Is prolactin inducible protein (PIP) protective against breast cancer?

"Researchers describe the first evidence linking prolactin inducible protein (PIP) to the immune system's ability to recognize and destroy foreign cells, such as tumor cells. New research in PIP-deficient mice that demonstrates the role of PIP in cell-mediated immunity and suggests that this immune regulatory function may be protective against breast cancer is presented in DNA and Cell Biology. 

Coauthors Olivia Ihedioha, Robert Shiu, Jude Uzonna, and Yvonne Myal, University of Manitoba, Winnipeg, Canada, describe the potential clinical implications of these findings, in which PIP could represent an effective new target for the development of novel immunotherapeutic agents. The researchers review their recent studies of PIP, known as a biomarker of mammary differentiation, in the article entitled "Prolactin-Inducible Protein: From Breast Cancer Biomarker to Immune Modulator—Novel Insights from Knockout Mice..."

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http://medicalxpress.com/news/2016-10-prolactin-protein-pip-breast-cancer.html