Development and validation of a novel MR imaging predictor of response to induction chemotherapy in locoregionally advanced nasopharyngeal cancer: a randomized controlled trial substudy (NCT01245959)

Di Dong, Fan Zhang, Lian-Zhen Zhong, Meng-Jie Fang, Cheng-Long Huang, Ji-Jin Yao, Ying Sun, Jie Tian, Jun Ma, Ling-Long Tang, Di Dong, Fan Zhang, Lian-Zhen Zhong, Meng-Jie Fang, Cheng-Long Huang, Ji-Jin Yao, Ying Sun, Jie Tian, Jun Ma, Ling-Long Tang

Abstract

Background: In locoregionally advanced nasopharyngeal carcinoma (LANPC) patients, variance of tumor response to induction chemotherapy (ICT) was observed. We developed and validated a novel imaging biomarker to predict which patients will benefit most from additional ICT compared with chemoradiotherapy (CCRT) alone.

Methods: All patients, including retrospective training (n = 254) and prospective randomized controlled validation cohorts (a substudy of NCT01245959, n = 248), received ICT+CCRT or CCRT alone. Primary endpoint was failure-free survival (FFS). From the multi-parameter magnetic resonance images of the primary tumor at baseline, 819 quantitative 2D imaging features were extracted. Selected key features (according to their interaction effect between the two treatments) were combined into an Induction Chemotherapy Outcome Score (ICTOS) with a multivariable Cox proportional hazards model using modified covariate method. Kaplan-Meier curves and significance test for treatment interaction were used to evaluate ICTOS, in both cohorts.

Results: Three imaging features were selected and combined into ICTOS to predict treatment outcome for additional ICT. In the matched training cohort, patients with a high ICTOS had higher 3-year and 5-year FFS in ICT+CCRT than CCRT subgroup (69.3% vs. 45.6% for 3-year FFS, and 64.0% vs. 36.5% for 5-year FFS; HR = 0.43, 95% CI = 0.25-0.74, p = 0.002), whereas patients with a low ICTOS had no significant difference in FFS between the subgroups (p = 0.063), with a significant treatment interaction (pinteraction < 0.001). This trend was also found in the validation cohort with high (n = 73, ICT+CCRT 89.7% and 89.7% vs. CCRT 61.8% and 52.8% at 3-year and 5-year; HR = 0.17, 95% CI = 0.06-0.51, p < 0.001) and low ICTOS (n = 175, p = 0.31), with a significant treatment interaction (pinteraction = 0.019). Compared with 12.5% and 16.6% absolute benefit in the validation cohort (3-year FFS from 69.9 to 82.4% and 5-year FFS from 63.4 to 80.0% from additional ICT), high ICTOS group in this cohort had 27.9% and 36.9% absolute benefit. Furthermore, no significant survival improvement was found from additional ICT in both groups after stratifying low ICTOS patients into low-risk and high-risks groups, by clinical risk factors.

Conclusion: An imaging biomarker, ICTOS, as proposed, identified patients who were more likely to gain additional survival benefit from ICT+CCRT (high ICTOS), which could influence clinical decisions, such as the indication for ICT treatment.

Trial registration: ClinicalTrials.gov , NCT01245959 . Registered 23 November 2010.

Keywords: Individualized imaging biomarker; Induction chemotherapy; Locoregionally advanced nasopharyngeal cancer; Survival benefit; Treatment decision.

Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Radiomics workflow in this study. a Collection of multi-sequence MR images. b Tumor segmentation by radiologists. c Preprocessing of the MR images. d Feature extraction from tumor region. e Model construction and validation
Fig. 2
Fig. 2
Study design. The belief design of patient recruitment, matching procedures, model construction and validation, and further stratification analysis. ICT, induction chemotherapy; CCRT, concurrent chemoradiotherapy; MRI, magnetic resonance imaging; IPTW, inverse probability of treatment weighting; ICTOS, Induction Chemotherapy Outcomes Score
Fig. 3
Fig. 3
Failure-free survival in the training and validation cohorts stratified by low and high ICTOS. Kaplan-Meier curves compared the ICT+CCRT patients and CCRT patients in the whole group (a), high ICTOS group (b), and low ICTOS group (c) in the matched training cohort. Kaplan-Meier curves compared the ICT+CCRT patients and CCRT patients in the whole group (d), high ICTOS group (e), and low ICTOS group (f) in the prospective validation cohort. ICT, induction chemotherapy; CCRT, concurrent chemoradiotherapy; ICTOS, Induction Chemotherapy Outcomes Score; HR, hazard ratio; CI, confidence interval
Fig. 4
Fig. 4
Stratification analysis of patients with low ICTOS in the prospective validation cohort. Kaplan-Meier curves compared the low-risk and high-risk patients (a). Kaplan-Meier curves compared the ICT+CCRT patients and CCRT patients in the low-risk and high-risk groups (b). ICT, induction chemotherapy; CCRT, concurrent chemoradiotherapy; ICTOS, Induction Chemotherapy Outcomes Score; HR, hazard ratio; CI, confidence interval

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