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E.M. Wilson



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    MO23 - Radiotherapy II: Lung Toxicity, Target Definition and Quality Assurance (ID 107)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Radiation Oncology + Radiotherapy
    • Presentations: 2
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      MO23.04 - Is pre-trial quality assurance (QA) effective? A comparison of pre-trial QA versus ongoing QA for the CONVERT Trial. (ID 1809)

      10:50 - 10:55  |  Author(s): E.M. Wilson

      • Abstract
      • Presentation
      • Slides

      Background
      CONVERT is an international randomised phase III trial comparing 45Gy in 30 fractions twice-daily and 66Gy in 33 fractions once-daily (given concurrently with cisplatin/etoposide) for good performance status patients with limited stage small cell lung cancer. A QA programme was set-up to standardise radiotherapy (RT) delivery across all centres.

      Methods
      The pre-trial QA exercise (PQE) involved completion of a questionnaire and treatment planning exercise. Each participating clinician was asked to select a previously treated patient, who fitted the entry criteria for the trial, and provide disease and organs at risk (OAR) outlines and a treatment plan for both arms of the trial. QA guidelines, including an atlas for OAR outlining, were distributed to participating centres. Additionally, at least one RT plan per centre was randomly collected during the trial (ongoing QA exercise-OQE). A comparison was made between the PQE and OQE for each centre, including a review of eligibility criteria, OAR and gross tumour volume (GTV) outlining, expansion to clinical target volume (CTV) and planning target volume (PTV).

      Results
      Twenty nine clinicians from 28 centres who had completed both the pre-trial QA and the ongoing QA were included in the analysis. From the pre-trial questionnaire it was reported that 3 centres were using beam energies of 10MV or more which was not permitted as per protocol. Subsequently the PQE showed that these all used acceptable beam energies. Four clinicians submitted ineligible patients for the PQE and none for the OQE. Twenty five clinicians (86.2%) used the correct GTV to CTV and CTV to PTV expansions for the PQE and OQE. Table 1 shows a comparison of adherence to protocol regarding OAR outlining between the PQE and OQE. Table 1

      Oesophagus outline Spinal canal outline Heart outline Lung-PTV outline
      PQE-OAR outline as per protocol (n=29) 19 (65.5%) 14 (48.3%) 4 (13.8%) 20 (68.9%)
      OQE-OAR outline as per protocol (n=29) 21 (72.4%) 18 (62.1%) 8 (27.6%) 20 (68.9%)
      Organ at risk doses were found to be within the tolerances specified in the trial protocol for both PQE and OQE.

      Conclusion
      A PQE improves clinicians’ compliance to trial protocol, and has been found in the OQE to reduce deviations across the participating centres that may confound the results of the study. Despite the fact that consistency of OAR outlining remained an issue in both the PQE and the OQE an overall improvement was seen following the PQE.

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      MO23.05 - Changes in lung radiotherapy techniques during the CONVERT Trial. A survey of participating centres. (ID 1820)

      10:45 - 10:50  |  Author(s): E.M. Wilson

      • Abstract
      • Presentation
      • Slides

      Background
      CONVERT is an international randomised phase III trial, comparing 45Gy in 30 fractions twice-daily or 66Gy in 33 fractions once-daily (given concurrently with cisplatin/etoposide) for good performance status patients with limited stage small cell lung cancer. A survey was sent out to 69 clinicians who had randomised patients into the trial with the aim of establishing how radiotherapy techniques for lung cancer have changed over the 5 years since the trial opened.

      Methods
      As part of the pre-trial quality assurance process each centre was asked to complete a facility questionnaire giving details of treatment planning, delivery and verification techniques. Recruitment to the trial began in April 2008 and in January 2013, a further facility questionnaire was sent to centres. The survey was completed using an on-line survey tool.

      Results
      This analysis includes answers from the 34 clinicians who responded to the questionnaire. Changes in treatment planning techniques and verification since the beginning of the trial are summarised in table 1. Table 1 Figure 1 *Note that some centres reported using more than one beam arrangement, beam energy, planning algorithm or treatment verification technique. Out of the 34 clinicians who answered the questionnaire, 14 (41.1%) are currently using 4DCT, 3 (8.8%) are using breathold techniques and 16 (47.1%) are not using any technique to account for respiratory motion for simulation and treatment planning of lung patients. Data on management of respiratory motion were not available in 2008.

      Conclusion
      During the 5 years the CONVERT Trial has been open there have been significant advances in radiotherapy treatment technology. Major changes include the use of Type B treatment planning algorithms and PET CT for planning, IMRT for treatment and CBCT for treatment verification of patients with small cell lung cancer.

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    P3.13 - Poster Session 3 - SCLC (ID 202)

    • Event: WCLC 2013
    • Type: Poster Session
    • Track: Medical Oncology
    • Presentations: 1
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      P3.13-005 - CONVERT - the challenges of opening centres and recruiting patients to an international multi-centre chemo-radiotherapy trial in limited-stage small cell lung cancer (ID 1366)

      09:30 - 09:30  |  Author(s): E.M. Wilson

      • Abstract

      Background
      CONVERT is a multicentre, randomised, phase III trial open in Europe and Canada in limited-stage small cell lung cancer. Patients are randomised to twice (45 Gy in 30 fractions) or once-daily radiotherapy (66 Gy in 33 fractions) given concurrently with 4-6 cycles of chemotherapy. This study is funded by Cancer Research UK and involves centres from the UK NCRI, the ‘Groupe Francais de Pneumo-Cancerologie’, the Spanish Lung Cancer Group, the EORTC and NCIC CTG.

      Methods
      To identify and review the challenges in site set-up. To review time taken from site initiation to first patient randomised, number of centres opened that included 0-2 patients and number of centres that recruited the majority of all patients.

      Results
      In June 2013, 519/532 patients had been recruited in 9 countries; 299 from 32 UK centres, 100 from 17 French centres, 39 from 9 Canadian centres, 27 from 6 Spanish centres, 26 from 3 Belgian centres, 13 patients from 1 centre in Slovenia, 9 from 2 centres in The Netherlands and 6 patients from 1 centre in Poland. Figure 1 shows the number of centres open and patients recruited. 96 sites are currently open to recruitment (5 sites opened in 2008, 34 in 2009, 31 in 2010, 17 in 2011, 8 in 2012 & 3 in 2013, 2 sites subsequently closed early) of which 74 (77%) have randomised at least 1 patient. 24 sites (25%) recruited only 1 or 2 patients. 10 sites have recruited 49% of the total number of patients with a single site recruiting 18.5% of all patients randomised. Time taken from site initiation to 1[st] patient randomised ranged from 0–1029 days with a median of 144 days. Time taken to complete the QA exercise from initial information sent to site ranged from 14-1181 days with a median of 290.5 days. Figure 1

      Conclusion
      Recruitment to an academic trial in LS-SCLC is a challenge but accrual has improved considerably since 2008. This can be directly related to the increasing number of sites opened to recruitment. Duration of site set-up and completion of the QA exercise are factors explaining slower than anticipated accrual rates particularly between 2008 and 2010. We anticipate that the study will close to recruitment in July 2013. International participation has been a key factor to the success of the trial and the experience gained will be of value to the design of future radiotherapy studies to ensure target accrual.