CD8A and metastatic malignant neoplasm in the lymph nodes: Factors with P < 0.05 in univariate survival analysis were included in Cox multivariate analysis which identified 4 independent prognostic factors associated with prognosis: the PSS score (P = 0.015), lymph node metastasis (P = 0.015), intraoperative blood loss (P = 0.013), and CD8+ T lymphocytes (P = 0.001) (Table 6).