Phase II study: Induction chemotherapy and transoral surgery as definitive treatment (Tx) for locally advanced oropharyngeal squamous cell carcinoma (OPSCC)—An update and retrospective review of non-study patients.

Authors

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Robert S. Siegel

George Washington University School of Medicine, Washington, DC

Robert S. Siegel , Arjun Joshi , Reza Taheri , Nader Sadeghi , Punam Thakkar , Anonglack Vongpachith , Joseph Goodman

Organizations

George Washington University School of Medicine, Washington, DC, George Washington University Medical Center, Washington, DC, McGill University Health Centre, Montréal, QC, Canada, The George Washington University, Washington, DC

Research Funding

Other

Background: The standard of care for OPSCC includes chemoradiation (CRT) or surgery with adjuvant radiation (RT). However, RT is associated with significant life long morbidity. We assessed the efficacy of a two-drug induction regimen, followed by transoral robotic assisted surgery (TORS) & neck dissection for locally advanced OPSCC. Methods: This is an IRB approved single-arm phase II study for untreated stage III or IVA (AJCC 7th edition) OPSCC patients (pts) with an ECOG < 2 and GFR > 50 cc. Induction cisplatin 75 mg/m2 and docetaxel 75 mg/m2 was administered every 21 days for 3 cycles. Patients then underwent TORS and neck dissection(s). At post-op visits, flexible laryngoscopy, blood tests, and imaging with PET/CT and/or MRI were done. Short and long term toxicity, progression-free survival, overall survival, and quality of life (QOL) were evaluated in all pts. Results: Twenty oropharyngeal pts were treated, 19 were male, 17 were Caucasian, and 19 were HPV+. Median age at dx was 57. Three pts were stage III, and 17 were stage IVA. Pathologic CR at the primary site occurred in 15 pts and CR among LN neck dissections occurred in 13 pts. Four pts were given dose-reduced chemo and 1 pt was changed to carboplatin per protocol because of renal dysfunction. Pre vs post tx QOL scores did not change. At a mean follow-up of 33 months (range 19.6 to 44.1), 18 pts are alive and NED. Three pts recurred a mean of 2.2 mos after surgery, and were treated with salvage CRT. Two pts died of metastatic disease, the third is alive and well. All 3 pts had positive LN (9 LN, 3 LN and 1 LN) at surgery. A fourth pt had 12 pos LN and received radiation. He has not recurred. A retrospective review of an additional 20 twenty pts treated in the same way, were also reviewed for efficacy. Mean age was 61.5. Two pts died of metastatic disease. Fourteen pts have been followed for > 7 mos, and their mean overall survival is 44 mos. Conclusions: Cisplatin + docetaxel followed by TORS & neck dissection(s) appears to be an effective model for the definitive treatment for OPSCC, while avoiding the adverse effects of RT.

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Abstract Details

Meeting

2019 ASCO Annual Meeting

Session Type

Poster Session

Session Title

Head and Neck Cancer

Track

Head and Neck Cancer

Sub Track

Local-Regional Disease

Citation

J Clin Oncol 37, 2019 (suppl; abstr 6072)

DOI

10.1200/JCO.2019.37.15_suppl.6072

Abstract #

6072

Poster Bd #

61

Abstract Disclosures