | Digestive System Diseases |
| D005767 | Gastrointestinal Diseases |