Toward a Clearer Understanding of the Prognostic Value of Health-Related Quality-of-Life Parameters in Breast Cancer

Quality-of-life concerns in lung cancer patients

Lung cancer is a leading cause of cancer deaths for both men and women across the world. In the past, studies on lung cancer have focused on traditional end points such as survival, disease-free survival or local control. More recently, investigators have begun to appreciate the importance of health-related quality-of-life outcomes, particularly in the setting of lung cancer. This article provides an overview of the importance, methodology, analysis and presentation of health-related quality of life in lung cancer trials, and also discusses some of the limitations and challenges of such studies.

Temporal patterns of fatigue predict pathologic response in patients treated with preoperative chemoradiation therapy for rectal cancer

PURPOSE

To investigate whether symptom burden before and during preoperative chemoradiation therapy (CRT) for rectal cancer predicts for pathologic tumor response.

METHODS AND MATERIALS

Fifty-four patients with T3/T4/N+ rectal cancers were treated on a Phase II trial using preoperative capecitabine and concomitant boost radiotherapy. Symptom burden was prospectively assessed before (baseline) and weekly during CRT by patient self-reported questionnaires, the MD Anderson Symptom Inventory (MDASI), and Brief Fatigue Inventory (BFI). Survival probabilities were estimated using the Kaplan-Meier method. Symptom scores according to tumor downstaging (TDS) were compared using Student's t tests. Logistic regression was used to determine whether symptom burden levels predicted for TDS. Lowess curves were plotted for symptom burden across time.

RESULTS

Among 51 patients evaluated for pathologic response, 26 patients (51%) had TDS. Fatigue, pain, and drowsiness were the most common symptoms. All symptoms increased progressively during treatment. Patients with TDS had lower MDASI fatigue scores at baseline and at completion (Week 5) of CRT (p = 0.03 for both) and lower levels of BFI "usual fatigue" at baseline.

CONCLUSION

Lower levels of fatigue at baseline and completion of CRT were significant predictors of pathologic tumor response gauged by TDS, suggesting that symptom burden may be a surrogate for tumor burden. The relationship between symptom burden and circulating cytokines merits evaluation to characterize the molecular basis of this phenomenon.

Validation of Patient's Self-Reported Social Functioning As an Independent Prognostic Factor for Survival in Metastatic Colorectal Cancer Patients: Results of an International Study by the Chronotherapy Group of the European Organisation for Research and Treatment of Cancer

Purpose

A recent study identified a prognostic model for survival in metastatic colorectal cancer patients which included WBC count, alkaline phosphatase (AP), number of metastatic sites, and patients’ self-reported social functioning. The aim of this research is to validate this model on data from an independent sample.

Patients and Methods

This validation study is based on a prospective randomized controlled trial in patients with metastatic colorectal cancer conducted by the European Organisation for Research and Treatment of Cancer (EORTC) Chronotherapy Group. Overall, 564 patients in 10 countries were enrolled. For the purpose of this independent validation, patients with health-related quality of life (HRQOL) baseline data were analyzed. HRQOL was assessed using the EORTC Quality of Life Questionnaire C30 (QLQ-C30). The Cox proportional hazards regression model was used for both univariate and multivariate analyses of survival.

Results

The previous model with an additional adjustment, by stratification for sex, was replicated and its parameters were confirmed to independently predict survival: WBC count with an hazard ratio (HR) of 1.31 (95% CI, 1.021 to 1.698; P = .034); AP with an HR of 1.53 (95% CI, 1.188 to 1.979; P = .001); number of sites involved with an HR of 1.90 (95% CI, 1.531 to 2.364; P < .0001); and patients’ self-reported social functioning with an HR of 0.94 (95% CI, 0.905 to 0.976; P = .001). The latter translates into a 6% increase in the likelihood of an earlier death for every 10-point decrease in the social functioning scale of the EORTC QLQ-C30.

Conclusion

This study provides confirmatory evidence of the independent prognostic value of patients’ self-reported social functioning in patients with advanced colorectal cancer.

Health-related quality of life as a valid outcome in the treatment of advanced colorectal cancer

With the recent trend of improved survival, there has been a marked interest in reviewing and refining the contribution of health related quality of life (HRQoL) outcome measures of treatment in advanced colorectal cancer. However, if HRQoL data are going to be of clinical value and help both physicians and patients make decisions there is a need for a consensus on both the design and methods of measurement of HRQoL in clinical trials, and an acknowledgement of the interpretation of the outcomes in clinical practice. Whilst it is encouraging to find that the quality of HRQoL measurement in clinical research has improved significantly over the last fifteen years, with a growing number of trial-based HRQoL studies, there is still the potential to improve the use of HRQoL in clinical decision making in advanced colorectal cancer. There is also the need to further refine measurement of HRQoL to provide useful data specific to these patients. It is anticipated that developments such as the liver metastases module EORTC (QLQ-LMC21) questionnaire will increase the sensitivity to change of the generic cancer measure, the EORTC QLQ-C30 and will provide essential HRQoL information regarding the use of treatments in both the curative and palliative settings. Furthermore, easy to use simple tools such as the "minimum standard checklist for evaluating HRQoL outcomes in cancer clinical trials" might be of help in guiding investigators on the basis of minimum criteria.

Quality-of-Life Outcomes in Oncology

QOL outcomes have become an integral component of many clinical oncology trials. Much work has been performed testing the validity and reliability of Q OL instruments. The current challenge is to understand better the clinical relevance of QOL research in oncology. QOL studies should focus on phase III trials with clear hypotheses that can lead to clinically meaningful interventions.

Does a patient’s self-reported health-related quality of life predict survival beyond key biomedical data in advanced colorectal cancer?

The purpose of this study was to determine whether baseline patients' self reported health-related quality of life (HRQOL) parameters could predict survival beyond key biomedical prognostic factors in patients with metastatic colorectal cancer. The analysis was conducted on 299 patients. HRQOL baseline scores were assessed using the European Organisation for Research and Treatment of Cancer, Quality of Life Questionnaire-Core30 (EORTC QLQ-C30). The Cox proportional hazards regression model was used for both univariate and multivariate analyses of survival. In addition, a bootstrap resampling technique was used to assess the stability of the outcomes. The final multivariate Cox regression model retained four variables as independent prognostic factors for survival: white blood cell (WBC) count with a hazard ratio (HR) of 1.961 (95% CI, 1.439-2.672; P<0.001), alkaline phosphatase with HR=1.509 (95% CI, 1.126-2.022; P=0.005), number of sites involved with HR=1.108 (95% CI, 1.024-1.198; P=0.01) and the patient's score on the social functioning scale with HR=0.991 (95% CI, 0.987-0.996; P<0.001) which translates into a 9% decrease in the patient's hazard of death for any 10 point increase. The independent prognostic importance of social functioning and the stability of the final Cox regression model were also confirmed by the additional bootstrap model averaging analysis, based on 1000 bootstrap-generated samples. The results suggest that social functioning, acts as a prognostic measure of survival beyond a number of previously known biomedical parameters.