- Research article
- Open Access
Nomograms to predict the prognosis in locally advanced oral squamous cell carcinoma after curative resection
BMC Cancer volume 21, Article number: 372 (2021)
Oral squamous cell carcinoma (OSCC) is the dominant histologic type of oral cancer. Locally advanced OSCC remains a major therapeutic challenge. Our study aimed to develop and validate nomograms predicting survival prognosis in patients with locally advanced oral squamous cell carcinoma (OSCC) after curative resection.
A total of 269 consecutive patients with primary OSCC who received curative resection between September 2007 and March 2020 were retrospectively enrolled in our study. Patients were randomly assigned to the training cohort (n = 201) or the validation cohort (n = 68). Multivariate Cox regression analyses were conducted to determine independent prognostic factors for overall survival (OS) and cancer specific survival (CSS) in the training set, which were used to develop nomogram models estimating 3-, and 5-year OS and CSS. We also evaluated the nomograms using concordance indices (c-index), calibration curves, and decision curve analyses (DCA), and compared those with the AJCC 8th staging system. The results were externally validated in the validation cohort.
Age, Kaplan-Feinstein (KFI) index, pT, the number of positive nodes and systemic inflammatory index (SII) were significant prognostic predictors for OS and CSS. The OS nomogram had c-index values of 0.712 in the training set and 0.697 in the validation set, while the CSS nomogram exhibited c-index values of 0.709 in the training set and 0.675 in the validation set. These data were superior to those of AJCC 8th staging system, suggesting high discriminative ability of the nomograms. Calibration curves exhibited good agreement between observed and predicted survival. DCA curves indicated the nomograms were with potential clinical usefulness. These results were validated in the validation set.
The novel nomograms incorporating clinically available characteristics for OS and CSS prediction were developed in the locally advanced OSCC patients after curative surgery. Validation revealed good discrimination and calibration, indicating the clinical utility of the nomograms in the individualized prognosis prediction of locally advanced OSCC after curative surgery.
Oral cavity cancer is one of the most common malignancies worldwide, with an estimated incidence of 355,000 new cases per year . Oral squamous cell carcinoma (OSCC), the dominant histologic type of oral cancer, accounts for 95% of oral tumors . The overall age standardized incidence rate is 21 per 100,000 in male and 17 per 100,000 in female . Despite the spreading of multimodal treatment approaches, the prognosis of OSCC, especially locally advanced OSCC, have not improved significantly for the past 30 years [4,5,6]. Locally advanced OSCC remains a major therapeutic challenge. A better understanding of the prognostic factors is necessary for appropriate risk stratification of patients, optimization of therapeutic approaches and individualization of patient care.
The staging of OSCC based on American Joint Committee on Cancer (AJCC) TNM system has been used for several years to estimate OSCC patients’ survival in clinical practice . However, the traditional TNM staging system only considers several clinical pathological features. In addition to these, the prognosis of OSCC related to a series of factors includes the other clinical pathological features for example, tumor site, tumor grade, and presence of lymphovascular invasion, as well as the patient specific characteristics such as age, smoking and comorbidities . Hence, the consideration of a set of prognostic relevant clinical-pathologic factors could offer more accurate prognostic information.
Various reports have shed light on the probable prognostic significance of certain biomarkers in the setting of OSCC, of which serum biomarkers are of potential clinical utility due to their feasibility and accessibility. Multiple serum biomarkers including lymphocyte count, neutrophil-lymphocyte ratio (NLR), and platelet–lymphocyte ratio (PLR) have been proposed and validated as significant prognosticators in a broad spectrum of cancer [9,10,11,12]. Recently, the systemic immune-inflammation index (SII) combining neutrophil, lymphocyte and platelet, has been reported to provide prognostic information in several malignancies. Diao P et al.  found that preoperative SII could serve as a powerful prognostic predictor in patients with primary OSCC.
Prognostic models integrating a set of clinical attributes offer greater precision in clinical outcome prediction. Nomograms are statistical tools to visualize complex models that use a set of clinical characteristics for prediction of individual patient’s outcome . Nowadays, nomograms have been widely used as a user-friendly tool to evaluate the prognosis of various cancers [15,16,17]. What’s more, the recurrence and staging of prostate cancers via nomograms have been included into the NCCN clinical guidelines . However, nomograms for predicting the prognosis of locally advanced OSCC is scarce.
