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Comparison of platinum monotherapy with concurrent chemoradiation therapy versus platinum-based dual drug therapy with concurrent chemoradiation therapy for locally advanced cervical cancer: a systematic review and meta-analysis

Infectious Agents and Cancer volume 17, Article number: 18 (2022) Cite this article

Abstract

Objective

To compare the survival outcomes and adverse events of patients with locally advanced cervical cancer (LACC) who received platinum monotherapy with concurrent chemoradiation therapy (CCRT) versus platinum-based dual drug therapy with CCRT.

Method

All relevant literature was screened form the PubMed, EMBASE, Web of Science, The Cochrane Library and other databases from their establishment to October 2020. The main endpoint indicators included overall survival (OS) and progression-free survival (PFS). Grade 3 and above adverse events induced by chemotherapy were also compared.

Results

This study involved 17 literature and 4,106 patients. There were 2,066 patients treated with CCRT with platinum-based dual drug therapy and 2,040 patients received CCRT with platinum monotherapy. Meta-analysis results showed that, compared to CCRT with platinum monotherapy, OS (HR = 0.68, 95% CI 0.58–0.79) and PFS (HR = 0.67, 95% CI 0.58–0.77) of LACC patients were significantly improved by CCRT with platinum-based dual drug therapy. In addition, CCRT with platinum-based dual drug therapy led to more adverse reactions such as neutropenia (OR = 4.92, 95% CI 3.55–6.84), anemia (OR = 1.99, 95% CI 1.17–3.39), diarrhea (OR = 1.70, 95% CI 1.30–2.22), leukopenia (OR = 2.42, 95%CI 1.84–3.17), thrombocytopenia (OR = 2.87, 95%CI 1.44–5.72), etc.

Conclusion

CCRT with platinum-based dual drug therapy improved OS and PFS of LACC patients relative to the CCRT with platinum monotherapy. But it also increased the adverse reactions caused by multiple chemotherapy drugs. Thus, it is crucial to select a proper chemotherapy regimen based on the actual tolerance of patients in clinical practice.

Introduction

Cervical cancer is the fourth most frequent cancer in women throughout the world, followed by lung cancer, colon cancer, and breast cancer [1]. Patients with cervical cancer are usually diagnosed in the advanced stage. Locally advanced cervical cancer (LACC) refers to local tumor with a diameter greater than 4 cm in the narrow sense and refers to stage IB2-IVA cervical cancer in the broad sense [2]. The latest National Comprehensive Cancer Network (NCCN) guidelines recommend concurrent chemoradiation therapy (CCRT) including external radiotherapy and brachytherapy, which is the standard treatment method for LACC patients [3, 4]. Although CCRT can reduce recurrence and improve survival, clinical outcomes in patients are far from satisfactory.

Several studies compared the efficacy of platinum-based chemotherapy combinations in advanced cervical cancer patients. For example, a phase III randomized controlled trial compares the efficacy and safety of cisplatin with or without S-1 in stage IVB, recurrent, or persistent cervical cancer patients, while S-1 plus cisplatin does not show superiority over cisplatin alone in OS but it remarkably increases PFS [5]. Another retrospective study compared the efficacy of paclitaxel/ifosfamide/platinum triplet and paclitaxel/cisplatin doublet on patients with metastatic, recurrent, or persistent cervical cancer, showing a higher response rate than paclitaxel/platinum without an increase in severe complications [6]. Therefore, it was speculated that platinum-based combination chemotherapy may be an effective measure for CCRT in LACC patients, though in some studies this therapy did not show an advantage. Combination chemotherapy with cisplatin and paclitaxel along with radiotherapy in LACC patients is well-tolerated, but it seems that no increase existed in tumor response and progression-free survival (PFS) [7]. It was also suggested that adding gemcitabine at the CCRT phase does not provide substantially superior results, but treatment toxicities may be increased [8]. Therefore, the survival benefit of combination chemotherapy remained to be confirmed. This study compared the efficacy and safety of CCRT with platinum-based dual drug therapy versus CCRT with platinum monotherapy in the treatment of LACC via systematic review and meta-analysis, so as to offer references for the treatment selection of LACC patients.

