In ER-negative tumours -LSB- triple-negative breast cancer and human epidermal growth factor receptor @ ( human epidermal growth factor receptor @ ( HER@ ) positive ) -RSB- , presence of CD@ + T cells within the tumour was associated with a @ % -LSB- @ % confidence interval ( CI ) @ % to @ % -RSB- reduction in the hazard of breast cancer-specific mortality , and CD@ + T cells within the stroma with a @ % ( @ % CI @ % to @ % ) reduction in hazard .