KLK3 and ovarian cancer: At 1:100, PSA positivity was seen in additional 8 (total: 9 of 2,845, 0.3%) interpretable extraprostatic cancers, including another ovarian cancer, 3 osteosarcomas, 2 malignant mesotheliomas, and one case each of thyroid gland cancer and large cell lung cancer (Figure 5B–5E).