<abstract xmlns="http://www.w3.org/1999/xhtml"> Background. The results of RTOG-MRC randomized trial of photon (n=15) versus neutron (n=17) therapy in the 1980’s reported an improved local control (LC) with neutron radiotherapy for unresectable salivary gland tumors. Due to increased severe toxicity with neutron radiotherapy and the paucity of neutron-therapy centers, we analyzed our institution’s results of photon radiotherapy for unresectable salivary gland tumors. Patients and methods. From 1990 to 2009, 27 patients with unresectable salivary gland cancer underwent definitive photon radiotherapy at our institution. Nodal involvement on presentation was found in 9 patients. Median dose of radiotherapy was 70 Gy. Chemotherapy was given to 18 patients, most being platinum-based regimens. Local control (LC), locoregional control (LRC), distant metastasis-free survival (DMFS), overall survival (OS), and toxicity outcomes were assessed. Results. With a median follow-up of 52.4 months, the 2/5-year actuarial LC was 69% (95%CI ± 21.0%)/55% (± 24.2%), LRC was 65% (± 21.4%)/47% (± 21.6%), and DMFS was 71% (± 21.8%)/51% (± 22.8%), respectively using competing risk analysis. The median OS was 25.7 months, and the 2/5-year OS rates were 50% (± 19.0%)/29% (± 16.6%), respectively. Higher histologic grade was significant for an increased rate of DM (intermediate grade vs. low grade, p=0.04, HR 7.93; high grade vs. low grade, p=0.01, HR 13.50). Thirteen (48%) patient’s experienced acute grade 3 toxicity. Late grade 3 toxicity occurred in three (11%) patients. Conclusions. Our data compares favorably to neutron radiotherapy with fewer late complications. Photon radiotherapy is an acceptable alternative to neutron radiotherapy in patients who present with unresectable salivary gland tumors.</abstract>

Background. The results of RTOG-MRC randomized trial of photon (n=15) versus neutron (n=17) therapy in the 1980’s reported an improved local control (LC) with neutron radiotherapy for unresectable salivary gland tumors. Due to increased severe toxicity with neutron radiotherapy and the paucity of neutron-therapy centers, we analyzed our institution’s results of photon radiotherapy for unresectable salivary gland tumors. Patients and methods. From 1990 to 2009, 27 patients with unresectable salivary gland cancer underwent definitive photon radiotherapy at our institution. Nodal involvement on presentation was found in 9 patients. Median dose of radiotherapy was 70 Gy. Chemotherapy was given to 18 patients, most being platinum-based regimens. Local control (LC), locoregional control (LRC), distant metastasis-free survival (DMFS), overall survival (OS), and toxicity outcomes were assessed. Results. With a median follow-up of 52.4 months, the 2/5-year actuarial LC was 69% (95%CI ± 21.0%)/55% (± 24.2%), LRC was 65% (± 21.4%)/47% (± 21.6%), and DMFS was 71% (± 21.8%)/51% (± 22.8%), respectively using competing risk analysis. The median OS was 25.7 months, and the 2/5-year OS rates were 50% (± 19.0%)/29% (± 16.6%), respectively. Higher histologic grade was significant for an increased rate of DM (intermediate grade vs. low grade, p=0.04, HR 7.93; high grade vs. low grade, p=0.01, HR 13.50). Thirteen (48%) patient’s experienced acute grade 3 toxicity. Late grade 3 toxicity occurred in three (11%) patients. Conclusions. Our data compares favorably to neutron radiotherapy with fewer late complications. Photon radiotherapy is an acceptable alternative to neutron radiotherapy in patients who present with unresectable salivary gland tumors.

Results of photon radiotherapy for unresectable salivary gland tumors: is neutron radiotherapy’s local control superior?

Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA

Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY, USA

Department of Head and Neck Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, USA

Radiology and Oncology

Background. The results of RTOG-MRC randomized trial of photon (n=15) versus neutron (n=17) therapy in the 1980’s reported an improved local control (LC) with...

Results of photon radiotherapy for unresectable salivary gland tumors: is neutron radiotherapy’s local control superior?

Publié en ligne: 22 janv. 2014

Pages: 56 - 61

DOI: https://doi.org/10.2478/raon-2013-0046

Mots clés
photon, neutron, radiotherapy, salivary gland cancer, IMRT

This content is open access.

Results of photon radiotherapy for unresectable salivary gland tumors: is neutron radiotherapy’s local control superior?

Publié en ligne: 22 janv. 2014

Pages: 56 - 61

DOI: https://doi.org/10.2478/raon-2013-0046

Mots clésphoton, neutron, radiotherapy, salivary gland cancer, IMRT

This content is open access.

Mots clés
photon, neutron, radiotherapy, salivary gland cancer, IMRT