The present study was a retrospective analysis of a cohort of patients with locally advanced OSCC in an academic tertiary care center. The aim of our study was to determine the prognostic significance of different clinical-pathologic factors, and establish the first nomograms using the most relevant prognostic factors to estimate the probabilities of overall survival (OS), and cancer specific survival (CSS) in patients with locally advanced OSCC for better risk stratification and clinical decision-making.
From September 2007 to March 2020, a total of 497 patients with OSCC underwent the curative resection at an university hospital were retrospectively recruited. All patients were histopathologically confirmed of locally advanced (stage III or IV non-metastatic) OSCC. Of these, we excluded 228 patients: 55 had recurrent or metastasized cancer, 29 had other concomitant primary cancer, 25 had other concomitant primary cancer, 40 had preoperative chemotherapy/radiotherapy or contradictions of surgery, 29 had incomplete medical records and 50 were lost to follow up. The remaining 269 patients were enrolled in our study. The primary tumor resection was performed per our institutional guidelines. Following the surgery, the pathological TNM classification was established using the AJCC 8th edition. Postoperative chemotherapy and/or radiotherapy were performed selectively based on our institutional guidelines.
Two thirds of these patients were randomly assigned to the training set (n = 201) to establish the predictive models and the remaining patients (n = 68) were assigned to the validation set to evaluate the performance of the models.
Patients’ data were collected from electronic records including age at diagnosis, gender, comorbidity, smoking status, preoperative blood tests, TNM stage, tumor grade, presence of perineural invasion, depth of tumor invasion, number of positive nodes, lymphovascular invasion, primary tumor site, extracapsular extension, bone invasion, and safety margins. All identifiable information stored was strictly followed per the hospital’s guidance. Cigarette smokers were defined as individuals who reported having smoked more than 100 cigarettes during their life time and/or smoked every day for at least 1 year. The pathological TNM classification of all tumors was established per the AJCC Staging Manual (2010). Patient comorbidity was assessed by using the Kaplan-Feinstein index (KFI) .
The whole blood samples for neutrophil, monocyte and platelet counts were harvested within 3 days before surgery. Systemic inflammatory index (SII), was calculated from preoperative counts of peripheral blood platelets (P), neutrophils (N) and lymphocytes (L) per the following equation: SII = P × N/L. NLR and PLR were defined as follows: NLR = N/L, PLR = P/L. SPSS software was used to investigate the cut-off values of SII, NLR and PLR for OS. The results revealed that the optimal cut-off values were of 535.5 for SII, 2.8 for NLR and 162.5 for PLR.
After discharge, patients were followed-up every 3 months for the first three years, every 6 months until 5 years and annually thereafter. OS was defined as the time interval from the date of surgery to the end of the study or death. CSS was defined as the time elapsed between the date of surgery and the death attributed to OSCC, or the end of the study.
All the procedures involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study has been approved by the ethics committee of The Second Hospital of Dalian Medical University. Informed consent was obtained from all patients.
Continuous variables were compared by Student’s t test or Mann-Whitney U test, while categorical variables were compared by Chi-square test or Fisher’s exact test. OS and CSS were estimated by Kaplan-Meier method and the statistical differences in survival compared by log-rank tests. COX proportional hazards regression models were used to identify the independent prognostic predictors for OS and CSS. Subsequently, these significant predictors in the training set were used to establish nomogram models via the rms package in R software. We evaluated the predictive performance by the concordance index (c-index) values and calibration with 1000 bootstrap resampling. The rcorrcens command was used to acquire c-index values and the calibrate command was to obtain the calibration plots. The c-index was calculated to quantify the predictive accuracy of the nomograms. Calibration plots were generated to check the consistency between the predicted and observed probabilities . In the external validation, the total points of each patient were generated based on the established nomograms. Thereafter, the Cox regression analyses were carried out by using the patients’ total points as a factor. Additionally, c-index values and calibration curves were derived in the validation set. Decision curve analysis (DCA) was employed to examine the clinical net benefit of a predictive model by the rmda package in R software . Finally, we compared the performance of the nomograms with AJCC 8th edition TNM staging system by using the c-index values and DCA methods.
All statistical analyses were analyzed using SPSS 22.0 software (SPSS, Inc., Chicago, IL, USA) and R software version 3.5.2 (https://www.r-project.org)with R packages cmprsk, rmda, rms, and survival packages. A two-tailed P value < 0.05 was considered statistically significant.
