ERBB2 and breast cancer: In contrast to the present study, percentages of γδ T cells within renal cell carcinoma fail to correlate with any prognostic features [47] and intratumoral γδ T cell numbers are positively correlated with advanced tumor stages, HER2 expression status, and high lymph node metastasis but inversely correlated with relapse-free survival and overall survival of breast cancer patients [48].