IGHG1 and neoplasm: We found that expression levels of these three genes significantly and positively correlated with the abundance of CD38+ plasma cells in our TNBC samples (IGKC p < 0.0001, R = 0.647; IGHM p < 0.0001, R = 0.580; IGHG1 p < 0.0001, R = 0.655, Table S3 in Supplementary Material); and were associated with incrementally increasing DFS in multivariate analysis adjusted for tumor size, grade, age, and lymph node status (Table 5).