The series of volumes entitled Biological Responses in Cancer: Progress toward Potential Applications will provide information on approaches through which the interaction between neoplastic and normal cells may be modified. Each annual volume will contain contributions in areas where significant progress has been made. Topics to be dealt with include immunologic and host defense systems, control mechanisms of cell and population growth, cell differentiation, and cell transformation. The regulatory mech sms controlling the interactions between normal and tumor cells may be immunologic in...