Other studies also reported no change in PRL levels in response to food intake, including a study by Goettler et al., who reported unchanging PRL levels postprandially in a group of women with stage 1 breast cancer and the controls, although a significant rise in postprandial serum PRL levels was seen in stage II breast cancer patients, possibly due to increased levels of stress [21]. This evidence concerns the gene PRL and breast carcinoma.