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Quality of life for cancer patients' relates directly to their survival rates

Mayo Clinic : 16 May, 2008  (Company News)
A study of cancer patients by Mayo Clinic researchers, working with the North Central Cancer Treatment Group (NCCTG), showed that those paients who feel better live longer.
The study results were released as part of the 44th Annual Meeting of the American Society of Clinical Oncology (ASCO).

Mayo Clinic cancer researcher and the study's lead author, Angelina Tan, said the results show quality of life is an independent factor in survival.

'Quality of life appears to affect the survival of cancer patients,' said Tan. 'If physicians can identify patients who are not doing well, they will be able to intervene and, we hope, improve not only their patients' sense of well-being, but also their length of life.'

The researchers compared overall survival with responses from 3,704 patients to one question - 'On a scale of 0 to 10, how would you rate your quality of life?' Patients had a variety of cancer types, and the question was asked during their participation in one of 24 different NCCTG clinical trials. The unifying factor for the patients was that all had late-stage disease. All results were converted to a 100-point scale.

The team found that baseline quality of life was a strong predictor of survival. They found a distinct difference when dividing patients by the median score of 83 (6.1 months increased survival time for those with scores greater than or equal to 83). The investigators also divided the group into those with scores of more than 50 and 50 or less, defining those in the 50 or less category as having clinically deficient quality of life.

In this analysis, the results were even more striking, with increased survival of 7.5 months for the non-clinically deficient patients. The investigators determined that these numbers were independent of performance status (a traditionally used survival prediction method evaluating a patient's ambulatory status).

The study is one of several similar quality of life studies that are being presented by Mayo Clinic researchers at the ASCO annual meeting.

'Quality of life research is a priority at Mayo,' said Jeff Sloan, PhD, a cancer researcher at Mayo and the study's primary investigator. 'While doctors know that a patient's quality of life is important, these studies show that measuring it is necessary and can predict how patients will do.'

Dr Sloan, Tan and their colleagues at Mayo Clinic and NCCTG hope current and future research will identify both how and when clinicians can best support their patients' feelings of well-being. For example, if the quality of life deficit was identified to be related to patient fatigue and emotional distress, interventions (pharmaceutical, psychosocial) could be offered to improve patient well-being.

'If quality of life deficits can be identified routinely in clinical practice, it will help patients,' said Tan. 'Physicians can address the issues leading to a decrease in quality of life, and ideally these interventions will extend survival.'

Other researchers included Paul Novotny; Judith Kaur, MD; and Jan Buckner, MD, all from Mayo Clinic. NCCTG researchers included Paul Schaefer, MD, Toledo Community Hospital Oncology Program, Toledo, Ohio; Philip Stella, MD, St Joseph Mercy Health System, Ann Arbor, Michigan; and John Kuebler, MD, Columbus Community Clinical Oncology Program, Columbus, Ohio.
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