Paul had his surgery. Caroline says that his PCI level is very high, sadly.
This is what I found about it:
What is the PCI score?
The peritoneal cancer index or
PCI score is used to quantify the extent of peritoneal cancer spread for pseudomyxoma peritonei (PMP) and other peritoneal surface malignancies. It provides an objective measure of overall tumour burden to help guide treatment decisions and predict prognosis.
About the PCI Score
The abdomen and pelvis are divided into 13 regions. Each region is assigned a score of 0 (no tumour), 1 (tumour 1-5 mm), 2 (tumour 5-25 mm), or 3 (tumour >25 mm). Scores are added for each region to get a total PCI.
A lower PCI, around 10-20, indicates limited disease spread and is associated with a better prognosis. These patients are optimal candidates for cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (CRS/HIPEC).
A PCI of 20-30 still represents potentially resectable disease for some patients. Neoadjuvant chemotherapy may be used before CRS/HIPEC to help shrink the tumour volume. Outcomes begin to decrease more rapidly above a PCI of 25.
A PCI above 30-40 typically means the cancer has spread too extensively throughout the peritoneum to be fully resected surgically. Palliative management focusing on symptom relief usually provides the best option at this point rather than cure-directed treatment.
Some studies use PCI categories of: 0-10 (very limited), 10-20 (limited), 20-30 (moderate), and over 30 (extensive). These provide a simplified way of stratifying patients into prognosis groups to help guide treatment decisions and set goals.
Changes in PCI over the course of treatment and follow-up indicate how well the cancer is being controlled. A declining PCI shows the therapy is working, while a rising PCI suggests progressive disease and treatment failure. Close monitoring PCI is used to detect recurrence early.
Retreatment like repeat CRS/HIPEC may be options if PCI increases after initial definitive treatment but still remains within a potentially resectable range, especially if good response was seen initially. Multiple procedures are sometimes needed over the course of management and survivorship.