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Michael Snee
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OA13 - Therapeutics and Radiation for Small Cell Lung Cancer (ID 927)
- Event: WCLC 2018
- Type: Oral Abstract Session
- Track: Small Cell Lung Cancer/NET
- Presentations: 1
- Moderators:
- Coordinates: 9/26/2018, 10:30 - 12:00, Room 203 BD
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OA13.01 - The Impact of [<sup>18</sup>F]fludeoxyglucose PET/CT in Small-Cell Lung Cancer: Analysis of the Phase 3 CONVERT Trial (ID 13319)
10:30 - 10:40 | Author(s): Michael Snee
- Abstract
- Presentation
Background
The role of 18fludeoxyglucose (18F-FDG) PET/CT in the management of limited stage small-cell lung cancer (LS-SCLC) is uncertain. Previous studies have shown that 18F-FDG PET/CT upstages up to 30% of LS-SCLC patients. Data from the CONVERT trial was analysed to investigate the impact of 18F-FDG PET/CT in the management of LS-SCLC. The prognostic significance of pre-treatment 18F-FDG PET parameters was also investigated in an exploratory analysis.
a9ded1e5ce5d75814730bb4caaf49419 Method
CONVERT is an international multi-centre phase III trial that randomly assigned fit patients to receive either twice-daily (45Gy in 30 fractions) or once-daily (66Gy in 33 fractions) radiotherapy starting on day 22 of chemotherapy cycle 1 (NCT00433563). Chemotherapy consisted of 4-6 cycles of cisplatin and etoposide. Prophylactic cranial irradiation was offered, if indicated. Contrast-enhanced thorax and abdomen CT and brain imaging (with/without bone scintigraphy according to clinical indication) were mandated for all CONVERT participants (conventional imaging). Staging with 18F-FDG PET/CT was allowed but not mandated. The primary endpoint was overall survival. Pre-treatment 18F-FDG PET metabolic parameters were investigated in a subset of patients (n=96) including standardised uptake values (max, mean and peak), volumetric and heterogeneity parameters.
4c3880bb027f159e801041b1021e88e8 Result
Of 547 patients recruited to CONVERT, 540 patients with data on staging investigations and outcome were included in this analysis. The use of staging 18F-FDG PET/CT was variable in the 8 countries recruiting to CONVERT (range, 41-100%). Compared to patients who underwent conventional imaging (n=231), patients who were also staged with 18F-FDG PET/CT (n=309) had smaller gross tumour volume (p=0·003), were less likely to have elevated pre-treatment serum lactate dehydrogenase (p=0·035), and received more chemotherapy cycles (p=0·026). There were no other significant differences in baseline and treatment characteristics between the two groups. There were no significant differences in overall (hazard ratio 0·87 [95% CI 0·70-1·08]; p=0·192) and progression-free survival (hazard ratio 0·87 [95% CI 0·71-1·07]; p=0·198) between patients staged with 18F-FDG PET/CT in addition to conventional imaging or with conventional imaging alone. These results were observed irrespective of treatment group (once-daily and twice-daily radiotherapy). Pre-treatment 18F-FDG PET parameters were also not prognostic.
8eea62084ca7e541d918e823422bd82e Conclusion
In CONVERT, survival outcomes were not different in LS-SCLC patients staged with or without 18F-FDG PET/CT. This was despite those patients staged with 18F-PET/CT having more favourable baseline and treatment characteristics. Our findings suggest that conventional imaging is sufficient to select LS-SCLC patients for concurrent chemoradiotherapy.
