Bombesin plasma levels in patients with benign and malignant breast disease.

Some reports suggest a role for bombesin-like peptides in the pathology of breast tumors. Bombesin and related gastrin-releasing peptides have been shown to influence the inositol phospholipid signalling pathway and stimulate growth of some cells, including some human breast cancer cell lines. We measured the plasma concentration of bombesin in 23 breast cancer patients, 32 patients suffering from benign breast disease and in 21 healthy controls. The bombesin concentration in plasma taken from the thoracodorsal vein, in the vicinity of the tumor in breast cancer patients was higher than that in the peripheral circulation (mean +/- SEM, 91.3 +/- 54.3 vs. 40.9 +/- 27.4 pg/ml; p < 0.05). Bombesin concentrations in the cubital vein in breast cancer patients and in those with benign breast disease (61.7 +/- 49.3 pg/ml) was significantly higher than that in the control group (23.7 +/- 5.06 pg/ml; p < 0.05). Our findings suggest storage or synthesis of bombesin-like peptides within the affected breast and may confirm the role of these peptides in the growth of breast tumors.