scholarly journals Individualized Clinical Target Volume Delineation and Efficacy Analysis in Unilateral Nasopharyngeal Carcinoma Treated with Intensity-Modulated Radiotherapy (IMRT): 10-Year Summary and Results

2021 ◽  
Author(s):  
De-Huan Xie ◽  
Zheng Wu ◽  
Wang-Zhong Li ◽  
Wan-Qin Cheng ◽  
Ya-Lan Tao ◽  
...  
Keyword(s):  
Nasopharyngeal Carcinoma ◽  
Clinical Target Volume ◽  
Parapharyngeal Space ◽  
Intensity Modulated Radiotherapy ◽  
Target Volume ◽  
Recurrence Free Survival ◽  
Free Survival ◽  
Intensity Modulated

Abstract Purpose: To evaluate the long-term local control, failure patterns, and toxicities after individualized clinical target volume (CTV) delineation in unilateral nasopharyngeal carcinoma (NPC) treated with intensity-modulated radiotherapy (IMRT).Methods: Unilateral NPC was defined as nasopharyngeal mass confined to one side of nasopharynx and did not significantly exceed the midline of nasopharyngeal apex/posterior wall. From November 2003 to December 2017, 95 patients with long-term follow-up were retrospectively included. All patients received IMRT. The CTVs were determined based on the distance from the gross tumor, the contralateral parapharyngeal space and skull base orifices were spared from irradiation.Results: There were 3 local recurrence and 8 regional recurrences in 10 patients during 84- month follow-up. All local recurrences were PGTVnx-in-field, and no recurrences in traditional high-risk area including contralateral parapharyngeal space and skull base orifices. The 10-year local-recurrence free survival, regional-recurrence free survival and overall survival were 96.2%, 90.5% and 84.7%, respectively. The dosimetry parameters of the tumor-contralateral organs were all lower than the values of the tumor-ipsilateral side (P < 0.05). The late toxicities occurred mainly in the tumor-ipsilateral organs, including radiation-induced temporal lobe injury, impaired visuality, hearing loss and subcutaneous fibrosis.Conclusion: Individualized CTV delineation in unilateral NPC could yield excellent long-term local control with limited out-of-field recurrences, reduced dose to tumor- contralateral organs and mild late toxicities, which is worthy of further exploration.

scholarly journals Clinical Outcomes and Prognostic Factors of 695 Nasopharyngeal Carcinoma Patients Treated with Intensity-Modulated Radiotherapy

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Weidong Wang ◽  
Mei Feng ◽  
Zixuan Fan ◽  
Jie Li ◽  
Jinyi Lang
Keyword(s):  
Prognostic Factors ◽  
Nasopharyngeal Carcinoma ◽  
Clinical Outcomes ◽  
Distant Metastasis ◽  
Clinical Target Volume ◽  
Intensity Modulated Radiotherapy ◽  
Disease Free Survival ◽  
Target Volume ◽  
Free Survival ◽  
Intensity Modulated

Objective. The 5-year clinical outcomes and prognostic factors of nasopharyngeal carcinoma (NPC) patients treated with intensity modulated radiotherapy (IMRT) were evaluated.Methods. Six hundred ninety five NPC patients primarily treated with IMRT in Sichuan Cancer Hospital from January, 2003 to December, 2006 were analyzed retrospectively, including 540 males and 155 females. The prescription dose was delivered as follows: gross target volume (GTVnx) 67–76 Gy in 30–33 fractions, positive neck lymph nodes (GTVln-R/L) 60–70 Gy in 30–33 fractions, high-risk clinical target volume (CTV1) 60–66 Gy, low-risk clinical target volume (CTV2) 54–60 Gy, and clinical target volume of cervical lymph node regions (CTVln) 50–55 Gy.Results. The 5-year local control (LC), regional control, distant metastasis-free survival (DMFS), disease free survival, disease specific survival, and overall survival (OS) rates were 89.8%, 95.2%, 74.1%, 69.6%, 83.2%, and 77.1%. The 5-year DMFS of IMRT and IMRT combined with chemotherapy was 62.1% and 70.9%, the OS of them was 72.9% and 79.1%. The incidence of grade 3 acute and late toxicity was 38.3% and 4.2%, respectively.Conclusion. The 5-year LC and OS rate of NPC treated with IMRT was 89.8% and 77.1%. The clinical stage, N stage, volume of GTVnx, and chemotherapy were the main prognostic factor for the OS. Distant metastasis was the main pattern of failure.

