Purpose: According to the 2023 global cancer data, breast cancer is the most common malignant tumor among women in the world. Its occurrence and development is influenced by inflammation, nutrition, and immune status. Therefore, this study combines C-reactive protein (CRP), albumin, and lymphocyte, which can reflect the above states, to form the CRP-albumin-lymphocyte (CALLY) index, an indicator to evaluate its relationship with overall survival (OS) and disease-free survival (DFS) in breast cancer patients.
Patients and Methods: We retrospectively analyzed the clinical and follow-up data of 174 patients with breast cancer. The optimal cutoff for the preoperative CALLY index was identified by considering the area under the receiver operating characteristic curve; subsequently, the discriminatory ability of the cutoff was determined. The effect of the CALLY index on overall survival (OS) and disease-free survival (DFS) was analyzed using the Kaplan–Meier method and the Cox proportional hazards model. The CALLY index was calculated as: (Albumin × Lymphocyte)/(CRP × 10⁴).
Results: The cut-off value of the CALLY index was determined at 2.285. With a cut-off value of 2.285, patients were divided into two groups: those with CALLY < 2.285 and those with CALLY ≥ 2.285. CALLY Index ≥ 2.285 was associated with better survival outcomes. Multivariate Cox analysis showed that TNM stage and CALLY index were prognostic factors that affected OS and DFS.
Conclusion: The CALLY index is a new prognostic biomarker for breast cancer patients after surgery. This new CALLY index allows for suitable patients with a poor prognosis to receive postoperative adjuvant therapy.

Keywords: breast cancer, prognosis, CALLY index, survival