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Laryngoscope. 2019 Apr;129(4):883-889. doi: 10.1002/lary.27444. Epub 2018 Aug 27.

Adjuvant Chemotherapy Is Associated With Improved Survival for Late-Stage Salivary Squamous Cell Carcinoma.

Author information

1
Division of Otolaryngology, Department of Surgery, New Haven, Connecticut, U.S.A.
2
Department of Medicine, New Haven, Connecticut, U.S.A.
3
Yale Cancer Center, New Haven, Connecticut, U.S.A.
4
Department of Therapeutic Radiology, New Haven, Connecticut, U.S.A.
5
Department of Pathology, Yale School of Medicine, New Haven, Connecticut, U.S.A.

Abstract

OBJECTIVE:

Salivary squamous cell carcinomas (SCCs) represent a unique disease entity because many are thought to represent metastases from primary cutaneous malignancies. Nevertheless, they represent a significant proportion of parotid gland cancers and have a notably poor prognosis. Recently, there has been controversy regarding the utility of adjuvant chemotherapy in the treatment of these malignancies, with most studies concluding that there is no survival benefit. We aim to determine the outcomes associated with the use of adjuvant radiotherapy and chemoradiotherapy in the treatment of early- and late-stage salivary SCC.

METHODS:

A retrospective study of 2,285 of surgically resected adult salivary SCC diagnosed from 2004 to 2014 in the National Cancer Database was conducted. Patients were divided into early- (I/II) and late-stage (III/IV) groups. Demographic, facility, tumor, and survival variables were included in the analyses. Multivariate Cox survival regressions, propensity-score matched analyses, and univariate Kaplan-Meier analyses were conducted.

RESULTS:

The use of adjuvant chemoradiotherapy for late-stage patients was associated with improved survival compared to the use of adjuvant radiotherapy alone (hazard ratio [HR] 0.774, P = 0.026). Five-year survival for late-stage patients treated with surgery alone, surgery with adjuvant radiotherapy, and surgery with adjuvant chemoradiotherapy was 31.1% (standard error [SE]: 2.5), 45.6% (SE: 2.2), and 58.9% (SE: 3.4). Use of adjuvant therapy (either chemoradiotherapy or radiotherapy alone) was associated with improved survival for early-stage patients (HR 0.746, P = 0.037).

CONCLUSION:

The addition of chemotherapy to the adjuvant therapy of late-stage patients with salivary SCC may result in improved long-term survival. Expanded use of adjuvant therapy for early-stage disease may also improve patient outcomes.

LEVEL OF EVIDENCE:

4 Laryngoscope, 129:883-889, 2019.

KEYWORDS:

Adjuvant therapy; NCDB; adjuvant chemotherapy; outcomes; salivary squamous cell carcinoma; survival

PMID:
30151947
DOI:
10.1002/lary.27444
[Indexed for MEDLINE]

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