Gemcitabine and Docetaxel Combination for Advanced Soft Tissue Sarcoma: A Nationwide Retrospective Study

Yunjung Choi; Mi Sun Yun; Sang Hee Lim; Jeeyun Lee; Jin-Hee Ahn; Yu Jung Kim; Kyong Hwa Park; Young Suk Park; Ho Yeong Lim; Hyonggin An; Dong-Churl Suh; Yeul Hong Kim

doi:10.4143/crt.2016.535

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Original Article Gemcitabine and Docetaxel Combination for Advanced Soft Tissue Sarcoma: A Nationwide Retrospective Study: Yunjung Choi, MPH^1,2, Mi Sun Yun, RN¹, Sang Hee Lim, MS¹, Jeeyun Lee, MD, PhD³, Jin-Hee Ahn, MD, PhD⁴, Yu Jung Kim, MD, PhD⁵, Kyong Hwa Park, MD, PhD⁶, Young Suk Park, MD, PhD^3,7, Ho Yeong Lim, MD, PhD^3,7, Hyonggin An, PhD⁸, Dong-Churl Suh, PhD^2,, Yeul Hong Kim, MD, PhD^6,7,; Cancer Research and Treatment : Official Journal of Korean Cancer Association 2018;50(1):175-182.
DOI: https://doi.org/10.4143/crt.2016.535
Published online: March 30, 2017

¹Department of Pharmaceutical Management, Health Insurance Review & Assessment, Wonju, Korea

²College of Pharmacy, Health, Social & Clinical Pharmacy, Chung-Ang University, Seoul, Korea

³Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea

⁴Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

⁵Division of Hematology and Medical Oncology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea

⁶Division of Oncology/Hematology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea

⁷Cancer Deliberation Committee, Health Insurance Review & Assessment Service, Wonju, Korea

⁸Department of Biostatistics, Korea University College of Medicine, Seoul, Korea

Correspondence: Yeul Hong Kim, MD, PhD Division of Oncology/Hematology, Department of Internal Medicine, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul 02841, Korea
Tel: 82-2-920-5569 Fax: 82-2-926-4534 E-mail: yhk0215@korea.ac.kr

Co-correspondence: Dong-Churl Suh, PhD College of Pharmacy Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
Tel: 82-2-820-5600 Fax: 82-2-813-0650 E-mail: dongsuh75@gmail.com

• Received: November 10, 2016 • Accepted: March 15, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Purpose
This nationwide retrospective study was conducted to evaluate the efficacy and safety of combined gemcitabine and docetaxel (GD) as an off-label therapy for advanced soft tissue sarcoma, which has limited treatment options owing to its rare occurrence.
Materials and Methods
A total of 228 patients received GD therapy for advanced soft tissue sarcoma from 2009 to 2014 in Korea. We retrospectively reviewed the clinical medical records and claims data of these patients.
Results
A total of 218 patients in 20 medical centers were included in the final analysis (median age, 50.0 years). The objective response rate was 15.1% (34/218, in the leiomyosarcoma subgroup; 26.3%). The median overall survival and progression-free survival were 10.3 months (95% confidence interval [CI], 8.4 to 12.2) and 3.3 months (95% CI, 2.8 to 4.7), respectively. The treatment was discontinued in 7.8% of patients owing to adverse events; however, there was no adverse event-related death. Neutropenia (35.7%) and anemia (15.1%) were the most frequent grade 3/4 toxicities. Univariate analysis for identifying the predictors of the progression-free survival period revealed that patients aged ≤ 50 years had a hazard ratio of 1.388 (95% CI, 1.027 to 1.875; p < 0.05) relative to those aged > 50 years, and the group with leiomyosarcoma had a hazard ratio of 0.693 (95% CI, 0.493 to 0.975; p < 0.05) relative to the group with other histopathological subtypes.
Conclusion
GD therapy was tolerable and effective for Korean patients with soft tissue sarcoma. In conclusion, for patients with advanced soft tissue sarcoma, especially leiomyosarcoma, GD therapy could be an important therapeutic option.
Key words: Advanced soft tissue sarcoma, Gemcitabine, Docetaxel, Off-label use, Retrospective study

Introduction

Soft tissue sarcoma refers to a type of malignant tumor that originates in the mesodermal tissues. This condition accounts for less than 1% of all cancers that occur in humans and is classified into 50 or more histopathological subtypes, such as leiomyosarcoma (LMS), liposarcoma, and others [1,2]. Anthracycline-based chemotherapy (e.g., doxorubicin and ifosfamide combination) is the most commonly used first-line drug therapy for soft tissue sarcoma [3-5], and when such therapy fails, high-dosage ifosfamide, pazopanib alone, or gemcitabine and docetaxel combination is administered [1,6-10].