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P2.01 - Advanced NSCLC (Not CME Accredited Session) (ID 950)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Track:
- Presentations: 1
- Moderators:
- Coordinates: 9/25/2018, 16:45 - 18:00, Exhibit Hall
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P2.01-91 - Treatment Patterns in Patients with Stage IIIB-IV NSCLC in Clinical Practice: Retrospective Analysis of a UK Trust Database (ID 13261)
16:45 - 18:00 | Presenting Author(s): Michael Snee
- Abstract
Background
I-O Optimise is a new pan-European data platform developed to enable real-world insights into the management of thoracic malignancies. As part of this initiative, the current analysis reports the characteristics and treatment patterns for adult patients diagnosed with stage IIIB or IV NSCLC at Leeds Teaching Hospitals Trust (LTHT), hosting one of the largest integrated cancer centres in the UK.
a9ded1e5ce5d75814730bb4caaf49419 Method
Retrospective cohort study using longitudinal data already collected from electronic medical records at LTHT, including all adult patients diagnosed with stage IIIB-IV NSCLC between January 2007 and August 2017. Minimum follow-up was 6 months. Distinct lines of therapy (LoT) were identified using a clinically-verified algorithm based on the name and date of systemic anti-cancer therapy (SACT) administered and the gap between two treatments.
4c3880bb027f159e801041b1021e88e8 Result
Overall, 2119 patients were included. Mean age at diagnosis was 71.4 ± 11.2 years. Nearly one-third (32.7%) were clinically diagnosed without pathological confirmation (TABLE) and very few of these patients have SACT administration recorded. Following diagnosis, 648 patients (30.6%) received ≥1 LoT, 223 (10.5%) ≥2 LoT and 60 (2.8%) ≥3 LoT. Proportions of patients treated decreased with age (73.5% [25/34] aged 18-44 years; 52.7% [267/507] aged 45-64 years; 29.8% [310/1040] aged 65-79 years; 8.6% [46/538] aged 80+ years) and performance score (58.5% [387/662] PS0-1; 38.2% [158/414] PS2; 6.1% [52/848] PS3-4). Between the periods 2007-2011 and 2012-2017, increased proportions were treated (28.2% [263/933] and 32.5% [385/1186] respectively). Patient characteristics of the treated cohort and regimens administered for 1st and 2nd LoT are shown (TABLE).
8eea62084ca7e541d918e823422bd82e Conclusion
Around 70% of this real-world cohort did not receive any SACT, and the administration of treatment was strongly associated with age and performance status. The changing availability of treatment options over time (including the emergence of immunotherapy) and survival outcomes by LoT will be presented in more detail for the cohort described.
6f8b794f3246b0c1e1780bb4d4d5dc53
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P2.16 - Treatment of Early Stage/Localized Disease (Not CME Accredited Session) (ID 965)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Track:
- Presentations: 2
- Moderators:
- Coordinates: 9/25/2018, 16:45 - 18:00, Exhibit Hall
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P2.16-16 - SABRTOOTH: A Fasibility Study of SABR Versus Surgery in Patients with Peripheral Stage I NSCLC Considered to be at Higher Risk for Surgery. (ID 13679)
16:45 - 18:00 | Author(s): Michael Snee
- Abstract
Background
Stage I NSCLC is curable by surgery and Stereotactic Ablative Radiotherapy (SABR). Many patients have co-morbidities that place them at higher risk of surgical complications. For such patients it is unknown whether the potential benefits of surgery are outweighed by the risks since published randomised trials comparing surgery with SABR have been underpowered. The SABRTooth study was designed to determine the feasibility of randomising patients between the two treatments and thus performing a larger RCT.
a9ded1e5ce5d75814730bb4caaf49419 Method
Four thoracic oncology centres and a referral site participated. Patients with peripheral (>2cm from the main airways) stage T1-T2bN0M0 NSCLC were considered for study entry. Patients at higher risk were identified using several criteria including Thoracoscore and the Nottingham Risk Score and confirmed by multidisciplinary team consensus.
Eligible patients were approached by a respiratory physician and research nurse, consented and randomised (1:1) before consulting a surgeon or oncologist. Surgery was preferably by lobectomy with lymph node sampling/resection although sub-lobar resection was permitted. SABR was delivered as per the UK SABR guidelines.
