Early treatment of little help to cancer relapse sufferers
Starting treatment early for an ovarian cancer relapse based on CA125 blood levels alone does not improve overall survival, compared with delaying treatment until symptoms arise, research has revealed.
CA125 levels are a marker of growth for several cancers including ovarian cancer and are measured by a blood test. Women who have undergone treatment for ovarian cancer may have their CA125 levels tested as often as every three months for several years after initial treatment.
In this study, Medical Research Council and National Cancer Research Institute investigators compared overall survival between 265 women with ovarian cancer in remission after initial chemotherapy who began second-line chemotherapy after a rise in CA125, and 264 women with rising CA125 whose treatment was delayed until symptoms of relapse appeared (such as pelvic pain or bloating).
Even though the early treatment group started second-line chemotherapy an average five months before the delayed treatment group, overall survival was the same between both: 41 months since completion of first-line chemotherapy.
Lead author Dr Gordon Rustin, MRC professor of oncology at Mount Vernon Cancer Centre in Hertfordshire, said: “Women who’ve completed ovarian cancer treatment often worry about a relapse, and they undergo frequent blood tests for CA125 in the hope of catching it early.”
“We thought that delaying chemotherapy might make overall quality of life worse due to the symptoms of ovarian cancer but this was not seen in women on this trial. Since there is no benefit from early chemotherapy, patients may choose to avoid the inconvenience and anxiety associated with frequent retesting for CA125 levels as well as unnecessary early initiation of treatment for relapse.”
The researchers added that this trial provides important information that will help women make informed choices about their follow-up and treatment. They can be reassured that treatment can safely be delayed until symptoms develop.
The paper, A randomized trial in ovarian cancer of early treatment of relapse based on CA125 level alone versus delayed treatment based on conventional clinical indicators, was presented at the Annual Meeting of the American Society of Clinical Oncology (ASCO). It will appear in a peer-reviewed publication later this year. More information is available on the MRC CTU website.
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