What is access to radiation therapy? A conceptual framework and review of influencing factors
Authors: Sundaresan Puma , Stockler Martin R. , Milross Christopher G. 
Published: June 2015

Objectives Optimal radiation therapy (RT) utilisation rates (RURs) have been defined for various cancer indications through extensive work in Australia and overseas. These benchmarks remain unrealised. The gap between optimal RUR and actual RUR has been attributed to inadequacies in ‘RT access’. We aimed to develop a conceptual framework for the consideration of ‘RT access’ by examining the literature for existing constructs and translating it to the context of RT services. We further aimed to use this framework to identify and examine factors influencing ‘RT access’. Methods Existing models of health care access were reviewed and used to develop a multi-dimensional conceptual framework for ‘RT access’. A review of the literature was then conducted to identify factors reported to affect RT access and utilisation. The electronic databases searched, the host platform and date range of the databases searched were Ovid MEDLINE, 1946 to October 2014 and PsycINFOvia OvidSP,1806 to October 2014. Results The framework developed demonstrates that ‘RT access’ encompasses opportunity for RT as well as the translation of this opportunity to RT utilisation. Opportunity for RT includes availability, affordability, adequacy (quality) and acceptability of RT services. Several factors at the consumer, referrer and RT service levels affect the translation of this opportunity for RT to actual RT utilisation. Conclusion ‘Access’ is a term that is widely used in the context of health service related research, planning and political discussions. It is a multi-faceted concept with many descriptions. We propose a conceptual framework for the consideration of ‘RT access’ so that factors affecting RT access and utilisation may be identified and examined. Understanding these factors, and quantifying them where possible, will allow objective evaluation of their impact on RT utilisation and guide implementation of strategies to modify their effects. What is known about the topic? It is well documented that the use of RT in Australia is well below evidence-based benchmarks. The shortfall in the use of RT has been attributed to problems with access to treatment services. Although considerable attention has been directed (rightly) towards addressing infrastructure needs, access to RT is more than just supply of services. There is currently no specific framework for RT access to comprehensively consider and examine other factors influencing the use of RT. The existing international literature addresses some of the influencing factors. However, there is a need for a detailed review of all actual and potential influencers of RT utilisation. What does this paper add? This paper presents a conceptual framework for the specific consideration of access to RT. A detailed review of various factors affecting access and utilisation of RT has been performed using the aforementioned conceptual framework. To our knowledge this is the first such review and hence we are confident that it adds to the existing international literature on this subject. What are the implications for practitioners? The topic of improving consumers’ access to RT is of relevance locally, in Australia, as well as internationally. We feel that the RT access framework proposed herein will be of interest and use to those involved in health services research, delivery and policy, especially those involved with the planning and delivering of cancer services. In addition to compiling evidence on the subject, the review of factors influencing RT utilisation highlights and proposes areas for future translational and implementation research in the areas of health services and treatment-related decision making.