Overview Cancer of the fallopian tube is very rare, accounting for fewer than 1% of all cancers of the female genital organs. In this cancer, tumor develops from cells inside the fallopian tubes. It is much more common for a tumor to metastasize to the fallopian tube from either the ovary or endometrium than for a primary cancer to develop inside the fallopian tube. Even major medical centers may see no more than a handful of cases of fallopian tube cancer over several years. The majority of the cases are diagnosed in women age 50 and older.