Among the second-line therapies for soft tissue sarcoma, gemcitabine and docetaxel combination is an off-label regimen that can only be used in approved hospitals in Korea. Gemcitabine and docetaxel have been not approved for advanced soft tissue sarcoma by the Korea Ministry of Food and Drug Safety. However, this regimen has been in off-label use since February 2009 with prior approval from the Korean Health Insurance Review & Assessment Service (HIRA), and as of 2014, it has been used for 228 cases. In Korea, patients with advanced soft tissue sarcoma who failed anthracycline-based chemotherapy were usually administered a gemcitabine and docetaxel combination between 2009 and 2014.

This Korean nationwide retrospective study was conducted to evaluate the efficacy and safety of combined gemcitabine and docetaxel as an off-label therapy for advanced soft tissue sarcoma.

Materials and Methods

1. Patients

A total of 228 patients received combined gemcitabine and docetaxel for advanced soft tissue sarcoma at 20 medical centers beginning in February 2009, when it was first approved as an off-label regimen, and continuing until 2014. The patients were diagnosed with soft tissue sarcoma and received one or more anticancer therapies that failed; therefore, they subsequently received gemcitabine and docetaxel combination therapy for cancer metastasis or recurrence.

In these patients, the histopathological subtypes included alveolar soft-part sarcoma, desmoplastic small round cell tumor, epithelioid sarcoma, gastrointestinal stromal tumor, neuroectodermal tumor, fibrosarcoma, LMS, liposarcoma, malignant fibrous histiocytoma, malignant hemangiopericytoma, malignant peripheral nerve sheath tumor, and synovial sarcoma. Because clear cell sarcoma, extraskeletal chondrosarcoma, extraskeletal osteosarcoma, and Ewing’s sarcoma/primitive neuroectodermal tumors are histopathological types not approved for this off-label regimen by HIRA, patients with these subtypes were excluded from this study.

This study was approved by the Institutional Review Board of the HIRA in Korea (2015-013-001).

2. Data collection

Twenty medical centers that were approved for the off-label use of combined gemcitabine and docetaxel had their patient medical records provided to HIRA for evaluation of off-label use. Data were collected from the medical records of these patients. Information regarding the patients’ demographic characteristics, such as age and sex; disease characteristics, such as histopathological classification and site of origin; treatment effects; and adverse events was obtained. In addition, health insurance claims data for the use of gemcitabine and docetaxel combination were reviewed to confirm the patient’s age, date of disease progression and date of death.

3. Chemotherapy treatment

The patients were administered (1) a single cycle of gemcitabine 1,000 mg/m² intravenously (D1, D8) and docetaxel 35 mg/m² intravenously (D1, D8) every 21 days or (2) gemcitabine 900 mg/m² intravenously (D1, D8) and docetaxel 75-100 mg/m² intravenously (D1) every 21 days. When administering this regimen, each medical center performed a drug response evaluation every 2-3 cycles. The drug administration was discontinued if the disease progressed or a serious adverse event occurred, and initiating the next cycle of chemotherapy was allowed if tumors showed complete response (CR), partial response (PR), or stable disease (SD).

4. Efficacy

Efficacy was based on the Response Evaluation Criteria In Solid Tumors (RECIST) ver. 1.1 performed by each medical center. Based on the best tumor response observed after therapy, tumor responses were classified as CR, PR, SD, or progressive disease (PD). The objective tumor response rate was defined as CR+PR. Cases that did not belong to any of these classifications or when a tumor response could not be evaluated were marked as not evaluable. The progression-free survival (PFS) period was defined as the time from the start of the therapy to the date of disease progression or death.

5. Toxicity

Hematological adverse events were evaluated using National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) ver. 4.0 with reference to hematocrit, white blood cell (WBC), and platelet counts. In addition, nonhematological adverse events were obtained from the patients' medical records.

