Although the duration of hyperprolactinemia was sufficient to produce expressible galactorrhea in a majority of the participants, breast milk PTHrP levels increase with increasing duration of lactation [51-53] and women with longstanding prolactinomas and lactating women [20,33,34] are exposed to elevated prolactin levels for months, not days. The gene discussed is PTHLH; the disease is hyperprolactinemia.