this invention comprises a method of immunization in which human chorionic gonadotropin vaccine antigens are incorporated into an inorganic salt / biopolymer complex using a simple manufacturing process . the resulting solid matrix is administered to human subjects in the form of microparticles . the method comprises suspending microparticles in an emulsion of a natural oil and water containing an adjuvant compound acceptable for human use and injecting a pharmaceutical dose of the suspension intramuscularly . the vaccine antigens are conjugates of peptide fragments of the beta subunit of hcg with a carrier protein , diphtheria toxoid . vaccine antigens delivered in this formulation are effective for eliciting antibodies in recipients for the treatment of cancer or hormone - related diseases .