Modulation of the antigenicity of amylase in cervical glandular atypia, adenocarcinoma in situ and invasive adenocarcinoma

The utility of immunocytochemistry in invasive adenocarcinoma of the cervix

OBJECTIVES

The purpose of the study was to evaluate the utility of immunocytochemistry in the management of cervical adenocarcinoma. Patterns of reactivity to various immunocytochemical markers were correlated with clinically known risk factors for recurrence.

STUDY DESIGN

A retrospective evaluation of 55 patients with invasive cervical adenocarcinoma was conducted. Monoclonal antibodies were generated against various human intermediate filament proteins and tested on fixed, paraffin-embedded tissue by the avidin-biotin complex immunoperoxidase method. Dako V9 antivimentin antibodies and two anticytokeratin antibodies, 35 beta H11 and 34 beta E12, were used. Polyclonal antibodies to carcinoembryonic antigen and antibodies to epithelial membrane antigen were used.

RESULTS

Of 55 patients, 50 (91%) had positive epithelial membrane antigen antibodies in tumor cells. Tissue from patients with cervical adenocarcinoma demonstrated positivity for 35 beta H11 antibodies in 46 of 53 patients (87%) and positivity for 34 beta E12 antibodies in 15 of 54 patients (28%). Vimentin antibodies were negative in all except one patient. Carcinoembryonic antigen-positive antibodies were detected in 37 of 55 patients (67%). This study also demonstrated consistent negative expression of vimentin in invasive cervical adenocarcinoma. Carcinoembryonic antigen expression rates were 50% and 75% for patients with small tumors (less than or equal to 2 cm) and large tumors (greater than 2 cm), respectively (p less than 0.01). Patients with carcinoembryonic antigen expression are at increased risk for recurrence and also sustain reduced survival potential.

CONCLUSIONS

Patients with cervical adenocarcinoma and carcinoembryonic antigen expression are at increased risk for recurrence. We speculate that immunocytochemistry may detect lymph node micrometastases otherwise unsuspected by conventional microscopy.

Minimal deviation adenocarcinoma (adenoma malignum) of the endocervix: a histochemical and immunohistochemical study of two cases

The histopathological diagnosis of minimal deviation adenocarcinoma (adenoma malignum) of the endocervix may be difficult. Two cases of minimal deviation adenocarcinoma (MDA) were examined using mucin histochemistry and immunocytochemistry with antibodies to epithelial membrane antigens (HMFG1, Ep1), low-molecular-weight cytokeratins (CAM 5.2), carcinoembryonic antigen (CEA), and alpha-amylase. The results were compared with those for normal endocervical glands. Reactivity for CEA in MDA was focal and would be unreliable for biopsy diagnosis. Both cases of MDA contained abundant neutral mucins and sialomucins, whereas sulfomucins were rarely detected; this pattern contrasted with that of normal endocervix. Neoplastic glandular epithelial cells in MDA consistently showed both luminal and cytoplasmic reactivity with Ep1 and HMFG1, whereas normal cervix showed luminal labeling only. Thus, mucin histochemistry and immunohistochemical detection of epithelial membrane antigens may distinguish between extremely well differentiated neoplastic glands in MDA and normal endocervical glands, and hence may aid diagnosis in biopsy specimens.