scholarly journals Comprehensive Treatment for Major Salivary Gland Carcinoma Based on Intensity-Modulated Radiotherapy with or without Radical Surgery

2021 ◽  
Author(s):  
Zichen Qiu ◽  
Zheng Wu ◽  
Feifei Lin ◽  
Lei Wang ◽  
Dehuan Xie ◽  
...  
Keyword(s):  
Radical Surgery ◽  
Intensity Modulated Radiotherapy ◽  
Target Volume ◽  
Major Salivary Gland ◽  
Salivary Gland Carcinoma ◽  
Free Survival ◽  
Intensity Modulated ◽  
Stage Disease ◽  
Gland Carcinoma

Abstract Background The present study aimed to determine a treatment strategy and Intensity-Modulated Radiotherapy (IMRT) target volume for major salivary gland carcinoma (SGC). Methods Patients with SGC treated at our cancer center between August 2009 and August 2020 were retrospectively reviewed. Results The following primary tumor sites were identified: parotid gland in 61 (69.3%) patients, submandibular gland in 21 (23.9%) patients, and sublingual gland in six (6.8%) patients. Lymphoepithelial carcinoma (LEC) was the most common tumor subtype that accounted for 23.9% of cases. A total of 80 (90.9%) patients received radical surgery combined with postoperative radiotherapy. Eight patients (9.1%) received definitive radiotherapy: six patients with advanced-stage disease received induction chemotherapy (IC) combined with concurrent chemoradiotherapy (CCRT), and two patients with early-stage disease received CCRT. Complete response was observed in these eight patients after treatment completion. The median follow-up time of all patients was 42 months (range: 4–129 months). No patient developed local recurrence. The 5-year overall survival, regional failure-free survival, distant metastasis-free survival, and progression-free survival probabilities were 84.1%, 95.6%, 75.3%, and 75.7%, respectively. Distant metastasis was observed in 18 (20.5%) patients, followed by regional 2 (2.3%) recurrence. Permanent facial nerve injury was confirmed in 31 patients by follow-up. None of the patients experienced facial nerve paralysis in the definitive radiotherapy group. Conclusions LECs may be sensitive to chemoradiotherapy, which may achieve a radical effect and avoid unnecessary surgical injury. IC combined with CCRT is expected to become a new treatment strategy for advanced LECs. The IMRT target volume delineation according to the surgical principles may be a more promising method with good clinical efficacy that is worthy of further study.

scholarly journals Clinical Outcome and Prognostic Factors of Intensity-Modulated Radiotherapy for T4 Stage Nasopharyngeal Carcinoma

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Yangkun Luo ◽  
Yang Gao ◽  
Guangquan Yang ◽  
Jinyi Lang
Keyword(s):  
Prognostic Factors ◽  
Prognostic Factor ◽  
Nasopharyngeal Carcinoma ◽  
Lymph Nodes ◽  
Distant Metastasis ◽  
Intensity Modulated Radiotherapy ◽  
Recurrence Free Survival ◽  
Free Survival ◽  
Intensity Modulated ◽  
T4 Stage

