Research ArticleClinical Studies
Open Access

The Modified Glasgow Prognostic Score and Prognostic Nutritional Index as Prognostic Markers in Patients With Metastatic Breast Cancer Treated With Eribulin

SHINYA YAMAMOTO, SHOKO ADACHI, TOMOKO WADA, KAZUTAKA NARUI, AKI KIMURA, MASANORI OSHI, AKIMITSU YAMADA, TOSHIHIRO MISUMI and ITARU ENDO
In Vivo July 2022, 36 (4) 1854-1859; DOI: https://doi.org/10.21873/invivo.12903

Abstract

Aim: To examine the role of the Modified Glasgow Prognostic Score (mGPS) and Prognostic Nutritional Index (PNI) as prognostic markers for patients with metastatic breast cancer (MBC). Patients and Methods: We investigated the associations of clinico-pathological factors with time-to-treatment failure (TTF) and overall survival (OS) in 110 patients with MBC treated with eribulin. Results: C-Reactive protein >1 mg/dl, albumin <3.5 g/dl, mGPS=2, and PNI <40 were significant predictors of shorter TTF in univariate analyses. PNI <40 remained a significant and independent predictor of shorter TTF in multivariate analyses. De novo tumor, visceral metastases, C-reactive protein >1 mg/dl, albumin <3.5 g/dl, mGPS=2, and PNI <40 were significant predictors of poor OS at the univariate level. A PNI <40 was a significant and independent predictor of poor OS in multivariate analyses. Conclusion: PNI is a reliable predictor of TTF and OS in patients with MBC treated with eribulin.

Key Words:

Breast cancer is the most common form of cancer worldwide (1). Although drug treatment has advanced, metastatic breast cancer (MBC) is still difficult to cure. Various drugs have been developed to treat MBC. Many studies have examined predictors of outcome and poor prognosis in patients with MBC.

Eribulin mesylate (eribulin) is an inhibitor of microtubule dynamics. It is distinct from other tubulin-targeting agents, since it inhibits the microtubule growth phase without affecting the shortening phase (2). The EMBRACE study showed that eribulin significantly prolongs overall survival (OS) compared to standard treatment in women with human epidermal growth factor receptor 2 (HER2)-negative MBC (2). Several prognostic markers for MBC have been identified, including the absolute lymphocyte count (ALC), neutrophil-to-lymphocyte ratio (NLR), and platelet-to-lymphocyte ratio (PLR) (3-5). In a post-hoc analysis of the EMBRACE study, Miyoshi et al. (3) identified an ALC of ≥1500/μl as a significant predictor of better OS in patients with MBC treated with eribulin. Miyagawa et al. (4) reported that the progression-free survival (PFS) of patients with an NLR <3 was significantly longer than that of patients with an NLR≥3. Koyama et al. (5) reported that ALC and PLR were significantly associated with OS.

On the other hand, other multi-marker prognostic models for different cancer types have been developed. These include the Glasgow Prognostic Score (GPS) calculated from C-reactive protein (CRP) and serum albumin levels, and the Prognostic Nutritional Index (PNI) calculated from albumin and ALC, which have been reported for other carcinomas. The GPS was originally reported for non-small-cell lung cancer (6), and then the modified GPS (mGPS) was developed for colorectal cancer (7) and validated in other carcinoma types (8). The PNI was developed for gastrointestinal cancer (9) and reported for other carcinomas (10). There are few studies on these markers as predictors of prognosis in patients with MBC treated with eribulin. The present study thus investigated the utility of mGPS and PNI compared to existing laboratory-based prognostic markers (ALC, NLR, PLR) for HER2-negative cancer in order to predict outcome in patients treated with eribulin.

Patients and Methods

Patients. A total of 110 consecutively enrolled patients treated with eribulin for HER2-negative MBC at our institutions between January 2012 and September 2021 were included in present study. Clinical data were collected retrospectively. The present study was approved by the Yokohama City University Medical Center Ethics Committee (B200900015) and Yokohama City University Hospital Ethics Committee (B200700008). Informed consent was obtained using an opt-out system.

Treatment and outcome. Eribulin was administered intravenously at 1.4 mg/m2 on days 1 and 8 of each 21-day cycle. When patients were unable to tolerate this dose due to adverse events, the dose was reduced to 1.1 or 0.7 mg/m2, or the treatment schedule was changed to bi-weekly. Treatment was continued until disease progression or intolerable toxicity developed. Disease progression was determined by comprehensive judgment based on radiological findings, clinical symptoms, laboratory data, and other findings. Time to treatment failure (TTF) and OS were calculated. TTF was defined as the duration of administration of eribulin. OS was defined from the date of eribulin initiation to the date of death from any cause.

