Post-treatment lymphocytopaenia, integral body dose and overall survival in lung cancer patients treated with radical radiotherapy

Research output: Contribution to journalArticle

  • External authors:
  • Nuradh Joseph
  • Jason Kennedy
  • Kate Haslett
  • Jasmin Mahil
  • Abhilash Gavarraju

Abstract

Introduction: Post-treatment lymphocytopaenia is a recognized complication of thoracic radiotherapy likely due to irradiation of a large volume of circulatory blood. We hypothesize that post-treatment absolute lymphocyte count (ALC) is associated with integral body dose and overall survival (OS) in lung cancer patients treated with radical radiotherapy. Materials and methods: Data on clinicopathological variables, dosimetric parameters, and pre and post-treatment blood counts were collected retrospectively in 217 lung cancer patients (131 with non-small cell lung cancer and 86 with small cell lung cancer) treated with radical radiotherapy. Induction chemotherapy followed by radiotherapy and concurrent chemoradiotherapy were delivered in 89 (42%) and 99 (47%) patients respectively. Multiple stepwise regression analysis was performed separately for ALC and absolute neutrophil count (ANC) to derive a model for prediction of post-treatment count and multivariate analysis was performed for OS using a Cox regression model. Results: There was a significant decline in post-treatment counts for both ANC and ALC (p < 0.001). Multiple stepwise linear regression analysis confirmed pre-treatment ALC, body integral dose and use of concurrent chemotherapy as significant predictors of post-treatment ALC (R 2 = 0.33, F(4,212) = 26.6 p < 0.001). Pre-treatment ANC, integral heart dose and number of fractions were significant predictors of post-treatment ANC (R 2 = 0.18, F(3,213) = 16.38 p < 0.001). Low post-treatment ALC, high pre-treatment ANC, high planning target volume integral dose and lower number of fractions were predictive of inferior OS. Conclusions: There is a negative correlation between integral body dose and post-treatment ALC which is an adverse prognostic factor in lung cancer patients treated with radical radiotherapy.

Bibliographical metadata

Original languageEnglish
Pages (from-to)115-119
Number of pages5
JournalRadiotherapy and Oncology
Volume135
Early online date20 Mar 2019
DOIs
Publication statusPublished - 1 Jun 2019

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