Cytoreductive Surgery(CRS) Plus Hyperthermic Intraoperative Peritoneal Chemotherapy(HIPC) With Cisplatin to Treat Peritoneal Carcinomatosis From Upper Gastrointestinal Cancer

ASSESSMENT of TUMOUR BURDEN • Tumour burden will be assessed using diagnostic imaging modalities and verified by surgical or laparoscopic evaluation before CRS+HIPC

• Primary tumour Biliary adenocarcinoma

  • Intrahepatic cholangiocellular carcinoma \< 3 cm in diameter
  • Extrahepatic cholangiocellular carcinoma without invasion of major blood vessels (portal vein, hepatic arteries, coeliac trunk) Gastric adenocarcinoma Macroscopic surgical margin of 5 cm is needed to obtain complete tumour removal Pancreatic adenocarcinoma Tumours located in the head, body or tail of the pancreas without portal hypertension due to complete encasement of mesenteric/portal vein and collateral venous circulation

• Liver metastases

  • Only liver metastases with stable disease or clinical response to prior systemic therapy for a period of at least 3 months are eligible
  • Not more than 3 metastases, each measuring 3 cm or less in diameter
  • Solitary liver metastasis smaller than 5 cm in diameter located in the periphery of ventral segments (Sg 2-6)

• Peritoneal metastases

  • Sugarbaker's peritoneal cancer index (PCI) will be used to assess peritoneal tumour burden 28. The completeness of cancer resection (CCR) will be assessed by the surgeon at the end of CRS; CCR-0 no macroscopic residual tumour, CCR-1 no residual tumour nodules greater than 2.5 mm, CCR-2 residual tumour nodules larger than 2.5 mm in diameter.
  • Patients with PCI \< 20 are eligible for this study 11.

THERAPEUTIC INTERVENTION

• CRS is defined as macroscopic tumour removal using surgical resection and/or LAT

  o Primary tumour Biliary adenocarcinoma

• Intrahepatic cholangiocellular carcinoma

  • Deep parenchymatous tumours are treated by LAT
  • Superficial peripheral tumours are treated by resection or LAT
  • Distance between tumour and major biliary structures (right, left, main hepatic duct) needs to be > 1 cm
• Extrahepatic cholangiocellular tumours are treated by surgical resection and biliodigestive reconstruction
• Distal cholangiocellular tumours with intrapancreatic location are treated by pancreaticoduodenectomy or LAT at 90°C
• Lymph nodes around the hepatoduodenal ligament are removed Gastric adenocarcinoma
• Partial gastrectomy can be performed either by proximal or distal gastrectomy dependent on tumour location and size
• Total gastrectomy is performed in patients with signet-ring cell cancers or linitis plastica
• Tumour-draining lymph nodes are removed Pancreatic adenocarcinoma
• Tumours located in the head of the pancreas and with radiologic or macroscopic vascular invasion, which need vascular reconstruction at the time of surgery, are treated by LAT at ablation temperature of 90°C
• Tumours located in the head of the pancreas without radiologic or macroscopic vascular invasion are treated by pancreaticoduodenectomy or LAT at 90°C
• Tumours located in the body or tail of the pancreas are treated by resection or LAT of 90°C

• Tumour draining lymph nodes are removed

  o Liver metastases

• Tumours up to 3 cm are treated by LAT (RFA or MWA)
• Solitary tumour measuring 3 - 5 cm is treated by resection

• Superficial peripheral liver metastases (any diameter up to 5 cm) are allowed to be resected

  o Peritoneal metastases

• Peritonectomy, electrofulguration of superficial (\< 3mm depth) metastases, and organ resection are allowed
• HIPC is administered immediately after CRS: cisplatin at a dose of 100 mg/m2 is dissolved in 3 litres of normal saline heated to less than 41° Celsius and infused into the abdominal cavity for a sustained hyperthermic intraperitoneal chemotherapy for 60 minutes. Surgical reconstruction (anastomoses) is performed after HIPC.

TRANSLATIONAL RESEARCH

1. Perioperative quantification of peritoneal and circulating tumour cells

   • Real-time qRT-PCR based on detection and quantification of CEA and EpCAM mRNA transcripts
   • Circulating tumour cells in peripheral blood samples will be studied before and at the end of surgical procedure (CRS+HIPC)
   • Peritoneal tumour cells will be evaluated in lavage fluid at the start of surgery (before any manipulation) and at the end of CRS+HIPC

2. Perioperative systemic cytokine profiles and lymphocyte immunophenotyping

   • Plasma concentration of cytokines will be determined using the BDTM Cytometric Bead Array (CBA): IL-1β, IL-2, IL-6, IL-8, IL-10, IL-12p70, IL-13, IFN-γ, and VEGF
   • The relative proportions and absolute numbers B-lymphocytes (CD19+), T-lymphocytes (CD3+), NK cells (CD56+CD3-), effector T cells (CD3+CD4+ and CD3+CD8+), HLA-DR+ T cells (CD3+HLA-DR+) and regulatory T cells (CD3+CD4+25+127low) will be quantified with flow cytometry.
   • Time-points for cytokine and immunophenotyping analyses: before surgery (d-1), at the end of surgery (d0), day after (d1) and at day 7 following CRS+HIPC

3. Gene-expression of primary and metastatic pancreatic cancer

   • To better understand cancer biology and search for novel diagnostic and therapeutic targets, fresh tissue samples from the primary tumour and from metastases will be stored in RNA-later for RNA-extraction and future analyses. Hereto, samples obtained from biliary, gastric, and pancreatic cancer tissue will be stored. Based on the fact that pancreatic cancer is associated with the worst prognosis, and based on our ongoing research on this disease, gene expression studies in the current project will be focused on pancreatic cancer.
   • In close collaboration with the department of pathology, we have stored snap-frozen tissue samples from surgically resected human pancreatic cancer for future research. Clinical, histopathological, and survival data of over 200 patients are registered in our database. Tissue samples (primary and metastases) from the current study will be analysed together with available 96 primary tumour samples that have already been controlled to be representative for high quality RNA studies. These samples are obtained from patients with early and advanced localized pancreatic cancer in various tumour stages. Gene-expression studies will be performed using Affymetrix HG U133 Plus 2.0 arrays on primary and metastatic tissue samples. These experiments will be conducted in close collaboration with the microarray facility of VIB at KUL.