Evaluation of predictors. We collected baseline data before the first eribulin administration including neutrophil, lymphocyte, and platelet counts, as well as CRP, albumin, carbohydrate antigen 15-3, and carcinoembryonic antigen levels. These data were used to calculate the NLR and PLR. The mGPS score was derived as follows: Score 0: CRP ≤1.0 mg/dl; score 1: CRP >1.0 mg/dl and albumin ≥3.5 g/dl, Score 2: CRP >1.0 mg/dl and albumin <3.5 g/dl. The PNI was calculated as follows: 10×albumin in g/dl+0.005×lymphocytes/μl. The cut-off value was determined based on literature (3, 4, 8, 10, 11): NLR: 3, ALC: 1,500/μl, PLR: 200, mGPS: 1, and PNI: 40. ER or PgR positivity was defined as a positive cell rate of >1% (12). The cut-off values for carbohydrate antigen 15-3 and carcinoembryonic antigen were 25 U/ml and 5.0 ng/ml, respectively (13).

Statistical analysis. Baseline characteristics were summarized by descriptive statistics. Univariate and multivariate analyses for TTF and OS were calculated using a Cox proportional hazards model to obtain the hazard ratio (HR) and 95% confidence interval (CI). TTF and OS were estimated using the Kaplan-Meier method and groups were compared using log-rank tests. A two-sided value of p<0.05 was considered statistically significant. All statistical analyses were performed using Bell Curve version 3.20 for Excel (Social Survey Research Information, Tokyo, Japan).

Results

Patient characteristics. The characteristics of patients included in present study are shown in Table I. There was one male patient in the present study. Most patients had ER-positive disease (68.2%). The majority of patients had an ALC of <1500/μl (70.9%), mGPS of 0-1T (82.7%) and PNI≥40 (74.5%). The median follow-up was 12.1 months (range=0.2-85.8 months).

View this table:
Table I.

Patient characteristics.

Predictors of TTF. The results of univariate Cox regression analysis for factors associated with TTF are shown in Table II. CRP >1 mg/dl, albumin <3.5 g/dl, mGPS of 2, and PNI <40 were significantly associated with shorter TTF. Factors which were significant (p<0.05) at the univariate analysis were entered into a multivariate analysis model. However, since CRP and albumin, being components of the mGPS, are strongly correlated with mGPS, only the latter of these significant variables was used. The results of the multivariate Cox regression analysis are shown in Table II. A PNI <40 was confirmed as a significant and independent prognostic marker for shorter TTF (HR=3.135, 95% CI=1.704-5.747, p<0.001).

View this table:
Table II.

Univariate and multivariate analyses of each factor for time-to-treatment failure.

Predictors of OS. The results of univariate Cox regression analysis for factors associated with OS are shown in Table III. De novo tumor, present of visceral metastasis, CRP >1 mg/dl, albumin ≤3.5 g/dl, mGPS=2, and PNI <40 were significant factors resulting in poor OS. In multivariate analysis, mGPS was used, and CRP and albumin were excluded, as with TTF. The results of the multivariate Cox regression analysis modelling predictors of OS are shown in Table III. A PNI <40 was confirmed as a significant and independent predictor of poor OS (HR=6.711, 95% CI=2.899-15.625, p<0.001).

View this table:
Table III.

Univariate and multivariate analyses of each factor for overall survival.

Kaplan-Meier survival curve analysis. Kaplan-Meier survival curves for TTF and OS compared between patients stratified according to mGPS and PNI are shown in Figure 1. A mGPS of 0-1 was associated with a significantly longer median TTF than a mGPS of 2 (4.4 vs. 2.1 months, p=0.002) (Figure 1A). The median TTF was significantly longer in patients with a PNI ≥40 compared to patients with a PNI <40 (4.6 vs. 2.0 months, p<0.001) (Figure 1B). A mGPS of 0-1 was associated with a significantly longer OS than a mGPS of 2 (17.4 vs. 4.2 months, p<0.001) (Figure 1C). A PNI ≥40 was associated with a significantly longer OS than a PNI <40 (18.3 months vs. 4.2 months, p<0.001) (Figure 1D).

Figure 1.
Figure 1.

Output summaries of Kaplan-Meier survival curve analysis according to Modified Glasgow Prognostic Score (mGPS) and Prognostic Nutritional Index (PNI). A: A mGPS of 0-1 was associated with a significantly longer time to treatment failure compared to a mGPS of 2 (4.4 vs. 2.1 months, p=0.002). B: The median time to treatment failure of patients with a PNI ≥40 was significant longer than that of patients with a PNI <40 (4.6 vs. 2.0 months, p<0.001). C: A mGPS of 0-1 was associated with significantly longer overall survival compared to a mGPS of 2 (17.4 vs. 4.2 months, p<0.001). D: A PNI ≥40 was associated with significantly longer overall survival compared to a PNI <40 (18.3 vs. 4.2 months, p<0.001).

