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In: Annual technical report, 1992, [of the] World Health Organization [WHO]. Special Programme of Research, Development and Research Training in Human Reproduction. Geneva, Switzerland, WHO, 1993. 63-78. (WHO/HRP/ATR/92/93)This document contains the 1992 Annual Report of the Task Force on [the development of safe, effective, reversible, and acceptable] Methods for the Regulation of Male Fertility of the World Health Organization's Special Programme of Research, Development, and Research Training in Human Reproduction. In the area of hormonal methods, the Task Force is currently concentrating its research activities on 1) the evaluation of the functional capacity of sperm produced by men who have been suppressed to severe oligozoospermia, 2) the development of testosterone buciclate as an injectable method and as replacement therapy for hypogonadal men, and 3) the development of second generation progestogens and new gonadotrophin-releasing hormone antagonists as gonadotrophin suppressing agents. The safety and acceptability of hormonal methods for men remain a concern and topic of research activities. As an alternative to hormonal methods, the Task Force is continuing its search for a drug with a reversible, post-testicular action on the normal function of sperm stored in the epididymis. An ideal preparation would be quickly effective and quickly reversible. Collaborative studies in China also continue to investigate the antifertility action of pure compounds isolated from the plant species Tripterygium wilfordii. During 1992, the Task Force also continued its support of studies on three methods of vas occlusion: the no-scalpel method, a chemical sterilization method, and the polyurethane-plug. The efficacy and reversibility of silicone vas occlusion also remains under study. A training workshop on vas occlusion methods was attended by 32 participants in Indonesia in April 1992, and the safety of vasectomy continues to be monitored by the Task Force. This report notes the state of research on inhibin isolated from porcine follicular fluid and on the possibility of an immunization approach based on a vaccine against follicle-stimulating hormone. Two projects supported in 1992 sought to identify sperm surface proteins as putative immunogens. The report ends by recounting its investigator initiatives, its collaborative research programs, and its efforts in the area of information distribution. A summary describes 10 areas in which substantial progress was made during 1992.