I think I saw an article recently that said same, basically involution is a party for breast cancer cells.
"Expression of the Extracellular Matrix Protein Tenascin-C Varies During Lactation." Qin, W et al.
Breastfeeding Medicine Vol. 11, No.2, 2016 DOI: 10.1089/bfm.2015.0153
"Tenascin-C, a protein known to promote breast cancer progression, is expressed throughout lactation [higher in wean milk]
"The inverse correlation with TGF/2 in wean milk suggests a possible interaction during breast involution, which should be further investigated."
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