A line was inadvertently omitted from the article "Giant-Cell Tumor of Bone: Analysis of Two Hundred and Eight Cases in Chinese Patients" by Sung et al. (64-A: 755-761, June 1982). On page 756, the second paragraph in the right-hand column should read as follows.
The histological features of the tumors were graded by a modification of the method of Dahlin et al. Instead of their three grades, we used five. Our most malignant designation, corresponding to their Type III, applied to fourteen tumors. We devided each of their other two categories into two subcategories. In the most benign two subcategories we had forty-seven and seventy cases, respectively, while in the intermediate category we had forty-four cases, four of them being more aggressive. Of the 208 tumors, thirty-three could not be graded.