TET1 and triple-negative breast carcinoma: In the case of solid tumors, a recent bioinformatic study reported elevated expression of TET1 in a subset of triple negative breast cancer cases in the Cancer Genome Atlas (TCGA; in comparison to normal breast tissue and hormone‐dependent tumors), which coincided with reduced methylation levels; in addition, TNBC cases with elevated TET1 expression levels and reduced methylation had worse prognosis.177