Topographical distribution of oestrogen and progesterone receptors in the human endometrium and Fallopian tube

The topographical distribution of oestrogen and progesterone receptors in the human endometrium and Fallopian tube was investigated by an immunocytochemical technique. A gradient of positively stained cells was observed: the highest oestrogen and progesterone receptor content was noted in the fundal part of the uterine cavity and the ampullar region of the Fallopian tube. The observed gradient is in keeping with biological and pathological events that occur in the human mullerian tract, e.g. fecundation, implantation and carcinogenesis.