ABSTRACT
BACKGROUND AND PURPOSE: Numerous fractionation regimes are used for inoperable NSCLC patients not suitable for stereotactic ablative radiotherapy. Continuous hyperfractionated accelerated radiotherapy (CHART, 54â¯Gy, 36 fractions over 12â¯days) and hypofractionated accelerated radiotherapy (55â¯Gy, 20 fractions over 4â¯weeks) are recommended UK schedules. In this single-centre retrospective analysis, we compare both fractionation schemes for patients treated at our institution from 2010 to 15. MATERIALS AND METHODS: Clinical demographic, tumour and survival data were collected alongside radiotherapy dosimetric data from the Varian Eclipse Scripting application programming interface. Differences were assessed using independent samples t-tests. Multivariate survival analysis was performed using Cox regression. RESULTS: We identified 563 eligible patients; 43% received CHART and 57% hypofractionated radiotherapy. Median age was 71â¯years, 56% were male, 95% PET staged with 53% WHO performance status 0-1. 30%, 14%, 50% and 6% were stage I, II, III and IV, respectively. 38% of patients underwent induction chemotherapy. 99% completed their prescribed radiotherapy treatment. Overall response rate was 50% with a 6.5% 90-day mortality rate. Median disease-free survival was 19â¯months, 50% recurred locally. Median overall survival was 22.5â¯months with 48% alive at 2â¯years. Multivariate analysis identified histology, stage, performance status, chemotherapy and radiotherapy response as independent predictors of survival; no significant differences between radiotherapy regimes were observed. CONCLUSION: In our centre, CHART and hypofractionated accelerated radiotherapy produce similar outcomes. Dose escalation studies are in progress to develop these schedules to match outcomes reported in concurrent chemo-radiation studies.
Subject(s)
Carcinoma, Non-Small-Cell Lung , Lung Neoplasms , Aged , Antineoplastic Combined Chemotherapy Protocols , Carcinoma, Non-Small-Cell Lung/pathology , Female , Humans , Lung Neoplasms/pathology , Male , Neoplasm Recurrence, Local , Neoplasm Staging , Retrospective StudiesABSTRACT
BACKGROUND AND PURPOSE: To investigate the incorporation of data from single-photon emission computed tomography (SPECT) or hyperpolarized helium-3 magnetic resonance imaging ((3)He-MRI) into intensity-modulated radiotherapy (IMRT) planning for non-small cell lung cancer (NSCLC). MATERIAL AND METHODS: Seven scenarios were simulated that represent cases of NSCLC with significant functional lung defects. Two independent IMRT plans were produced for each scenario; one to minimise total lung volume receiving >or=20Gy (V(20)), and the other to minimise only the functional lung volume receiving >or=20Gy (FV(20)). Dose-volume characteristics and a plan quality index related to planning target volume coverage by the 95% isodose (V(PTV95)/FV(20)) were compared between anatomical and functional plans using the Wilcoxon signed ranks test. RESULTS: Compared to anatomical IMRT plans, functional planning reduced FV(20) (median 2.7%, range 0.6-3.5%, p=0.02), and total lung V(20) (median 1.5%, 0.5-2.7%, p=0.02), with a small reduction in mean functional lung dose (median 0.4Gy, 0-0.7Gy, p=0.03). There were no significant differences in target volume coverage or organ-at-risk doses. Plan quality index was improved for functional plans (median increase 1.4, range 0-11.8, p=0.02). CONCLUSIONS: Statistically significant reductions in FV(20), V(20) and mean functional lung dose are possible when IMRT planning is supplemented by functional information derived from SPECT or (3)He-MRI.
Subject(s)
Carcinoma, Non-Small-Cell Lung/radiotherapy , Lung Neoplasms/radiotherapy , Magnetic Resonance Imaging/methods , Radiotherapy Planning, Computer-Assisted/methods , Radiotherapy, Intensity-Modulated/methods , Tomography, Emission-Computed, Single-Photon/methods , Carcinoma, Non-Small-Cell Lung/diagnostic imaging , Carcinoma, Non-Small-Cell Lung/pathology , Computer Simulation , Dose-Response Relationship, Radiation , Feasibility Studies , Humans , Imaging, Three-Dimensional/methods , Lung Neoplasms/diagnostic imaging , Lung Neoplasms/pathology , Radiation Injuries/prevention & control , Radiotherapy Dosage , Sensitivity and SpecificityABSTRACT
The overseas qualified nurse (OQN) has become an important part of the Australian nursing workforce. Efforts to enhance their adjustment to work and life in Australia have been recommended in the literature. This study examines the experiences and needs of a group of OQNs at a major metropolitan tertiary referral hospital in Australia. Using a descriptive survey, 56 nurses reported their experiences with three major themes emerging, career and lifestyle opportunities, differences in practice and homesickness. Nurses from culturally and linguistically diverse backgrounds reported not being employed in their chosen specialty and rating the utility of ward and hospital orientations more positively when compared to English speaking background nurses. From the study results an organisational and a personal approach has been undertaken to aid in the adjustment of OQNs into the nursing workforce.
