['A 64-year-old woman was diagnosed as suffering from ovarian cancer. At that time, in 1984, she was treated with chemotherapy and complete remission was achieved. The disease recurred 2.5 years later and chemotherapy was delivered again. The patient remained disease free for 9 years. At that point a routine blood examination revealed a high serum level of the marker CA-125. A second recurrence of ovarian cancer was assumed. Nonetheless, work up revealed that the rise in CA-125 was related to the presence of a non-Hodgkins lymphoma (NHL).'] Are [ Rising CA-125 levels in a patient with ovarian cancer always indicative of disease recurrence ]?