Clinicopathological characteristics of the study cohort
A total of 269 OSCC patients (204 male and 65 female), with a median age of 62 years (range, 21–85 years) were enrolled in this study. The tumors were most frequently located on the mobile tongue and floor of the mouth. 67.9% of the patients were well or moderately differentiated. Cervical lymph node dissection was performed in 266 patients. Regarding the treatment, 113 patients received radiotherapy exclusively after surgery, 100 patients underwent concomitant radiotherapy and chemotherapy after surgery, and 51 patients just had surgical resection without adjuvant radiotherapy. Table 1 presented patient demographic and tumor variables of the study cohort. In total, 201 patients were assigned into the training set, while 68 patients were assigned into the validation set. The two groups exhibited similar demographic and tumor parameters (P < 0.05).
The median follow-up period was 55 months (ranging from 2 to 95 months). At the end of follow-up, a total of 115 patients died, with 74 patients dying of cancer-related causes and 41 patients dying of other causes.
In the training set, the OS rates at 3- and 5-year were 66.4% (95%CI: 63.5–69.3%) and 55.6% (95%CI: 49.5–61.7%), respectively, while the CSS rates at 3- and 5-year were 78.3 and 66.2% respectively. In the validation set, the OS rates at 3- and 5-year were 63.0 and 55.4%, respectively, while the CSS rates at 3- and 5-year were 70.2 and 61.6%, respectively.
The results of the univariate and multivariate models for OS are provided in Table 2. Age, KFI index, pT, pN, AJCC stage, the number of positive nodes, NLR, PLR and SII were significant predictors of OS in the univariate analysis. In the multivariate analysis results showed that, age (P < 0.001), KFI index (P = 0.003), pT (P < 0.001), the number of positive nodes (P = 0.009) and SII (P < 0.001) remained to be significant prognosticators.
In the univariate analysis, age, KFI index, pT, pN, AJCC stage, the number of positive nodes, safety margins, SII, NLR and PLR had a statistically significant impact on CSS. The results of multivariate model demonstrated the following variables as potential independent risk factors of CSS: age (P < 0.001), KFI index (P = 0.003), pT (P = 0.003), the number of positive nodes (P = 0.008) and SII (P < 0.001) (Table 3).
Based on the results of COX regression analyses, we constructed prognostic nomograms for 3-year and 5-year OS and CSS (Fig. 1). The point of each factor can be determined by drawing the vertical line from the variable to the point axis. By summing up the total score and locating it on the total point scale, we can get the estimated survival probability at each time point.
Nomogram validation was assessed using the c-index values and calibration curves. The c-index values showed that the established nomograms had good discriminative abilities with 0.712 for OS and 0.709 for CSS. Figure 2 showed the calibration plots for the nomogram models of OS and CSS in the training set, in which nomograms predicated OS and CSS probabilities were well matched with the actual probabilities.
When subjected to the external validation, the nomograms also discriminated to a good extent with c index values of 0.697 for OS and 0.675 for CSS. Calibration plots (Fig. 3) indicated the good consistency between nomograms predicted and actual probabilities in validation set, which suggested the good accuracy of the established nomograms.
Survival analyses according to the risk stratification based on the nomograms
The total points of each patient were generated from the established nomograms. All the patients were evenly divided into three subgroups per the total points. With regards for OS, the three groups were low risk group (≤145), medium risk group (145–190), and high risk group (>190). For CSS, the three groups were low risk group (≤102), medium risk group (102–141), and high risk group (>141). As shown in Fig. 4, patients in the high risk group had distinctly lower OS and CSS survival probabilities (P < 0.001).
Comparison of the nomogram with the AJCC staging
Compared to the AJCC staging system, our nomograms had statistically higher c-indices for OS and CSS prediction in locally advanced OSCC patients, which were summarized in Table 4. DCA has been proposed as a method to assess the clinical validity of the prediction models. The DCA plots demonstrated the established nomogram models were associated with improved clinical net benefits over the AJCC stages with wider ranges of threshold probabilities in both training (Fig. 5) and validation sets (Fig. 6).
