Timing of Adjuvant Chemotherapy After Surgical Resection for Non-small Cell Lung Cancer : A Target Trial Emulation Using Nationwide Swedish Registry Data
(2025) In Annals of Surgical Oncology 32(7). p.4650-4659- Abstract
Background: We investigated the impact of time to adjuvant chemotherapy (AC) on survival after surgical resection (<8 weeks or 8–16 weeks) for patients with non-small cell lung cancer (NSCLC) by applying a target-trial emulation. Material and Methods: We used Swedish population-based healthcare registries to emulate a hypothetical target trial, with treatment arms of ‘initiate AC <8 weeks postoperatively’ and ‘initiate AC 8–16 weeks postoperatively’. The clone-censor-weight approach was used in which all patients were cloned and all clones were assigned to each treatment arm. Clones were then censored when the assigned treatment was no longer compatible with the actual treatment. Results: We included 510 patients in the... (More)
Background: We investigated the impact of time to adjuvant chemotherapy (AC) on survival after surgical resection (<8 weeks or 8–16 weeks) for patients with non-small cell lung cancer (NSCLC) by applying a target-trial emulation. Material and Methods: We used Swedish population-based healthcare registries to emulate a hypothetical target trial, with treatment arms of ‘initiate AC <8 weeks postoperatively’ and ‘initiate AC 8–16 weeks postoperatively’. The clone-censor-weight approach was used in which all patients were cloned and all clones were assigned to each treatment arm. Clones were then censored when the assigned treatment was no longer compatible with the actual treatment. Results: We included 510 patients in the hypothetical target trial, of whom 51% received AC and 150 (57%) started AC within 8 weeks. More than half of the patients were female (52.5%) and the mean age was 69 years. The 5-year disease-free survival (DFS) in the emulated trial for the group who initiated AC <8 weeks postoperatively was 50.3% and the 5-year overall survival (OS) was 58.1%. For the group who initiated AC 8–16 weeks postoperatively, the emulated trial showed a 5-year DFS and OS of 49.1% and 57.1%, respectively. Conclusion: By using target trial emulation, our study supports earlier data on timing for AC after surgical resection for NSCLC. However, further research is needed and our data indicate that a randomized controlled trial could be conducted without major harm to the experimental group (>8 weeks).
(Less)
- author
- Lampa, Erik ; Boros, Miklos ; Berglund, Anders ; Wagenius, Gunnar and Oskarsdottir, Gudrun N. LU
- organization
- publishing date
- 2025-07
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Immortal-time bias, Lung cancer, Real-world data, Target trial emulation
- in
- Annals of Surgical Oncology
- volume
- 32
- issue
- 7
- pages
- 10 pages
- publisher
- Springer
- external identifiers
-
- pmid:40106109
- scopus:105000826996
- ISSN
- 1068-9265
- DOI
- 10.1245/s10434-025-17193-0
- language
- English
- LU publication?
- yes
- id
- c165ff75-d956-4db8-b154-9ac40f00b52b
- date added to LUP
- 2025-09-11 11:02:30
- date last changed
- 2025-09-11 11:51:20
@article{c165ff75-d956-4db8-b154-9ac40f00b52b,
abstract = {{<p>Background: We investigated the impact of time to adjuvant chemotherapy (AC) on survival after surgical resection (<8 weeks or 8–16 weeks) for patients with non-small cell lung cancer (NSCLC) by applying a target-trial emulation. Material and Methods: We used Swedish population-based healthcare registries to emulate a hypothetical target trial, with treatment arms of ‘initiate AC <8 weeks postoperatively’ and ‘initiate AC 8–16 weeks postoperatively’. The clone-censor-weight approach was used in which all patients were cloned and all clones were assigned to each treatment arm. Clones were then censored when the assigned treatment was no longer compatible with the actual treatment. Results: We included 510 patients in the hypothetical target trial, of whom 51% received AC and 150 (57%) started AC within 8 weeks. More than half of the patients were female (52.5%) and the mean age was 69 years. The 5-year disease-free survival (DFS) in the emulated trial for the group who initiated AC <8 weeks postoperatively was 50.3% and the 5-year overall survival (OS) was 58.1%. For the group who initiated AC 8–16 weeks postoperatively, the emulated trial showed a 5-year DFS and OS of 49.1% and 57.1%, respectively. Conclusion: By using target trial emulation, our study supports earlier data on timing for AC after surgical resection for NSCLC. However, further research is needed and our data indicate that a randomized controlled trial could be conducted without major harm to the experimental group (>8 weeks).</p>}},
author = {{Lampa, Erik and Boros, Miklos and Berglund, Anders and Wagenius, Gunnar and Oskarsdottir, Gudrun N.}},
issn = {{1068-9265}},
keywords = {{Immortal-time bias; Lung cancer; Real-world data; Target trial emulation}},
language = {{eng}},
number = {{7}},
pages = {{4650--4659}},
publisher = {{Springer}},
series = {{Annals of Surgical Oncology}},
title = {{Timing of Adjuvant Chemotherapy After Surgical Resection for Non-small Cell Lung Cancer : A Target Trial Emulation Using Nationwide Swedish Registry Data}},
url = {{http://dx.doi.org/10.1245/s10434-025-17193-0}},
doi = {{10.1245/s10434-025-17193-0}},
volume = {{32}},
year = {{2025}},
}