<prompt> Which one of the following tumours involving the female genital tract has the WORST prognosis?Dysgerminoma in a 35-year-oldUterine choriocarcinoma in a 25-year-old with a recent history of molar pregnancyGranulosa cell tumour in a 40-year-oldSerous cystadenocarcinoma of the ovary in a 45-year-old  <response>: Serous cystadenocarcinoma of the ovary in a 45-year-old, Around 75 of serous cystadenocarcinoma of the ovary are in an advanced stage at the time of diagnosis. These tumours have a worse prognosis than any of the other tumours listed. 