Early cervical cancer and fertility-sparing surgery

FIGO 2018 defines stage IA as microscopic invasion up to five millimetres and stage IB as a visible or deeper tumour confined to the cervix, split into IB1 (up to two centimetres), IB2 (two to four centimetres) and IB3 (over four centimetres, treated as locally advanced). Squamous carcinoma and HPV-associated adenocarcinoma behave similarly at this stage, while HPV-independent gastric-type adenocarcinoma is more aggressive. Diagnosis comes from colposcopic biopsy or an excisional cone after abnormal screening, and MRI and PET-CT stage the tumour and nodes. Stage IA1 without lymphovascular invasion is treated by cone biopsy or simple hysterectomy alone; IA2 to IB2 has traditionally required radical hysterectomy with pelvic lymphadenectomy, followed by chemoradiation when nodes, margins or parametria are involved.

Two trials have reshaped the surgery. LACC randomised women with stage IA1 with lymphovascular invasion to IB1 disease between minimally invasive and open radical hysterectomy and stopped early when disease-free survival at four and a half years was 86.0 percent with keyhole surgery against 96.5 percent with open surgery, and deaths were more frequent; open surgery became the standard again and guidelines reversed a decade of practice. SHAPE then asked the opposite question for the lowest-risk tumours: in stage IA2 to IB1 disease up to two centimetres with limited stromal invasion, simple hysterectomy was non-inferior to radical hysterectomy for pelvic recurrence and caused far fewer urinary and sexual complications, so simple hysterectomy is now an accepted option for these women. Sentinel node biopsy, validated for detection in SENTICOL I and II, is being tested against full lymphadenectomy in SENTICOL III.

Fertility-sparing surgery follows the same logic. Cone biopsy or simple trachelectomy suffices for IA1 and selected IA2 tumours, and radical vaginal or abdominal trachelectomy with node assessment preserves the uterus in IB1 tumours up to two centimetres, with recurrence rates comparable to hysterectomy and live births in a majority of women who try to conceive, though preterm delivery is common. Neoadjuvant chemotherapy to shrink tumours of two to four centimetres before trachelectomy is investigational. HPV vaccination and HPV-based screening are shrinking this whole group of patients, which is the ultimate aim.