In a paper appearing in Lancet Oncology, researchers representing the European Organisation of Research and Treatment of Cancer (EORTC), the European Association of Nuclear Medicine (EANM), the European Society of Radiology (ESR), and the United States National Cancer Institute (NCI) laid the foundation for discussions aimed at improving the implementation and utilisation of imaging biomarkers in cancer clinical trials.

Dr Yan Liu (photo), Head of the EORTC Translational Research, Radiotherapy, and Imaging Department and also lead author of this paper, says "In cancer clinical trials, we are always trying to strike the right balance between maximising data quality and minimising cost. Here, risk management can be an extremely helpful tool, because it can help us to prioritise, reduce costs, and decrease attrition rates. In our study, we used a quality risk management approach to help us outline a consensus framework for imaging biomarker driven trials. This approach recognises that other stakeholders such as regulatory bodies, pharmaceutical companies, and patients also play essential roles in the conduct of these trials."

"Over the past several years, molecular and functional imaging tools have advanced to the point where it is now widely used in cancer clinical research," says Dr Lalitha Shankar of the US National Cancer Institute, Clinical Trials Branch, Cancer Imaging Program.

"Currently, RECIST, Response Evaluation Criteria In Solid Tumours, is the most commonly used criteria for the assessment of treatment response. But molecular and functional imaging can provide valuable information on disease staging as well as characterisation and potentially allow detection of response or non-response within days of the onset of treatment."

Prof. Nandita Desouza of the Institute of Cancer Research Royal Marsden Hospital points out, "Such early stage detection could make it possible for non-responding patients to avoid unnecessary toxicity related to therapy. Developing and using imaging biomarkers, however, is complex. The data acquisition methods are quite involved, there are regulatory issues that need to be considered when trialling new imaging agents, and image post-processing with advanced multi-vendor software is not trivial. Lack of rigorous quality control can lead to increased data variability, especially in multi center international trials."

Taking all this into consideration, the EORTC, EANM, ESR, and NCI researchers banded together to propose a practical risk-based framework and recommendations on imaging biomarker driven trials that allows identification of risks at trial initiation so that resources can be better allocated and key tasks prioritised.

Prof. Arturo Chiti, Humanitas Research Hospital in Milan and president of EANM, adds, "Several years back, the EANM began an accreditation program for PET sites, a very important and also successful effort to reduce the difference and increase the reproducibility of data obtained by positron emission tomography (PET) scans. This program helped reduce variability in the measurement of parameters such as SUV (Standard Uptake Value), following calibration of the scanner. There are still problems integrating and implementing imaging biomarkers into multicenter trials, so this study should help us address those risks."

The authors recommend that an initial risk assessment plan should be developed before the study starts and be performed during protocol development, site activation, accrual, and at the end of the trial.

This assessment could be realised by a multidisciplinary team that includes imaging experts, oncologists, as well as the study project managers.

They also advise that the risk assessment plan should also be reviewed and updated throughout the trial in order to ensure that actions have been or will be taken.

Source: European Organisation For Research And Treatment Of Cancer