Recruitment by the use of mass mailings.

Mass mailing represents a moderate-volume, low-efficiency recruitment strategy with a relatively moderate volume of initial contacts and low volume of entries, a low ratio of entries to initial contacts, and a relatively moderate effort level requirement for the recruitment team. In the CPPT, this source provided 6% of initial contacts, 7% of first protocol visits and 6% of entries. Although seven centers used mass mailing, 65% of total entries from this source were accounted for by the Oklahoma LRC.