An average recruitment rate of 3 patients/month from the 5 centres over a formal monitoring period was set to prove feasibility of a larger RCT. Meetings with the trial sites and patient representatives were held through-out to improve recruitment. Qualitative research was embedded into the study with interviews for patients who declined participation or randomised treatment.
4c3880bb027f159e801041b1021e88e8 Result
Between July 2015-January 2017 318 patients were assessed for eligibility of which 106 were initially considered eligible. 84 patients were approached for the study and 24 (29%) were randomised (10 surgery, 14 SABR); a mean recruitment rate of 1.7 per month. The median age was 75 (range 54-88). The main reason for declining the study was patient preference with 29% preferring surgery and 42% SABR. Overall 9/24 (38%) did not receive their randomised treatment. Of 7 patients randomised to surgery, 6 received SABR, 1 radical radiotherapy and of 2 patients randomised to SABR, 1 received radical radiotherapy, 1 was lost to follow-up.
8eea62084ca7e541d918e823422bd82e Conclusion
Despite recruiting at higher rate/centre than previous SABR versus surgery trials, the SABRTooth study failed to meet its recruitment target and the majority of patients randomised to surgery subsequently underwent SABR. Therefore, conducting a large RCT in the UK was shown not to be feasible. However, establishing which patients should have surgery or SABR for early stage NSCLC remains a critical question and alternative study designs are being developed to provide an answer for patients and clinicians.
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P2.16-17 - Hypo-Fractionated Accelerated Radiotherapy in Central Early Non-Small Cell Lung Cancer: Leeds Cancer Centre Experience. (ID 13503)
16:45 - 18:00 | Author(s): Michael Snee
- Abstract
Background
Centrally located early stage lung cancers in patients who are unfit for surgery and stereotactic ablative body radiotherapy (SABR) are routinely treated with radical radiotherapy. There are no standard dose regimens but evidence seems to favour acceleration. We present the outcomes of a moderately hypo-fractionated accelerated dose regimen of 50Gy in 15 fractions (BED (a/b=10) corrected for time = 58.85Gy) from a single centre in the UK.
a9ded1e5ce5d75814730bb4caaf49419 Method
Electronic case notes and radiotherapy records of lung cancer patients treated between January 2014 to December 2016 were retrospectively reviewed. Adult Comorbidity Evaluation-27 (ACE-27) score was used to evaluate comorbidities. Survival outcomes were estimated using Kaplan-Meier curves and compared using log-rank test.
4c3880bb027f159e801041b1021e88e8 Result
Fifty-three patients were treated with 50Gy in 15 fractions with a median age of 74.0 years (IQR: 69.5–79). 4 patients had a poor WHO PS of 3. Thirty-seven (69.8%) were females. A similar number had Grade 2 or 3 ACE-27 score while one had Grade 0. Forty-six patients were stage I, whilst four and three patients were stage II and III respectively. Thirty-seven (70%) patients had a radiological diagnosis.
The treatment was well tolerated, 90-day mortality rate after radiotherapy was 3.8% (n=2). Grade 2 pneumonitis was seen in 5 patients while no grade 3 or 4 pneumonitis was observed. At the time of cut-off for analysis, the median follow-up was 20.2 months. The median progression-free survival (PFS) and overall survival (OS) were 18.5 months (95% CI 12.2–24.8) and 28.2 months (95%CI 14.4–42.1) respectively. The estimated 1 and 2 year PFS were 62.3% and 41.3% respectively and OS were 77.4% and 56.6% respectively. Only PS significantly impacted survival on univariate analysis, while PS and ACE-27 both were shown to have significant effect on multivariate analysis.
Of the nineteen patients who relapsed, 4 (7.5%) had infield recurrence, 10 had out-of-field lung recurrence and the rest had distant metastases. One patient underwent salvage surgery. 6 patients received further radical therapy with 3 each being treated with conventional and SABR.
8eea62084ca7e541d918e823422bd82e Conclusion
This moderately hypo-fractionated accelerated radiotherapy regimen for central early stage lung cancer seems similar in efficacy but is associated with significantly less toxicity when compared to SABR.
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