We measured the mRNA levels of M1 markers (CD86, iNOS), M2 markers (CD206, Arg1), and inflammatory factors (TNF‐α, IL‐1β, IL‐6, IL‐10) in the corpus callosum using RT‐PCR at 14 days and 40 days after CCH. Here, TNF is linked to columnar cell hyperplasia of the breast.