3.3 Comparison with outcomes of PMT in the extremity and trunk
The patient details were shown in Table 2. The rate of residual disease/local recurrence with low serum phosphate was significantly higher in cases at the head and neck (56%) compared with cases at the extremities and trunk (25%, 8 of 32, p = 0.048). Re-excision was performed in 25% of patients (2 of 8) with extremity or trunk tumors which is lower compared with that in the patients with head and neck tumors (80%, 4 of 5). At the last follow-up, the rate of biochemical remission without medication was similar in both groups (89% of the patients with head and neck tumors and 75% of patients with extremity and trunk tumors, p = 0.827). At the last follow-up, medical treatment was continued in one patient (11%, 1 of 9) with a head and neck tumor and eight (25%, 8 of 32) with extremity and trunk tumors.