Key points
- A 1999 pilot study by Doctors Nicholas Gonzalez and Linda Isaacs followed 11 patients with inoperable pancreatic cancer using high-dose pancreatic (proteolytic) enzymes, nutrition, and detoxification.
- At one year, 81% were still alive; at two years, 45% were still alive—higher than the survival rates reported at the time.
- The study was small and not randomized, yet it remains one of the clearest published looks at people who stayed with the protocol.
- While enzymes are not a substitute for medical care, they have a long history, a biological rationale, and continue to deserve a place in the conversation for those exploring additional support.
If you’ve read my book I Used to Have Cancer, you already know where I stand on enzymes. I have called them one of the best defense mechanisms we have. Yet search the phrases “pancreatic enzymes and cancer” or “systemic enzymes cancer” and you’ll find the idea almost missing from today’s headlines. It lives in older books and papers, then quietly disappears from the conversation.
I first heard about this work from the teachers I encountered on my personal road back to health after being diagnosed with stage 4 melanoma. More than a century ago, John Beard proposed that pancreatic proteolytic enzymes could act against cancer. Dr. William Donald Kelley later built a practice around high-dose pancreatic enzymes, diet, and detoxification. Doctors Nicholas Gonzalez and Linda Isaacs carried the method forward and published a pilot study in 1999—the study I still return to.
The Truth About Enzymes
Most of us only know enzymes as the little helpers that break down our food. But some enzymes have a much bigger job and offer a major defense against cancerous tumors.
In higher doses, pancreatic (proteolytic) enzymes have been used to help the body do extraordinary things, like breaking down abnormal proteins and influencing the area around a tumor. Practitioners and patients have looked at them as one possible way the body can better defend itself against cancer.
And believe me, that’s no small thing—especially when you’re staring death in the face, as I was, and searching for every legitimate tool that might help.
In their 1999 paper in Nutrition and Cancer, Gonzalez and Isaacs followed eleven patients with advanced, inoperable pancreatic cancer. The patients took large doses of pancreatic enzymes along with nutritional supplements, detoxification procedures, and an organic diet. Nine of the eleven (81%) were still alive after one year, and five (45%) were alive after two years. Four had survived three years. At the time, typical survival for this cancer was much lower—roughly 25% at one year and 10% at two years. The study was small and not randomized, but it still offers one of the clearest pictures we have of people who stayed with the enzyme protocol.
The Links Between Enzymes, Collagen, and Cancer
Cancer doesn’t grow in a vacuum. It grows in the tissue that surrounds it—the collagen, the proteins, and the local environment that either helps hold it in check or makes it easier for it to spread. Some practitioners call this surrounding environment the “terrain.” I’ve always been interested in that terrain, because it’s one of the places where the body still has a say.
Collagen and proteolytic enzymes both influence the terrain around a tumor. Healthy collagen can help create a stronger barrier that limits the spread of cancer, while enzymes work on the protein side of the problem. Nutrients such as vitamin C, lysine, and proline help strengthen that collagen matrix. Together, they offer a broader way of looking at how the body can be supported.
I wanted to hear more from Dr. Linda Isaacs, so we sat down for a deeper conversation about enzymes, coffee enemas, and the Beard theory of cancer. I asked many of the questions you might ask if you were sitting across from her yourself.
Watch Enzymes and Coffee Enemas for Cancer. It’s the next best thing to learning from an expert face-to-face in her clinic.
What Does This Mean for Me?
If you’re wondering whether pancreatic (proteolytic) enzymes belong in your own plan, the best next step is a conversation with an integrative practitioner experienced with this approach. You might ask:
- Do you use proteolytic or systemic enzymes with patients who have cancer, and which preparation and dose do you prefer?
- How do you time them around meals?
- What have you seen in people who stay consistent with them for several months?
- Are there any reasons I should be careful—such as bleeding risk, upcoming surgery, or interactions with what I’m already taking?
If you’d like to learn more about the enzyme-based nutritional approach that Dr. Linda Isaacs continues, visit her website at drlindai.com. You’ll find information on her method, published case reports, and how to reach the office. She does not give medical advice by email; the contact form and phone number are on the site.
Frequently Asked Questions
What are proteolytic enzymes?
Proteolytic enzymes break down proteins. In the Gonzalez–Isaacs approach, they are used in high doses and timed to work systemically (throughout the body), not just for digestion.
How is this different from regular digestive enzymes?
Digestive enzymes are typically taken with meals to help break down food. The enzyme protocol discussed here uses much higher doses of pancreatic proteolytic enzymes, often taken away from meals, with the goal of supporting the body beyond digestion.
What did the 1999 Gonzalez and Isaacs study show?
In their pilot study of 11 patients with inoperable pancreatic cancer, 81% were alive at one year and 45% at two years—higher than the survival rates reported for this cancer at the time. You can read the abstract on PubMed.
Are enzymes a cure for cancer?
Enzymes are one tool that some people and practitioners have explored as part of a broader supportive approach.
Are there any safety concerns?
Enzymes can increase bleeding risk. They are usually avoided before surgery and by people taking blood thinners. An experienced practitioner can help you decide whether they are appropriate for your situation.
Where can I learn more about Dr. Linda Isaacs’ work?
Visit drlindai.com for information on her method, published case reports, and how to contact the office.
Should I start taking proteolytic enzymes on my own?
It’s best to speak with a qualified integrative practitioner who has experience with this approach before adding enzymes, especially if you are currently under medical care.
Related:
Unleashing the Power of Enzymes in Fighting Cancer
This article is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare practitioner before making changes to your health regimen.
