About a month ago, my mother completed her last round of chemotherapy treatment for Stage 3 ovarian cancer. Her CA125 level was 17 after this final round of treatment. A few days ago she developed flu-like symptoms that she initially attributed to a virus. For peace of mind, she had her doctor run another CA125 test. The CA125 level was 429. Could such a drastic change in CA125 levels within a relatively short period of time indicate a reoccurance of cancer or is it more likely the result of some type of infection?