Circulating immunological complexes (KI) are one of the parameters of humoral immunity. The occurrence of KI was found in the course of neoplastic diseases both in animals and humans. They are formed as a result of interaction of neoplastic antigens with specific tumor antibodies. Immunological complexes may be favourable or unfavourable to the modulation of effector mechanisms directed against neoplastic cells. In spite of extensive research, the participation of KI in immunological neoplastic response has not been clearly defined. The quantitative analysis of KI in the serum of patients with neoplasms revealed that the levels of KI may correlate with the degree of the progression of the disease, which has been shown for example in malignant melanoma, embryonal neuroma and carcinoma of the breast. The investigation of KI in the serum of patients with cervical carcinoma is rarely reported. The present paper shows 71 patients with squamous epithelial cervical carcinoma in various stages of progression, patients not receiving therapy. The evaluation of KI was made by means of two methods: test of inhibition of forming rosettes EA and inhibition of forming rosettes EAC. The authors of the few reports on the subject agree (which was also confirmed in our research) that the serum of patients with cervical carcinoma reveals the presence of KI. The frequency of occurrence and levels of KI may correlate with the degree of progression of a neoplastic process.