Kaplan–Meier analysis of salivary gland tumors: prognosis and long-term survival
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We evaluated the impact of various tumor related parameters on survival probability in a cohort of patients with malignant salivary tumors, using the Kaplan–Meier analysis.
We measured patients up to 15 years following therapy, looking at T N M stage, grade perineural invasion and extra-parenchymal spread.
Of 101 patients diagnosed with various salivary malignant tumors in our medical center, 79 patients survived while 22 died with disease (DWD). The impact of distant metastasis (M+) was devastating (survival probability at 60 months and at 180 months dropped from 0.93 (M−) to 0.40 (M+) and from 0.67 to 0.40, respectively, p = 0.0001), the impact of perineural invasion was severe (at 180 months the probability of survival dropped from 0.75 to 0.21, p = 0.002). Higher stage tumor also decreased survival (from 0.82 to 0.53 at 180 months, p = 0.002) as did poor histological grade (from 0.85 to 0.48 at 180 months, p = 0.019). Neck metastasis (N+) impact was quite moderate (at 180 months the probability of survival dropped from 0.69 to 0.58, p = 0.044) while neither tumor size (T) nor extra-parenchymal spread significantly affected survival.
Salivary tumor location and its potential to infiltrate nerves and blood vessels and to metastasize is the most telling parameter. Systemic therapy aimed at halting distant metastatic spread is the most effective therapeutic goal. Dissection of N0 neck metastasis is not necessarily a valuable treatment.
KeywordsSalivary tumors Survival Prognosis Kaplan–Meier Perineural Extra-parenchymal
This study did not receive funding of any kind.
Compliance with ethical standards
Conflict of interest
Yair Israel declares no conflict of interest, financial or otherwise, relating to this study. Adi Rachmiel declares no conflict of interest, financial or otherwise, relating to this study. Konstantin Gourevich declares no conflict of interest, financial or otherwise, relating to this study. Rafael Nagler declares no conflict of interest, financial or otherwise, relating to this study.
Research involving human participants and/or animals
This article does not contain any studies with human participants or animals performed by any of the authors.
Informed consent forms were not necessary for this study, as the study had no effect on patient management or identification.
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