Rice bran arabinoxylan compound (RBAC) is gaining attention in the world of integrative oncology for its potential to support cancer patients. With mounting evidence suggesting its beneficial effects, RBAC might be a game-changer in cancer care. This article explores what RBAC is, its mechanisms of action, and its potential roles in improving treatment outcomes and quality of life for cancer patients.
What is rice bran arabinoxylan?
Rice bran arabinoxylan is a bioactive compound derived from rice bran. The processing typically involves fermentation with enzymes such as those from shiitake mushrooms (Lentinula edodes), which enhances its bioavailability and efficacy. The resulting compound is rich in polysaccharides and hemicellulose, which show immunomodulatory and anticancer properties in preclinical and clinical studies.
What are RBAC’s effects?
RBAC has a range of biological activities that make it a promising adjunct in cancer care. Its mechanisms include enhancing immune function, promoting cancer cell death, reducing oxidative stress, inhibiting tumour growth and metastasis, and improving the effects of conventional therapies like chemotherapy and radiotherapy.
Acts as an immune restorative
One of the most well-documented effects of RBAC is its ability to enhance immune function. Cancer often suppresses the immune system, weakening the body’s natural defences. Research shows that RBAC:
Stimulates the activity, but not the number, of natural killer (NK) cells, which play a critical role in targeting and destroying cancer cells.
Enhances the function of macrophages and T-cells, improving overall immune surveillance.
Increases cytokine production, boosting the body’s ability to fight cancer and infections.
(1)
Promotes apoptosis
Apoptosis, or programmed cell death, is a natural mechanism that eliminates damaged or abnormal cells. Many cancer cells evade this process, allowing uncontrolled growth. Researchers have found that RBAC can:
Induce apoptosis in various cancer cell lines.
Enhance the expression of pro-apoptotic proteins like Bax while inhibiting anti-apoptotic proteins like Bcl-2.
(1)
Acts as an antioxidant
As cancer cells grow, they produce high levels of Reactive Oxygen Species, which cause oxidative stress and deplete the body’s natural antioxidants. This harms the surrounding tissues. Cancer cells can adapt and thrive under oxidative stress, which contributes to tumour growth and progression. RBAC’s antioxidant properties help to:
Neutralise free radicals, reducing DNA damage and mutation risk.
Protect healthy cells from oxidative damage during cancer treatment.
Lower inflammation, which is often associated with cancer progression.
(1)
Stops cancer progression
Studies have shown that RBAC inhibits tumour growth and reduces the spread of cancer. Its anti-proliferative effects include suppressing the proliferation of cancer cells by inhibiting key signalling pathways.
Although the actual mechanism is unclear, one small human study has found that treatment with RBAC reduced the number of circulating cancer cells, which play a major role in metastasis (1).
Improves chemo effects
RBAC can enhance the effectiveness of chemotherapy by:
Increasing the sensitivity of cancer cells to chemotherapeutic agents. One study showed that the effects of RBAC and chemo drugs together were greater than either achieved alone.
Boosting immune responses that complement the cytotoxic effects of chemotherapy.
Reducing tumour resistance to drugs, a major challenge in cancer treatment.
(1)
Protects against chemo side effects
Chemotherapy often comes with significant side effects, including immune suppression, weight loss, fatigue, and gastrointestinal distress. RBAC helps to mitigate these issues by:
Supporting immune recovery.
Reducing weight loss and improving body weight recovery.
Reducing inflammation and oxidative damage.
Alleviating fatigue and improving overall energy levels.
Reducing gastrointestinal side effects.
In one study on breast cancer patients, in the group treated with RBAC, only 28% lost their hair compared with 100% of the control group.
(1)
Improves radiotherapy effects and reduces side effects
Radiotherapy is another cornerstone of cancer treatment, but it can damage healthy tissue. RBAC has shown promise in:
Enhancing the radiosensitivity of cancer cells, making radiotherapy more effective.
Protecting normal cells from radiation-induced damage.
Reducing side effects like fatigue, skin reactions, and gastrointestinal discomfort, and so improving quality of life.
(1)
Improves effects of other natural therapies
RBAC, in combination with other natural therapies, can amplify their effects. For instance:
It works in synergy with herbal remedies known for their anticancer properties, such as curcumin and mistletoe extract.
In combination with oncothermia, the application of low-radio frequency heat to tumours, RBAC improved the efficacy of it against chronic fatigue syndrome (CFS).
(1)
Safety considerations
RBAC is safe and well-tolerated, with only mild adverse effects reported in clinical trials, which included nausea and irritable bowel symptoms (2).
However, individuals with blood cancers should be cautious about its use. Because of its immunomodulation effects, there is a theoretical risk of overstimulation of the immune system that may pose risks in conditions such as leukaemia or lymphoma, which involve immune cell proliferation. Therefore, patients with these types of cancers should consult their oncologist or a healthcare provider before using RBAC.
Similarly, there may be interactions with immunosuppressive therapies, which are often used after organ transplants. Since their effects have to be finely balanced, you should consult your healthcare provider before using RBAC if you are currently taking these (3).
Those with autoimmune conditions like lupus, rheumatoid arthritis and multiple sclerosis should also use caution with it, as theoretically it could exacerbate their condition (3).
Other safety considerations include:
Potential allergies to rice or mushroom products.
There is limited safety data for pregnant or breastfeeding individuals.
As with any supplement, I strongly recommend that you consult a qualified natural health practitioner who will liaise with your oncologist to ensure RBAC is appropriate for your specific condition and treatment plan.
Dosages used in clinical trials are typically 1 gram daily for up to 12 months (3).
Conclusion
Rice bran arabinoxylan compound represents a promising natural adjunct for cancer patients, offering multiple benefits, from immune support to enhanced treatment efficacy and improved quality of life.
Its one drawback is its cost: it is not a cheap supplement. However, current evidence suggests that RBAC can be a valuable part of an integrative approach to cancer care.
If you found this article useful, sign up for the monthly newsletter you can sign up for my Cancer Treatment Support newsletter. You will receive a free booklet, Soothing Side Effects: A Natural Support Guide for Cancer Patients, as a thank you gift.
If you would also like information on on Cancer Prevention, you can sign up for a different newsletter covering that. As a thank you for signing up for that, you will receive a short recipe book, 30 Delicious Recipes for Cancer Patients.
For a more comprehensive collection of evidence-based natural strategies that can support you during cancer treatment and recovery, you need my book, Naturally Supporting Cancer Treatment. It brings together practical information about diet and lifestyle approaches, supplements, and herbs, including their potential benefits, risks and interactions with conventional cancer treatment.
References
Ooi SL, Micalos PS, Kim J, Pak SC. Rice Bran Arabinoxylan compound as a natural product for cancer treatment – an evidence-based assessment of the effects and mechanisms. Pharmaceutical Biology. 2024;62(1):367-393. doi:10.1080/13880209.2024.2349042
Natural Medicines Database. Rice Bran Arabinoxylan Compound Professional Monograph. NatMed Pro. February 17, 2021. Accessed January 13, 2025. https://naturalmedicines.therapeuticresearch.com/databases/food,-herbs-supplements/professional.aspx?productid=271#dosing.
Tönshoff B. Immunosuppressants in organ transplantation. van den Anker J, Schwab M, Kiess W, eds. Handbook of Experimental Pharmacology. Published online 2019:441-469. doi:10.1007/164_2019_331