Nomograms enable visualize the prognostic strength of various relevant factors in a single model which allow them to have more accurate survival prediction than conventional TNM staging system or an individual molecular biomarker. Nomograms have been widespread used in the prognosis prediction in clinical oncology. Compared with other cancers, nomograms have been sparingly studied for head and neck tumors. For OSCC, several studies have reported on the development of nomograms to predict the survival [22,23,24,25]. However, to our knowledge, there was no study specifically for the locally advanced OSCC patients. The present study was the first attempt to investigate the usage of nomograms for survival prediction of locally advanced OSCC.
Our nomograms were constructed based on the COX proportional hazards regression analyses in the training cohort of 201 locally advanced OSCC patients after curative surgery. In the multivariate analyses, we found that advanced age, KFI, pT, the number of positive nodes and SII were significant prognosticators for OS and CSS. Based on these significant prognosticators, we developed the nomograms for OS and CSS. The nomograms showed good discrimination abilities with c-index values of 0.712 for OS and 0.709 for CSS. Calibration curves demonstrated satisfactory agreement between the nomograms and actual survival. Moreover, the nomograms exhibited the net clinical benefit using DCA. We also externally validated the nomograms performance in a validation cohort of 68 patients. External validation also supported the satisfactory accuracy and calibration of our nomograms. Besides, the performance of nomograms was, in turn, validated by Kaplan-Meier curves which showed distinct prognosis in three subgroups sorting by the total points of the nomograms.
The significant prognosticators incorporated in our nomograms were clinically feasible and economical, especially including the novel preoperative systemic inflammation-immune biomarker SII. Notably, accumulating evidence demonstrated that inflammatory cells including neutrophils, platelets, monocytes and lymphocytes carry out a robust role in contributing to proliferation and survival of malignant cells, angiogenesis and metastasis . Many reports also have revealed the significant prognostic values of preoperative systemic inflammation-immune biomarkers, for example, NLR, PLR and LMR, in various types of cancers [9,10,11,12]. Recently, SII based on neutrophils, lymphocytes and platelets, has been proved as a novel integrated biomarker and exhibited prognostic value in several tumors including advanced pancreatic cancer , cervical cancer , gastric cancer  and colorectal cancer . The study published in 2018  reported for the first time that increased preoperative SII level was associated with poor outcome and could be served as an independent prognostic predictor for OSCC. Elevated SII probably resulted from neutrophilia, thrombocythemia and lymphopenia. Solid tumor-related neutrophilia, after excluding obvious reasons such as infections, bone marrow metastasis and the usage of corticosteroid, may arise from hematopoietic colony-stimulating factors and inflammatory cytokines triggered by tumors including granulocyte colony-stimulating factor and others [31, 32]. Neutrophils could facilitate tumor growth by the secretion of various chemokines and cytokines, as well as actively recruiting other tumor-supporting cells to the tumor microenvironment . What’s more, tumor associated neutrophils play a critical role in the metastasis process by inhibiting the activity of natural killer cells and enhancing the extravasation of tumor cells, mainly through secreting various matrix metalloproteinases to degrade and modify the extracellular matrix . Thrombocythemia usually promote tumor progression and metastasis. Studies showed that abnormally elevated platelet count over 3.5 × 1011/L probably increased cancer risk by 3% in one year of observation [35, 36]. A meta-analysis reported platelet quantity could be a potential prognostic marker in pancreatic cancer . Tumors firstly activate platelets through tissue factors-containing microparticles (MPs). The platelet MPs can express signals and communicate with a variety of cells to induce angiogenesis [38, 39]. Also platelets or platelet activation can directly interact with cancer cells, synergistically promotes TGF-β and NF-kB pathways in cancer which in turn triggers the epithelial mesenchymal transition of cancer cells to facilitate tumor metastasis . Lymphopenia has been frequently observed in patients with advanced cancers and shown as a powerful prognostic factor in advanced solid tumors including renal cell carcinoma, colorectal, lung cancer and breast cancer [40,41,42,43]. Lymphocytes as major immune cells exert a fundamental role in cell-mediated immunologic destruction of cancer cells, although different subtypes of lymphocytes vary in their functional roles against cancer [44, 45]. Thus, lymphopenia could be considered as indicative of impaired immune surveillance and contribute to the favorable tumor microenvironment for tumor metastasis. In our study, multivariate analyses revealed that SII was a powerful prognosticator of OS and CSS in advanced OSCC.