Methods

Literature retrieval

Current systematic reviews and meta-analyses followed Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRIAMA) statement [9]. Relevant literature in PubMed, EMBASE, Web of Science, The Cochrane Library and other databases were searched from their establishment to October 2020, using the keywords: ‘cervical cancer’, ‘cervical carcinoma’, ‘uterine cervix cancer’, ‘concurrent chemoradiotherapy’, ‘CCRT’, ‘concurrent radiotherapy and chemotherapy’ and ‘chemoradiotherapy’ in the ‘title’ and ‘abstract’ section with Medical Subject Heading (MeSH) terms and their combinations. All retrieved literature and their references were reviewed to include all literature that might meet the requirements. The specific retrieval strategy was as follows: (((cervical[Title/Abstract]) OR (cervix*[Title/Abstract])) AND (((cancer*[Title/Abstract]) OR (carcinoma*[Title/Abstract])) OR (neoplasm*[Title/Abstract]))) AND (((Chemoradiotherap*[Title/Abstract]) OR (Radiochemotherap*[Title/Abstract])) AND (((Concurrent[Title/Abstract]) OR (Synchronous*[Title/Abstract])) OR (Concomitant*[Title/Abstract]))).

Selection of literature

The relevant literature was selected based on the following criteria: (1) Subjects: patients were pathologically diagnosed with LACC (clinical stage IIB-IVA according to the International Federation of Gynecology and Obstetrics (FIGO)); (2) All the included studies were retrospective or prospective randomized controlled trials comparing CCRT with platinum-based dual drug therapy versus CCRT with platinum monotherapy; (3) The primary endpoint indicators included OS and PFS, and the secondary endpoint indicator included grade 3 and above adverse reactions caused by chemotherapy. Exclusion criteria: (1) Studies of patients (FIGO IB-IIB) receiving preoperative neoadjuvant chemoradiotherapy or postoperative adjuvant CCRT; (2) Patients with recurrences or distant metastases and patients with severe medical diseases (performance status (PS) ≥ 2); (3) Non-English literature or Chinese literature; (4) Comments, reviews, meta-analyses, case reports, letters, expert opinions, etc.

Data extraction and quality assessment

Data were independently extracted by two investigators, and disputes were negotiated by a third investigator. Data were extracted from the literature as follows: author, year of publication, study type, FIGO stage, median age, treatment, and sample size. Primary endpoints included OS and PFS, while HR and 95% CI were extracted from complete OS curves or sufficient survival data. In addition, grade 3 and above chemotherapy-related adverse reactions were assessed. Literature quality was evaluated using the Cochrane bias risk assessment tool. The scale assessed the risk of bias for each included literature from the following 6 aspects with 7 items in total: selection (including random sequence and allocation concealment), implementation (double-blind), measuring (blind evaluation of the results), the follow-up (integrity of endpoint data), report (results of selective reports) and others (other bias sources). The results of “low risk bias”, “high risk bias” and “unclear” were made for each item based on the bias risk assessment criteria.

Statistical analysis

The extracted data were statistically analyzed by Stata 14.0 software. The heterogeneity of the results was verified and assessed by X2 test and represented by I2 index or p-value. No significant heterogeneity was in the included studies when P > 0.1 or I2 < 50%, with application of the fixed-effect model. Otherwise, random-effect model was used. Subgroup analysis was performed to explain the underlying source of heterogeneity if significant heterogeneity occurred in the included studies. HR and 95% CI data were extracted from survival data (OS and PFS) to represent treatment effects. HR < 1 indicated a better survival in platinum doublets group. When HR was not provided in the original text, we used Engauge Digitizer 4.1 software to estimate HR from survival curves. OR was used to represent the aggregate outcome of adverse events. OR > 1 indicated that adverse events occurred more frequently in the CCRT with platinum-based dual drug therapy group. Additionally, publication bias was evaluated by visual funnel plot and Egger regression asymmetry test, and P < 0.05 was defined as statistically significant.

