Fig. 1

Comparison of the primary tumor, referral source, primary tumor evaluation at the time of consultation, and primary site in patients with unknown primary tumors between the early and late groups. A primary tumor of the early group, B primary tumor of the late group, C referral source of the early group, D referral source of the late group, E evaluation of the primary tumor of the early group, F evaluation of the primary tumor of the late group, G primary site in patients with unknown primary tumors of the early group, and H primary site in patients with unknown primary tumors of the late group