T47D, MDA-MB-486, MDA-MB-435s breast, LNCaP prostate and NCIH-838 lung cancer cell lines cultured in vitro were exposed to two concentrations of GHRH(1–29)NH2 and GHRH antagonists MZ-5-156, JMR-132 and MZ-4-71. Here, GHRH is linked to lung cancer.