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        Cervical cancer patient reported gastrointestinal outcomes: intensity/ volumetric modulated vs. 3D conformal radiation therapy

        Ryan Urban,Justin Wong,Peter Lim,Susan Zhang,Ingrid Spadinger,Robert Olson,Francois Bachand,Clement Ho,Anna V. Tinker,Lovedeep Gondara,Sarah Nicole Hamilton 대한부인종양학회 2022 Journal of Gynecologic Oncology Vol.33 No.5

        Objective: To evaluate gastrointestinal (GI) patient reported outcomes (PROs) in cervical cancer patients treated with definitive radiotherapy (RT), comparing 3D conformal RT (3DCRT) vs. intensity modulated/volumetric modulated arc therapy (IMRT/VMAT). Methods: An analysis of patients treated with definitive RT between 2015–2018 was performed. GI PROs were prospectively collected at baseline, during RT (acute), ≤12 weeks after RT (subacute), and >12 weeks after RT (late). GI PROs evaluated three symptom domains: bowel problems (BPs), bowel bother (BB), and abdominal problems (APs). Multiple linear regression analysis was performed to investigate associations between mean changes of symptom scores with clinical and dosimetric variables. Results: The cohort included 167 patients. A total of 100 (60%) patients were treated with IMRT/VMAT and 67 (40%) with 3DCRT. In the subacute phase, the mean change of symptom scores from baseline in 3DCRT vs. IMRT/VMAT were +0.9 vs. −1.15 (p=0.004) for BP, +2.18 vs. −0.10 (p=0.019) for BB, and +1.41 vs. −0.38 (p=0.021) for AP. Likewise, in the late phase, mean changes were +0.72 vs. −0.82 (p=0.014) for BP, +1.98 vs. −0.03 (p=0.008) for BB, and +1.29 vs. −0.31 (p<0.001) for AP. On multiple linear regression, use of 3DCRT vs. IMRT/VMAT was associated with greater mean changes in subacute BP (p=0.023) and late phase AP (p=0.019). A higher small bowel V50Gy was associated increased symptom scores in late AP (p=0.012). Conclusion: 3DCRT was associated with significantly greater worsening of GI PRO symptom scores in the subacute and late phase. These data support the ongoing use of IMRT/VMAT in routine practice

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