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Extra-cranial Stereotactic Radiation Therapy (ESRT) in the treatment of inoperable stage 1 & 2 non-small-cell lung cancer patients with highly mobile tumours: a literature review

Published online by Cambridge University Press:  30 November 2010

Emily W. Tooke*
Affiliation:
Department of Allied Health Professions, School of Health and Social Care, Faculty of Health and Life Science, The University of the West of England, Glenside Campus, Blackberry Hill, Stapleton, Bristol, UK
Benjamin Roe
Affiliation:
Department of Allied Health Professions, School of Health and Social Care, Faculty of Health and Life Science, The University of the West of England, Glenside Campus, Blackberry Hill, Stapleton, Bristol, UK
*
Correspondence to: Emily Tooke, Beacon Centre Radiotherapy, Musgrove Park Hospital, Taunton, Somerset TA1 5DA, UK. Email: emily.tooke@tst.nhs.uk

Abstract

Objective: Extra-cranial Stereotactic Radiation Therapy (ESRT) techniques and equipment utilised in the treatment of Stage 1 or 2 inoperable non-small-cell lung cancer (NSCLC); accounting for Respiratory Induced Tumour Motion (RITM).

Methods: A narrative review of current world literature.

Results: Four main strategies are employed to address RITM: (1) tumour movement minimisation/immobilisation; (2) integration of respiratory movements into planning; (3) respiratory-gating techniques; and (iv) tumour-tracking techniques.

Discussion: Analysis of data gathered suggests that due to inherent difficulties with respiratory function, combined with co-morbidities and the level of dose escalation facilitated by ESRT: techniques that do not require patient ability to comply are more likely to be effective with a wider range of patients. Similarly, treatment planning must incorporate accurate four-dimensional (4D) data to ensure target coverage, although setup and verification should be controlled to smaller margins for error.

Conclusion: The disparate nature of reporting methods restricts statistical comparison. However, this paper suggests that the ESRT technique using abdominal compression (AC), free-breathing respiratory-gating (FBRG), 4D computed tomography (4DCT) planning, combined with daily on board kV cone beam computed tomography (CBCT) imaging for setup and target verification, is a possible candidate for further treatment regime assessments in large multi-centre trials.

Type
Literature Review
Copyright
Copyright © Cambridge University Press 2010

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