scholarly journals Automated Non-Coplanar VMAT for Dose Escalation in Recurrent Head and Neck Cancer Patients

Cancers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1910
Author(s):  
Kaley Woods ◽  
Robert K. Chin ◽  
Kiri A. Cook ◽  
Ke Sheng ◽  
Amar U. Kishan ◽  
...  
Keyword(s):  
Head And Neck Cancer ◽  
Head And Neck ◽  
Neck Cancer ◽  
Dose Escalation ◽  
Volumetric Modulated Arc Therapy ◽  
Normal Tissue Complication Probability ◽  
Tumor Control ◽  
Tumor Control Probability ◽  
Increased Risk ◽  
Recurrent Head

This study evaluates the potential for tumor dose escalation in recurrent head and neck cancer (rHNC) patients with automated non-coplanar volumetric modulated arc therapy (VMAT) stereotactic body radiation therapy (SBRT) planning (HyperArc). Twenty rHNC patients are planned with conventional VMAT SBRT to 40 Gy while minimizing organ-at-risk (OAR) doses. They are then re-planned with the HyperArc technique to match these minimal OAR doses while escalating the target dose as high as possible. Then, we compare the dosimetry, tumor control probability (TCP), and normal tissue complication probability (NTCP) for the two plan types. Our results show that the HyperArc technique significantly increases the mean planning target volume (PTV) and gross tumor volume (GTV) doses by 10.8 ± 4.4 Gy (25%) and 11.5 ± 5.1 Gy (26%) on average, respectively. There are no clinically significant differences in OAR doses, with maximum dose differences of <2 Gy on average. The average TCP is 23% (± 21%) higher for HyperArc than conventional plans, with no significant differences in NTCP for the brainstem, cord, mandible, or larynx. HyperArc can achieve significant tumor dose escalation while maintaining minimal OAR doses in the head and neck—potentially enabling improved local control for rHNC SBRT patients without increased risk of treatment-related toxicities.

scholarly journals Prospective Evaluation of a Tumor Control Probability Model Based on Dynamic 18F-FMISO PET for Head and Neck Cancer Radiotherapy

2019 ◽  
Vol 60 (12) ◽  
pp. 1698-1704 ◽  
Author(s):  
Daniela Thorwarth ◽  
Stefan Welz ◽  
David Mönnich ◽  
Christina Pfannenberg ◽  
Konstantin Nikolaou ◽  
...  
Keyword(s):  
Head And Neck Cancer ◽  
Head And Neck ◽  
Neck Cancer ◽  
Probability Model ◽  
Tumor Control ◽  
Tumor Control Probability ◽  
Prospective Evaluation ◽  
Cancer Radiotherapy ◽  
Model Based

Reirradiation After Surgery and Microvascular Reconstruction

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P93-P93
Author(s):  
Jeffrey D. Suh ◽  
Brian Paul Kim ◽  
Elliot Abemayor ◽  
Joel A Sercarz ◽  
Vishad Nabili ◽  
...  
Keyword(s):  
Head And Neck Cancer ◽  
Head And Neck ◽  
Neck Cancer ◽  
Free Flap ◽  
Salvage Surgery ◽  
Late Complications ◽  
Microvascular Reconstruction ◽  
Increased Risk ◽  
Cord Injury ◽  
Recurrent Head

Problem To evaluate the outcome and complications of reirradiation of recurrent head and neck cancer after salvage surgery and microvascular reconstruction. Methods Retrospective Study. Twelve patients underwent salvage surgery with microvascular reconstruction for recurrent or new primary head and neck cancer in a previously irradiated field. Median prior RT dose was 63.0 Gy (range 30.0–72.8). Patients then underwent postoperative reirradiation, receiving a median total cumulative radiation dose of 115.0 Gy. Results Three patients (25%) experienced acute complications (<3 months) during reirradiation that resolved with conservative care. Four patients (33%) developed grade 3 or 4 late reirradiation complications (>3 months). There were no incidences of free flap failure. No patients suffered brain necrosis, spinal cord injury, or carotid rupture. The incidence of soft tissue necrosis and osteoradionecrosis was 8%. There were no treatment-related mortalities. Six patients (50%) are alive without evidence of recurrent disease a median of 40 months after reirradiation (range 4–64 months). Conclusion Free flap reconstruction followed by reirradiation is not associated with an increased risk of perioperative, acute, or late complications. Microvascular free flaps allow for maximal resection and reliable reconstruction of previously irradiated cancers before high dose reirradiation, and may reduce the incidence of severe late complications and treatment related mortality. Significance Reirradiation for recurrent head and neck squamous cell carcinoma remains controversial. However, increasing evidence has demonstrated improved survival and locoregional control with reirradiation at the cost of potentially severe or sometimes fatal radiation toxicity. We hypothesize that using well-vascularized tissue and bone at the time of salvage surgery can reduce the incidence of reirradiation complications. This would allow patients at high risk for recurrence to more safely receive a second course of radiation therapy. To our knowledge this is the first report of the effects of microvascular reconstruction on complications and outcomes of patients undergoing salvage surgery and external beam reirradiation.

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