Cervical cancer screening
11. Management of glandular abnormalities
GUIDELINE UPDATES - This guideline was last updated 7/1/2022
Cervical adenocarcinoma is associated with human papillomavirus (HPV) infection and can be detected by HPV testing. HPV has been identified in an estimated 99.7% of cervical carcinoma specimens. While 70% of squamous cervical cancers are related to oncogenic HPV types 16 and 18 an estimated 78% of adenocarcinomas are related to these two types and the proportion associated with HPV 18 is greater than for squamous cell carcinomas. Glandular abnormalities are also associated with a substantial risk of cervical intraepithelial neoplasia grade 3 (CIN3) and cervical cancer; in a large US cohort, 33% of HPV-positive women with a conventional cytology finding of atypical glandular cells developed CIN3 or a higher-grade lesion (CIN3+) and 9% developed cervical cancer within 5 years. Among women with the same cytology finding in whom oncogenic HPV was not detected, 0.93% developed CIN3+ and 0.37% developed cervical cancer. Glandular and squamous lesions commonly coexist, with CIN found in approximately half of women with endocervical adenocarcinoma in situ (AIS). In Australia, adenocarcinoma accounts for approximately 25% of cervical carcinomas, while adenosquamous carcinoma accounts for approximately 4%. After an initial decrease from 2.8 new cases per 100,000 women in 1991, the incidence of adenocarcinoma has remained at around 2 new cases per 100,000 women.
Cervical screening based on cytology is less effective in preventing cervical adenocarcinoma than squamous cell carcinomas. Cervical cytology is less sensitive for the detection of glandular lesions than for the detection of squamous intraepithelial lesions and squamous cell carcinoma, due to sampling and interpretation issues. Primary HPV screening has been found to be more effective than cytology for the prevention of adenocarcinoma.
Cytological glandular abnormalities are also associated with polyps, metaplasia and adenocarcinomas of the endometrium, ovary, fallopian tube and other sites, which would not be detected through HPV based cervical screening. The detection and management of these conditions is outside the scope of this guideline.
The Australian Modified Bethesda System (AMBS 2004) for reporting glandular abnormalities recognises the following categories (see Chapter 3. Terminology):
- atypical endocervical cells of undetermined significance/atypical glandular cells of undetermined significance
- possible high-grade glandular lesion
Glandular abnormalities are uncommonly reported on cytology. In Australia, the finding of atypical endocervical/glandular cells of undetermined significance is reported in approximately 0.04% of cytology tests, possible high-grade endocervical glandular lesions in approximately 0.02–0.3%, AIS in approximately 0.01%, and adenocarcinoma in fewer than 0.01% of cytology tests.
Issues in the investigation and management of screen-detected glandular abnormalities differ from those for squamous abnormalities. These include the roles of HPV testing, colposcopy and endocervical sampling in the detection and investigation of cytological glandular abnormalities, and the optimal modality of excisional biopsy.
Colposcopy may detect minimal cervical changes in women with a cytological prediction of AIS. Colposcopy has a low sensitivity for detecting endocervical lesions, and women with endocervical glandular abnormalities on cytology have a significant cancer risk even when colposcopy is normal.
The use of endocervical sampling (by endocervical curettage or cytobrush) in the investigation of glandular abnormalities has been controversial (see Chapter. 7. Colposcopy). Endocervical brushing has higher sensitivity, is better tolerated, and produces fewer insufficient samples than endocervical curettage. However, grading may be more difficult for brush specimens. Although recommended for women with a cytology finding of atypical glandular cells in Canadian and European guidelines, endocervical curettage ECCis not frequently practised in Australia and its role has been controversial. It has little place in the management of women with a high probability of neoplasia, but might improve the chance of identifying a glandular lesion when cytology suggests a possible high-grade glandular abnormality. Guidelines for the pre-renewal National Cervical Screening Program (NCSP) advised that it could be considered as part of conservative management.
The use of excisional biopsy modalities other than cold-knife cone in the investigation of cervical glandular abnormalities remains controversial (see Modalities of treatment in Chapter 7. Colposcopy).
- Investigation of cytological glandular abnormalities
- Follow-up after excisional treatment for AIS
- Discussion: Management of glandular abnormalities
- A/Professor Lyndal Anderson — Co-author
- Professor Ian Hammond — Co-author
- A/Professor Selvan Pather — Co-author
- Mr. C. David H. Wrede — Co-author
- Professor Gordon Wright — Co-author
- Cancer Council Australia Cervical Cancer Screening Guidelines Working Party — Co-author
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WEBSITE UPDATES - This website was last updated 7/1/2022