A systematic review of observational studies looked at how a measurement called phase angle (PhA) relates to the health of adults with colorectal cancer. Phase angle is a way to assess nutritional status and body composition using bioelectrical impedance analysis. The review looked at data from 1,439 patients to see if this measurement could predict how well a patient might do during and after treatment.
The review found that lower phase angle values were consistently linked to worse clinical outcomes. Specifically, four studies showed that patients with low phase angle had shorter overall or progression-free survival. Additionally, four studies linked low phase angle to more complications after surgery, longer hospital stays, and more toxicity from early chemotherapy. In contrast, higher phase angle values were linked to better muscle mass and better nutritional status.
Because this was a review of observational studies, the results show a link rather than a direct cause. The evidence is also limited by differences in how the measurements were taken and the specific values used to define a low score. While phase angle could be a helpful tool for tracking a patient's health, more standardized testing is needed before it can be used as a standard tool in clinics.
