Fallopian tube and primary peritoneal cancer

The fallopian tubes are two fine tubes connecting the ovaries to either side of the womb. The peritoneum is a thin double-layered membrane lining the tummy wall and covering the organs, with a little fluid between the layers. Cancer can start in either place, and the cells of high-grade serous type are the same in each.

Because a cancer found widespread within the pelvis and abdomen cannot always be traced to one starting point, the labels may depend on which site looks most involved. Doctors accept this overlap and focus on stage and cell type, as the treatment does not differ much.

Macmillan lists persistent bloating or a swollen tummy, lower abdominal or pelvic pain, and back pain. Other signs may include appetite change, feeling full quickly or altered bowel and bladder habit. Some people notice a build-up of fluid (ascites) that makes the abdomen tighten.

These features resemble many benign problems, such as irritable bowel syndrome, so new, persistent symptoms deserve a GP review rather than waiting to see whether they settle.

After an internal examination, the GP orders a CA125 blood test and an ultrasound. If the picture raises concern, the gynaecological cancer team arranges CT and may calculate a Risk of Malignancy Index score, a calculation combining scan findings, menopausal status and CA125. Samples of fluid or tissue are taken to confirm the type.

Genetic testing looks for inherited BRCA variants in the blood and for homologous recombination deficiency in the tumour. Macmillan stresses that HRD testing checks only the cancer cells and is not a test for gene changes passed through families.

Surgery aims to remove as much cancer as possible, and more than one operation may be needed if the disease has spread. Chemotherapy is usually carboplatin with paclitaxel, given before or after surgery, or alone if surgery is not suitable. Bevacizumab or PARP inhibitors such as olaparib can be used as maintenance treatment after a response to chemotherapy.

Macmillan also mentions stereotactic ablative radiotherapy (SABR) as an occasional option for isolated areas of spread. Where cancer returns, the next step depends on earlier treatment and how long ago it finished.

Fertility-sparing surgery exists for selected early-stage disease, and the NHS says the team will discuss fertility preservation options before treatment begins. Removing both ovaries brings on an immediate menopause, and menopausal symptoms are managed with specialist advice.

Follow-up involves regular check-ups with imaging and blood tests. Late effects can include bowel problems or fluid accumulation, and the team can arrange dietitian, physiotherapy and mental health input.