Results

Literature retrieval results

Through the retrieval strategy formulated above, a total of 3,015 literature was found. 896 duplicated literature was discarded and other 2,073 literature was removed by browsing titles and abstracts. Thus, 46 literature was selected for full-text paper review and 17 literature was included in this study. Screening process for the literature was shown in Fig. 1.

Fig. 1
figure 1

Flow of retrieving the literature

Full size image

Basic features of literature and results of quality assessment

This study included 17 literature with 4,106 patients, while the literature consisted of 5 retrospective studies [10,11,12,13,14] and 12 prospective studies [4, 8, 15,16,17,18,19,20,21,22,23,24]. Among them, 2,066 patients received platinum-based dual drug therapy combining CCRT, while 2,040 patients received platinum monotherapy combining CCRT. Except for 5 retrospective studies, the rest were prospective studies. Basic features of the included literature were displayed in Table 1. The quality assessment results were shown in Fig. 2.

Table 1 The basic features of the included literature
Full size table
Fig. 2
figure 2

Results of Cochrane risk bias assessment

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Results of meta-analysis

Evaluation of OS and PFS

The results of OS were reported in 17 studies, comprising 5 retrospective studies and 12 prospective studies. Since there was no heterogeneity (I2 = 0.0%, P = 0.504) confirmed through these studies, we used a fixed-effect model for analysis. The results of meta-analysis showed that CCRT with platinum-based dual drug therapy notably improved OS of LACC patients (HR = 0.68, 95% CI 0.58–0.79). The subgroup analysis on prospective studies exhibited that patients received platinum-based dual drug therapy combining CCRT had long OS (HR = 0.66, 95% CI 0.53–0.78), as displayed in Fig. 3.

Fig. 3
figure 3

Forest plot of OS pooled results

Full size image

The results of PFS were reported in 15 studies, containing 5 retrospective studies and 10 prospective studies, showing low heterogeneity (I2 = 28.1%, P = 0.148). The results of meta-analysis showed that CCRT with platinum-based dual drug therapy remarkably prolonged PFS (HR = 0.67, 95% CI 0.58–0.77). The subgroup analysis on prospective studies illustrated that platinum-based dual drug therapy combining CCRT ameliorated patients’ PFS (HR = 0.75, 95% CI 0.60–0.89), as represented in Fig. 4. In conclusion, CCRT with platinum-based dual drug therapy presented more significant efficacy and significantly prolonged the survival of LACC patients, which had a broad application prospect.

Fig. 4
figure 4

Forest plot of PFS pooled results

Full size image

Analysis of adverse events

In addition, we performed a pooled analysis of grade 3 and above chemotherapy-related adverse events (Fig. 5). There were prominent differences in adverse events except for vomiting (OR = 1.25, 95% CI 0.95–1.65). Neutropenia (OR = 4.92, 95% CI 3.55–6.84), anemia (OR = 1.99, 95% CI 1.17–3.39), diarrhea (OR = 1.70, 95% CI 1.30–2.22), leukopenia (OR = 2.42, 95% CI 1.84–3.17), thrombocytopenia (OR = 2.87, 95% CI 1.44–5.72), etc. were significantly increased in the CCRT with platinum-based dual drug therapy group. It was obvious that multiple chemotherapeutic drugs would increase the occurrence of adverse events. Thus, the advantages and disadvantages should be weighed to maximize the survival of patients.

Fig. 5
figure 5

Forest plot of pooled results of adverse events

Full size image

Publication bias

It was found that the funnel plot was basically symmetrical by observing visually. Assessed by Egger’s test (OS, P = 0.611; PFS, P = 0973), publication bias was not existed (Fig. 6). The evidence indicated that the included studies had no effect on the results of the meta-analysis.

Fig. 6
figure 6

Publication bias. A OS of Begg’s test. B OS of Egger’s test. C PFS of Begg’s test. D PFS of Egger’s test

Full size image

Discussion

CCRT is used as a standard nursing regimen for LACC patients, but whether CCRT with platinum-based dual drug therapy is more effective than the CCRT with platinum monotherapy needs to be further analyzed. It was indicated that CCRT with platinum-based dual drug therapy significantly improved OS and PFS of patients. Meanwhile, multiple combinations of chemotherapeutic drugs increased the adverse events caused by chemotherapy.