Discussion

To the best of our knowledge, this is the first study to evaluate the role of mGPS for the prognostication of patients with HER2-negative MBC treated with eribulin. Both mGPS and PNI were associated with significantly better TTF and OS in univariate analyses; however, only PNI was associated with significantly better TTF and OS in multivariate analyses. ALC, NLR and PLR were not significant markers of TTF and OS in present study.

The mGPS has been widely validated as a marker of systemic inflammation (14). Proctor et al. identified mGPS as a powerful prognostic factor in various cancer types including breast cancer (15). However, their study examined the relationship between the mGPS upon diagnosis of a malignant tumor and survival. In keeping with the link between MBC treated with eribulin and inflammation, Sata et al. reported that baseline levels of CRP, as well as the NLR and ALC, were significantly associated with OS (11). Inflammation is an important driver of tumor progression. The tumor microenvironment is orchestrated by inflammatory cells, which play an essential role in the proliferation, survival, and migration of cancer cells (16). Thus, it is plausible that mGPS may be prognostic marker; however, it was not found to be a significant marker in our multivariate analysis. Therefore, the PNI was considered to be a more useful factor in patients with MBC treated with eribulin.

The PNI is a marker of nutrition and systemic immune status. In the present study, PNI was a significant predictor of TTF and OS in patients with MBC treated with eribulin. Similar results were reported by Oba et al. (17), who found an association between a higher PNI and longer OS (HR=0.27, p=0.0068) in a sample of 60 patients. The PNI has also been described as a useful prognostic marker in patients with other malignant tumors (10, 18-20).

The antitumor effects of eribulin are driven in part by modulation of the immune system (21). Lymphocytes play an important role in antitumor immune responses (5). Therefore, it is reasonable for the PNI to be a prognostic marker, however, the ALC alone was not a significant marker. Thus, albumin, which reflects nutritional status, seemed to play an important role, because albumin was included in the formulas used to calculate the mGPS and PNI. Albumin alone was also significantly associated with a better prognosis in univariate analyses. However, albumin was not a significant independent predictor in the multivariate analysis when albumin and CRP instead of mGPS were input (data not shown). A complex index of nutrition and immunity seems to be important for predicting prognosis in patients with MBC treated with eribulin.

The treatment approach for patients with a poor prognosis who were included in the present study was not investigated, however, it is an urgent issue. Since patients with a low PNI had a poor prognosis, improving nutritional and immune status is important. Oba et al. closely monitored the results of an ongoing clinical trial examining whether nutritional intervention could improve treatment outcomes in patients with MBC (NCT03045289). We are also looking for a similar way to maintain the PNI.

The present study has several limitations. Firstly, we did not examine whether the associations of mGPS and PNI with prognosis in patients with MBC are specific to being treated with eribulin, or also extend to other forms of treatment. Secondly, this was a retrospective study with a small sample size. There is a need for more multi-center studies with larger cohorts to validate our results.

In conclusion, we found that the PNI was a strong predictor of prognosis in patients with MBC treated with eribulin. Maintaining nutritional and immunological status might improve survival in patients with MBC. In the future, we would like to validate our results in a larger cohort.

Acknowledgements

The Authors would like to thank Editage for English language editing.

Footnotes

  • Authors’ Contributions

    SY designed the study, collected the clinical data, analyzed statistics, and wrote the article. SA, TW, AK collected the clinical data. KN, AY collected the clinical data and revised the article. MO designed the study and collected the clinical data. TM analyzed statistics. IE revised the article. All Authors read and approved the article.

  • Conflicts of Interest

    SY received research honoraria from Esai, Chugai, Novartis. AY received honoraria from AstraZeneca, Chugai, Daiichi Sankyo, Eisai, Eli Lily, Kyowa Kirin, Nihon Medi-Physics, Nippon Kayaku, Pfizer, and Taiho. K.N. received honoraria from EISAI, Nippon Kayaku, Kyowa Kirin, Novartis, AstraZeneca, Eli Lilly, Pfizer. IE received grants from Asahikasei, Ono, Taiho, Chugai, Eisai, Takeda and Eli Lilly; and honoraria from Asahikasei. The other Authors declare that they have no conflicts of interest related this study.

  • Received March 19, 2022.
  • Revision received April 21, 2022.
  • Accepted April 29, 2022.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY-NC-ND) 4.0 international license (https://creativecommons.org/licenses/by-nc-nd/4.0).

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The Modified Glasgow Prognostic Score and Prognostic Nutritional Index as Prognostic Markers in Patients With Metastatic Breast Cancer Treated With Eribulin
SHINYA YAMAMOTO, SHOKO ADACHI, TOMOKO WADA, KAZUTAKA NARUI, AKI KIMURA, MASANORI OSHI, AKIMITSU YAMADA, TOSHIHIRO MISUMI, ITARU ENDO
In Vivo Jul 2022, 36 (4) 1854-1859; DOI: 10.21873/invivo.12903
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