Concerning clinical-pathologic factors, the most important prognosticators were age, comorbidity, depth of invasion (DOI), extranodal extension (ENE), number of positive nodes, perineural invasion (PNI) and tumor grade. Advanced age and greater comorbidity have been reported by various studies on the upper aerodigestive tract tumors, as elderly patients or patients in poor general health are more vulnerable to disease progression and not eligible for invasive therapies. Consistent with previous findings, our data also confirmed advanced age and greater comorbidity as the independently clinical prognostic factors in advanced OSCC patients. Tumor grade wasn’t identified as a prognostic factor in our data, which probably can be explained by the homogeneity of the study population in terms of patients and tumor profiles.
DOI has been advocated to be associated with tumor metastasis and worse survival outcomes, and included in the AJCC 8th T staging classification. In our study, pT classification was independently associated with worse prognosis. Lymph nodal involvement has been a well-established prognostic factor in head and neck cancers. The AJCC 8th staging has included lymph nodal site (ipsilateral and contralateral), size, presence of ENE in the nodal staging category. The negative impact of ENE has been fully incorporated in the AJCC 8th N staging system, where it leads to upstaging nodal positive OSCC, whatever size, number, or laterality of the positive node(s) . However, the number of lymph node is probably overestimated in the system. AJCC 8th N staging classified patients with more than one lymph node as N2, without further stratification for the increasing number of positive lymph nodes. Several clinical studies have observed the prognostic significance of number of positive lymph nodes in OSCC, albeit with different cut-off values . Roberts et al.  reported that the number of positive lymph nodes model (0, 1, 2–4 and ≥ 5) performed better than AJCC 7th edition N staging model in head and neck cancers. Moreover, a recent publication by Rajappa et al.  revealed that the number of positive lymph nodes (0, 1, 2, > 2) outperformed AJCC 8th nodal staging system in the prediction of OS and disease free survival in oral cancer. Subramaniam et al.  categorized the number of positive lymph nodes as 0, 1–2, 3–4 and ≥ 5 and exhibited it was superior to LNR and log odds of positive lymph nodes in the prediction of OS and DFS in 643 OSCC patients. In our study, we adopted the categorization system proposed by Subramaniam et al. . We also observed the inverse relationship between the number of positive lymph nodes and patients’ survival, and confirmed its prognostic significance for OS and CSS in advanced OSCC patients.
Based on the independent prognosticators discussed above, we built the first nomograms predicting OS and CSS in locally advanced OSCC patients and internal and external validations showed our models with relatively high c-indices and well-fitted calibration curves. Currently, AJCC 8th staging system is the widely used system for assessment of prognosis in locally advanced OSCC patients. We performed comparative analysis between our developed nomograms and AJCC staging system. Our nomograms outperformed the AJCC 8th staging system for OS and CSS prediction in locally advanced OSCC patients, with statistically higher c-indices. Additionally, in the DCA analyses, the nomograms exhibited to be more beneficial over AJCC 8th staging system in the prognosis prediction of OS and CSS. These data demonstrated that our nomograms had better performance with clinical utility in prognosis prediction.
The present study had two main limitations. Firstly, our study was a retrospective study so that the selection bias was inevitable. Secondly, the patients enrolled were from a single institution, which may not represent the entire locally advanced OSCC patients. Notwithstanding these limitations, our study built the first nomograms predicting OS and CSS in locally advanced OSCC patients. More importantly, robust internal and external validation demonstrated sufficient discriminatory power and accurate calibration in our proposed nomograms. Additionally, the main advantages of the present study were that all the included prognosticators were feasible and accessible in daily clinical practice.
In conclusion, we constructed and validated nomograms based on clinically available characteristics for predicting 3- and 5- year OS and CSS in patients with locally advanced OSCC. The novel nomograms displayed relatively good performance with potential clinical utility, which would aid the individualized risk stratifying the patients and contribute to the individualized disease management.
Availability of data and materials
The data used in the current study are available from the corresponding author upon reasonable request.
American Joint Committee on Cancer
Cancer specific survival
Depth of invasion
Oral squamous cell carcinoma
and platelet–lymphocyte ratio
Systemic immune-inflammation index
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Nie, Z., Zhao, P., Shang, Y. et al. Nomograms to predict the prognosis in locally advanced oral squamous cell carcinoma after curative resection. BMC Cancer 21, 372 (2021). https://doi.org/10.1186/s12885-021-08106-x
- Oral squamous cell carcinoma
- Cancer management