The main difference in efficacy is the combination of chemotherapy drugs. Cisplatin and carboplatin are two platinum drugs commonly used in chemotherapy. It is investigated that the main role of chemotherapy in CCRT is to enhance the sensitivity of radiotherapy (RT), and carboplatin concomitant with RT has similar efficacy and safety with single cisplatin [25, 26]. Similarly, another study confirmed this conclusion. The combined chemotherapy regimen is usually platinum chemicals combining docetaxel, paclitaxel, gemcitabine, fluorouracil, etc. A previous meta-analysis demonstrated the efficacy and safety of different concomitant chemotherapy in LACC patients and showed that CCRT (cisplatin + docetaxel) may be the optimal choice of CCRT regimens for LACC patients [27]. Notably, a retrospective study indicated that elderly LACC patients are well tolerated and achieved favorable survival outcomes after CCRT with platinum doublets agent [28]. Of course, differences in radiation intensity in each study cannot be ruled out. For example, intensity-modulated radiotherapy (IMRT) for cervical cancer can significantly reduce the incidence of acute enteritis, while standard three-dimensional conformal radiotherapy (3D CRT) shows no conspicuous difference in overall and disease-free survival [29]. A recent meta-analysis also compared the treatment outcomes of RT with CCRT with platinum-based doublets versus RT plus platinum single-agent therapy in LACC patients. The results showed that under the premise of good tolerance, LACC patients’ survival was extended via treating with RT plus platinum-based doublet therapy improves survival compared to RT plus platinum single-agent therapy [30], which were the same as our results. In addition, a large amount of recent literature was included in our study to ensure the robustness of the results. 5 retrospective studies and 12 prospective studies constituted the 17 included literature, which, associating with the further subgroup analysis on the prospective studies, suggested that CCRT with platinum-based dual drug therapy prolonged the OS and PFS of patients.

There are some limitations here. Firstly, we did not analyze the prognostic results of different types of cervical cancer. It was demonstrated that CCRT plays a vital role in treatment of LACC [31]. Secondly, in the included clinical trials, the chemotherapy schedules and timetable of patients were significantly different. As shown previously, paclitaxel plus cisplatin is the best chemotherapy regimen for cervical cancer [32]. Subsequently, the results of a recent phase III trial indicated that carboplatin-based regimen has similar efficacy with lower toxicity compared to cisplatin. Thus, carboplatin can be a standard treatment option instead of cisplatin [33]. Only two studies based on carboplatin doublets were included in our meta-analysis. Therefore, more clinical studies are needed to confirm the specific efficacy of these two platinum drugs in CCRT for patients with LACC.

In conclusion, CCRT with platinum-based dual drug therapy significantly improved the survival but increased adverse events of LACC patients compared to CCRT with platinum monotherapy. Thus, the actual tolerance of patients should be considered when choosing the best regimen.

Availability of data and materials

The data used to support the findings of this study are included within the article.

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Authors and Affiliations

  1. Department of Gynecology, The First People’s Hospital of Chenzhou City, No.102, Luojiajing, Beihu District, Chenzhou City, 423000, Hunan Province, China

    Ting Deng, Jianchi Wu & Yuanyi Yu

  2. Department of Oncology, The First People’s Hospital of Chenzhou City, Chenzhou City, 423000, Hunan Province, China

    Shequn Gu

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Deng, T., Gu, S., Wu, J. et al. Comparison of platinum monotherapy with concurrent chemoradiation therapy versus platinum-based dual drug therapy with concurrent chemoradiation therapy for locally advanced cervical cancer: a systematic review and meta-analysis. Infect Agents Cancer 17, 18 (2022). https://doi.org/10.1186/s13027-022-00433-3

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Keywords

  • Locally advanced cervical cancer
  • Chemotherapy
  • Concurrent chemoradiation therapy
  • Platinum
  • Meta-analysis