More than 40% of breast cancer survivors report persistent cognitive difficulties after the end of treatment — the so-called "chemo-brain" or oncologic fog. Impairments in memory, concentration, and processing speed directly affect quality of life and the ability to return to work. Data presented in December 2025 at the San Antonio Breast Cancer Symposium (SABCS) indicate that medical acupuncture may offer a concrete solution: in the phase II ENHANCE trial, conducted at Memorial Sloan Kettering Cancer Center (MSK) with funding from the National Cancer Institute (NCI/NIH), real acupuncture was the only intervention to surpass the threshold of clinical relevance both on subjective cognition and on objective cognition.
The study was presented by Dr. Jun J. Mao, MD, MSCE, of Memorial Sloan Kettering Cancer Center, and received extensive coverage from ASCO Post, Medscape, Drugs.com, and Oncology News Central. ENHANCE is a phase II randomized clinical trial with three parallel arms (2:1:1) that evaluated 260 women with breast cancer stages 0-III, already off active treatment, with mean age of 56.6 years. To be eligible, each participant had to report moderate or severe cognitive difficulties and also present insomnia — a profile that faithfully reflects the clinical complexity of the survivors seen in the office.
RESULTS OF THE ENHANCE TRIAL (SABCS, DECEMBER 2025)
Study Design and Interventions
The 260 participants were randomized in a 2:1:1 ratio to three groups: real acupuncture (n=129), sham acupuncture (n=70), and usual care (n=61). The real acupuncture group received weekly sessions for 10 weeks with insertion of needles at therapeutic points validated for cognition and insomnia. The sham group received the same number of sessions with a protocol that mimicked real acupuncture, but without skin penetration of the needles — a methodologically rigorous control that allows isolating the specific effect of acupuncture from the effect of attention and ritual of treatment. The usual-care group followed standard medical management without additional interventions.
Detailed Results: Subjective vs. Objective
On subjective assessment by the FACT-Cog scale at week 10, both real acupuncture (+10.3 points) and sham (+10.5 points) surpassed usual care (+4.8 points). Notably, both acupuncture groups crossed the minimum clinically important difference (MCID) threshold of 7.4 points — while usual care fell below this benchmark. This pattern persisted at week 26, confirming durability of benefits. The similarity between real acupuncture and sham on the subjective scale suggests a therapeutic-attention component, but does not invalidate the result — on the contrary, it reinforces that any acupuncture modality is superior to no treatment.
The most clinically relevant finding emerged on the objective assessment: on the Hopkins Verbal Learning Test–Revised, real acupuncture achieved statistically significant improvement at week 10, surpassing sham by four points. The sham group did not show objective improvement. In subgroup analysis, patients with documented cognitive impairment at baseline showed an even more pronounced trend of benefit with real acupuncture. This datum is critical: real acupuncture not only relieves the perception of cognitive fog, but produces measurable improvement in objective memory function.
Frequently Asked Questions
"Chemo-brain" (oncologic fog) is a cluster of cognitive symptoms — memory lapses, difficulty concentrating, slowed thinking — that affect more than 40% of breast cancer survivors after chemotherapy, radiotherapy, or hormone therapy. Mechanisms include neuroinflammation, mitochondrial dysfunction, and alterations in hippocampal circuits. Medical acupuncture acts on several of these mechanisms: it modulates neuroinflammation, regulates neurotransmitters (dopamine, serotonin, noradrenaline), improves cerebral microcirculation, and reduces cortisol — forming a multimodal approach that addresses real pathophysiologic causes, not just symptoms.
Not necessarily. The similarity between real acupuncture and sham on FACT-Cog (subjective scale) reflects the strong therapeutic-attention component present in any structured acupuncture consultation. However, the definitive datum is the Hopkins Verbal Learning Test–Revised (objective test): real acupuncture surpassed sham by +4 points (significant p), while sham showed no objective improvement. This demonstrates a specific biological effect of real acupuncture, independent of expectation. Additionally, the absence of objective improvement in the usual-care group confirms that benefits do not occur by simple spontaneous remission.
The most appropriate is a medical acupuncturist with experience in integrative oncology — preferably linked to an oncology service or who collaborates with the oncologist responsible for follow-up. The medical acupuncturist will perform a complete clinical assessment (detailed anamnesis, physical examination, review of cancer treatments performed) before proposing the acupuncture protocol, ensuring that the approach is safe and integrated with the global therapeutic plan.
Founded in 1989 by physicians trained at the University of São Paulo (USP) and specialized in China, CEIMEC is a Brazilian national reference in the teaching and practice of medical acupuncture. With more than 3,000 physicians trained over 35 years, it collaborates with HC-FMUSP and is recognized by the Brazilian Medical College of Acupuncture (CMBA/AMB).