Impact of genetic variant of HIPK2 on the risk of severe radiation pneumonitis in lung cancer patients treated with radiation therapy

Yang Tang, Li Yang, Wan Qin, Min' Xiao Yi, Bo Liu, Xiang'Lin Yuan, Yang Tang, Li Yang, Wan Qin, Min' Xiao Yi, Bo Liu, Xiang'Lin Yuan

Abstract

Background: Homeodomain-interacting protein kinase 2 (HIPK2) has increasingly drawn attention as recent researches demonstrated its unique role in the regulation of multiple fundamental processes such as apoptosis, proliferation and DNA damage repair. Most importantly, HIPK2 was shown to play regulatory role in inflammation and influence the phenotype and activity of fibroblasts. In this study, we aimed to evaluate the impact of HIPK2 gene variant on risk of radiation pneumonitis for patients with pulmonary malignancies.

Methods: 169 lung cancer patients with radiotherapy were included in our prospective study and genotyped by Sanger Sequence method. Multivariable Cox hazard analysis and multiple testing were applied to estimate the hazard ratio (HR) and 95% confidence intervals (CIs) of all factors possibly related to the risk of radiation pneumonitis (RP).

Results: Patients with Mean Lung Dose (MLD) ≥ 15Gy, Lung V20 ≥ 24% had higher risk of RP ≥ grade 2 compared with those counterparts (HR = 1.888, 95% CI: 1.186-3.004, P = 0.007; HR = 2.126, 95% CI: 1.338-3.378, P = 0.001, respectively). Importantly, CC genotype of HIPK2: rs2030712 were strongly related to an increased occurrence of RP ≥ grade 2 (HR = 2.146, 95% CI: 1.215-3.791, P = 0.009).

Conclusion: HIPK2: rs2030712 was found to be significantly related to RP of grade ≥ 2 in our cohort, and may thus be one of the important predictors of severe RP before radiotherapy, if further validated in larger population.

Trial registration: Our study was prospective and observational. The research was registered in ClinicalTrials.gov database as NCT02490319.

Keywords: HIPK2; Lung cancer; Radiation pneumonitis; SNP.

Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Kaplan-Meier estimates RP-free survival (RP ≥ grade 2) for each genotype of HIPK2:rs2030712
Fig. 2
Fig. 2
Kaplan-Meier estimates effect of genotype in HIPK2:rs2030712 and dosimetric parameters on RP-free survival (RP ≥ grade 3) (a) HIPK2:rs2030712 and MLD; (b) HIPK2:rs2030712 and V20

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