Objective. To analyze the clinical outcomes and prognostic factors of intensity-modulated radiotherapy (IMRT) for T4 stage nasopharyngeal carcinoma (NPC).Methods. Between March 2005 and March 2010, 110 patients with T4 stage NPC without distant metastases were treated. All patients received IMRT. Induction and/or concurrent chemotherapy were given. 47 (42.7%) patients received IMRT replanning.Results. The 5-year local recurrence-free survival (LRFS), regional recurrence-free survival (RRFS), distant metastasis-free survival (DMFS), progression-free survival (PFS), and overall survival (OS) rates were 90.1%, 97.0%, 67.5%, 63.9%, and 64.5%, respectively. Eleven patients experienced local-regional failure and total distant metastasis occurred in 34 patients. 45 patients died and 26 patients died of distant metastasis alone. The 5-year LRFS rates were 97.7% and 83.8% for the patients that received and did not receive IMRT replanning, respectively (P=0.023). Metastasis to the retropharyngeal lymph nodes (RLN) was associated with inferior 5-year OS rate (61.0% versus 91.7%,P=0.034). The gross tumor volume of the right/left lymph nodes (GTVln) was an independent prognostic factor for DMFS (P=0.006) and PFS (P=0.018). GTVln was with marginal significance as the prognostic factor for OS (P=0.050).Conclusion. IMRT provides excellent local-regional control for T4 stage NPC. Benefit of IMRT replanning may be associated with improvement in local control. Incorporating GTVln into the N staging system may provide better prognostic information.

scholarly journals Loosening Neuro-Optic Structures Dosimetric Constraints Provides High 5-Year Local Recurrence-Free Survival With Acceptable Toxicity in T4 Nasopharyngeal Carcinoma Patients Treated With Intensity-Modulated Radiotherapy

2021 ◽  
Vol 11 ◽  
Author(s):  
Tingting Zhang ◽  
Meng Xu ◽  
Jinglin Mi ◽  
Hui Yang ◽  
Zhengchun Liu ◽  
...  
Keyword(s):  
Nasopharyngeal Carcinoma ◽  
Local Recurrence ◽  
Maximum Dose ◽  
Survival Rates ◽  
Intensity Modulated Radiotherapy ◽  
Recurrence Free Survival ◽  
Free Survival ◽  
Intensity Modulated ◽  
Significant Difference ◽  
Local Recurrence Free Survival

ObjectiveWhether the original dosimetric constraints of neuro-optic structures (NOS) are appropriate for patients with nasopharyngeal carcinoma (NPC) undergoing intensity-modulated radiotherapy (IMRT) remains controversial. The present study compared the survival rates and radiation-induced optic neuropathy (RION) occurrence between T4 NPC patients whose NOS were irradiated with a near maximum dose received by 2% of the volume (D2%) &gt;55 Gy and ≤55 Gy. Moreover, the NOS dosimetric parameters and their correlation with RION occurrence were also evaluated.MethodsIn this retrospective study, 256 T4 NPC patients treated with IMRT between May 2009 and December 2013 were included. Patient characteristics, survival rates, dosimetric parameters, and RION incidence were compared between the D2% ≤55 Gy and D2% &gt;55 Gy groups.ResultsThe median follow-up durations were 87 and 83 months for patients in the D2% &gt;55 Gy and D2% ≤55 Gy groups, respectively. The 5-year local recurrence-free survival rates were 92.0 and 84.0% in the D2% &gt;55 Gy and D2% ≤55 Gy groups (P = 0.043), respectively. There was no significant difference in the 5-year overall survival (OS) between both groups (D2% &gt;55 Gy, 81.6%; D2% ≤55 Gy, 79.4%; P = 0.586). No patients developed severe RION (Grades 3–5), and there was no significant difference (P = 0.958) in the incidence of RION between the two groups. The maximum dose of NOS significantly affected the RION incidence, with a cutoff point of 70.77 Gy.ConclusionAppropriately loosening NOS dosimetric constraints in order to ensure a more sufficient dose to the target volume can provide a better 5-year local recurrence-free survival and acceptable neuro-optic toxicity in T4 NPC patients undergoing IMRT.

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