Estrone is an estrogen. It is produced by the ovaries or by adipose tissue. It can be made artificially, and is used to treat deficiency of estrogen and breast cancer.

Cíjīsùtóng shì yīzhǒng cíjīsù, yóu luǎncháo huò zhīfáng zǔzhī chǎnshēng; kě réngōng héchéng, yòngyú zhìliáo cíjīsù quēfázhèng hé rǔ'ái.