Preventing Unnecessary Operations: 1 Liter of Pineapple Juice and Advanced MRI Technology

A Historical Transformation: From "Hopeless" to "Treatable"

For many years, colorectal cancer spreading to the abdominal lining—the peritoneum—was considered a medical endpoint. These patients received palliative systemic chemotherapy and were thought to have no surgical option. Peritoneal metastasis meant tumor scattered throughout the abdominal cavity, an area regarded as beyond the surgeon’s reach.

Over the past 20-30 years, however, surgical techniques pioneered by Paul Sugarbakeroverturned this paradigm. Cytoreductive Surgery (CRS) combined with Heated Chemotherapy (HIPEC)substantially extended survival in selected patients and even achieved complete recovery—a cure—in some. Peritoneal metastasis could now be managed as regional rather than widespread systemic disease.

The Major Dilemma: Who Should Have Surgery?

This revolutionary treatment (CRS + HIPEC) is among the most demanding and complex operations in surgical oncology. It lasts hours and can involve removing part of the bowel, the gallbladder, spleen, or the entire peritoneum. Thus, "selecting the right patient" is vital.

When tumor burden is too high—a high Peritoneal Cancer Index (PCI)—this major operation offers no benefit and instead harms quality of life. Surgeons' greatest fear is operating in hope of cure, opening the abdomen, finding disease too extensive to remove, and closing without being able to help. This is called "futile surgery" in medicine.

Seeing the Unseen: The Limits of CT

How can we tell beforehand who is suitable? Standard computed tomography (CT) shows liver or lung metastases well but falls short at detecting millimeter-sized tumors on the peritoneum, as small as rice grains or lentils.

Surgeons therefore first have to perform diagnostic laparoscopy —an operation using a camera—simply to look inside and assess disease extent. This means an additional procedure, anesthesia, and lost time. The DISCO Studyaddressed this problem by asking whether imaging alone could reveal the true extent without surgery.

The 1-Liter Pineapple Juice Rule

Dr. Max J. Lahaye of the Netherlands Cancer Institute explains: "We ask patients to drink 1 liter of store-bought pineapple juice before MRI. Pineapple juice contains high levels of manganese . This metal makes fluid in the bowel contents appear completely black on MRI—a negative contrast effect. With bowel contents darkened, bright tumors stand out like stars in the night sky."

Standard Approach

In 42.5% of patients, surgery revealed disease too extensive to remove (inoperable), resulting in futile surgery (opening and closing without resection).

DW-MRI Group

With MRI assessment, this rate fell to 26.8%. The reduction was even more pronounced in the Dutch cohort, from 59% to 22%.

One of oncology’s most important principles is "primum non nocere"—first, do no harm. Subjecting someone to major surgery without benefit unnecessarily prolongs recovery and delays systemic treatment such as chemotherapy.

This study shows how advanced technology—MRI—and a simple food—pineapple juice—can combine to become a surgeon’s third eye. Peritoneal Cancer Index (PCI) assessment using MRI will protect patients from unnecessary surgical trauma and allow teams to focus on those who will truly benefit.

We believe advanced MRI before surgery will become standard for every patient with suspected peritoneal metastases.