Breast Cancer Patients Choosing Alternative Medicine Face Four Times Higher Mortality

A nationwide U.S. study published in JAMA, analyzing data from 2.15 million women with breast cancer, found that choosing complementary and alternative medicine (CAM) instead of evidence-based therapy was associated with sharply worse survival. Use of CAM alone was linked to a nearly fourfold increase in mortality risk, while combining CAM with standard treatment was also associated with higher mortality.

Over the past decade, especially through social media, complementary and alternative medicine (CAM) has gained much greater visibility, raising serious concerns for cancer patients. Practices such as herbal supplements and acupuncture are often presented as natural solutions for cancer. However, a new nationwide analysis suggests that when these approaches replace evidence-based breast cancer treatments, the consequences can be serious, with mortality risk rising nearly fourfold.

A large cohort study published in JAMA Network Open analyzed outcomes among more than 2.15 million women with breast cancer recorded in the U.S. National Cancer Database between 2011 and 2021. The investigators examined how survival differed depending on treatment choices, comparing patients who received conventional therapy with those who used CAM alone, CAM in combination with standard treatments, or no treatment at all.

A rare choice, but a consequential one

Most patients followed evidence based care. Approximately 97.6 percent received conventional treatment, which may include surgery, chemotherapy, radiation therapy, endocrine therapy, or immunotherapy. However, a very small minority chose alternative pathways. Fewer than 0.1 percent relied exclusively on CAM, and another 0.1 percent combined CAM with standard treatment. About 2.3 percent received no treatment.

Although these numbers appear small, the survival differences were striking. Five year survival among patients treated with conventional therapy reached about 85.4 percent. In contrast, patients who relied solely on CAM had a five year survival of 60.1 percent. Statistical modeling showed that CAM only use was associated with a nearly fourfold increase in mortality risk compared with standard treatment, adjusted hazard ratio 3.67.

Patients who declined all treatment had a similarly elevated risk, hazard ratio 3.53. In practical terms, outcomes for women choosing CAM alone were close to those who received no therapy at all.

The hidden effect of combining CAM with standard therapy

The study also examined a less discussed scenario, patients who combine alternative therapies with conventional oncology care. At first glance, this approach might appear harmless. However, the analysis revealed an important pattern.

Patients who used both CAM and standard therapy were significantly less likely to receive certain evidence based treatments. For example, in stage II breast cancer, only 40.7 percent of patients in the combination group received endocrine therapy compared with 65.2 percent among those treated exclusively with conventional therapy. Radiation therapy was also less frequently administered.

This treatment gap translated into measurable survival differences. Even after adjustment for age, cancer stage, comorbidities, socioeconomic factors, and treatment setting, patients using both CAM and standard therapy had a higher mortality risk than those receiving conventional therapy alone, adjusted hazard ratio 1.45.

Why patients turn to alternative approaches

The motivations behind CAM use are complex. Prior studies indicate that patients often seek these therapies to improve quality of life, reduce treatment side effects, or strengthen the immune system. Sociocultural factors also play a role, including holistic health beliefs, distrust in healthcare systems, and barriers to accessing medical care.

Younger age and higher educational attainment have also been associated with CAM use. In some cases, patients pursue these approaches quietly, without discussing them with their oncology teams. Surveys in breast cancer populations have suggested that up to 30 percent of patients experiment with alternative therapies at some point during their treatment journey.

Integrative care versus therapeutic substitution

Importantly, the study does not argue that all complementary practices are harmful. Some CAM modalities, such as acupuncture, massage therapy, and mindfulness based interventions, are increasingly studied for symptom management and supportive care. These approaches can help address pain, fatigue, anxiety, or treatment related side effects.

The critical distinction lies in whether these therapies are used as supportive measures or as substitutes for established cancer treatment. The study’s authors argue that replacing proven therapies with unproven alternatives carries significant risk.

About Author: Hüseyin Kandemir

As a medical journalist with over 20 years of experience, I have served as an Editor and Reporter for various magazines, newspapers, and online broadcasting platforms, consistently demonstrating a strong commitment to excellence in journalism. My specialization includes medical science, digital health, AI for health, data science, and biotechnology.