6. Statistical analysis

Statistical analysis of the data was conducted using SAS EG 4.3 (SAS Institute Inc., Cary, NC). The patients’ characteristics, response rates, and adverse events were analyzed. Survival was analyzed using the Kaplan-Meier survival estimation method. In addition, the Cox proportional hazards model was applied to analyze the prognosticators of PFS and overall survival, with p < 0.05 set as the statistical significance level.

Results

1. Patient characteristics

A total of 218 patients from 20 medical centers were included in the final analysis. From all initially reported cases, 10 were excluded, including nine with unreliable histopathological reports and one case of patient information entry error. The patient population consisted of 111 men (50.9%) and 107 women (49.1%) with a median age of 50.0 years (range, 18 to 77 years). The percentage of patients with metastasis and recurrence was 71.4% and 28.1%, respectively. With respect to performance status, the majority of the patients (81.7%) had an Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or I, while 12.4% and 2.3% of patients had ECOG scores of II and III, respectively. Patients who had undergone surgical treatment accounted for 82.1%, while 50.5% had undergone radiation therapy, 58.1% received one type of chemotherapy, and 40.9% received two or more types of chemotherapy. The abdomen-retroperitoneum-pelvis was the most common site of cancer origin (49.1%), followed in order by the extremities, chest, internal organs, other sites, and head and neck (Table 1).

2. Efficacy

The percentage of patients who had a dose reduction was 45.8%, and the actual dose intensity received was 95% of the dose intensity approved by the HIRA. The primary cause of the dose reduction was adverse events (52.6%), with approximately 19% occurring because of old age or patient condition. In 3.7% of the cases, the dose was slightly increased and the number of chemotherapy cycles was three. Among the 218 patients who were included in the final analysis, 196 had RECIST reports available, while response evaluation could not be performed in 22 patients because of early termination of treatment or other reasons.

For all 218 patients, tumor response evaluations were based on the best response among all evaluations. The results showed one patient with CR (0.5%), 33 patients with PR (15.1%), 83 patients with SD (38.1%), and 83 patients with PD (38.1%), indicating that the objective tumor response rate was 15.6% (Table 2). Among the histopathological subtypes, LMS showed a higher response rate of 26.3% (15/57), the response rate for malignant fibrous histiocytoma was 11.1% (4/35), that for liposarcoma was 14.8% (4/27), and that for synovial sarcoma was 10.5% (2/19) (Table 3). With regard to drug administration, the 1-week regimen, in which docetaxel was administered twice at intervals of 1 week (gemcitabine 1,000 mg/m², D1, D8; docetaxel 35 mg/m², D1, D8), resulted in a higher response rate of 19% (20/104), while the response rate was 11.7% (13/111) for the 3-week regimen, where docetaxel was administered every 3 weeks (gemcitabine 1,000 mg/m², D1, D8+docetaxel 75-100 mg/m² D1).

The median PFS and overall survival durations analyzed using the Kaplan-Meier survival estimation method were 3.3 months (95% confidence interval [CI], 2.8 to 4.7) and 10.3 months (95% CI, 8.4 to 12.2), respectively (Figs. 1 and 2) in the median follow-up period of 343 days. There were no significant differences among tissue types, but there was a significant PFS difference between LMS (median PFS, 5.8 months) and all other tissue types (median PFS, 3.0 months) (Fig. 3).

Univariate analysis for identifying the predictors of the PFS period revealed that patients aged ≤ 50 years had a hazard ratio of 1.388 (95% CI, 1.027 to 1.875; p < 0.05) relative to those aged > 50 years, and that those with LMS (n=57; median age, 50.0) had a hazard ratio of 0.693 (95% CI, 0.493 to 0.975; p < 0.05) relative to the group with other histopathological subtypes (n=160; median age, 50.0) (Table 4).

3. Toxicity

Hematological adverse events were evaluated using NCI-CTCAE ver. 4.0 with reference to hematocrit, WBC, and platelet counts from the clinical evaluations performed by each medical center. The results showed grade 3 (G3) or higher adverse events of neutropenia (78 of 218 patients, 35.7%), anemia (15.1%), thrombocytopenia (11.4%), and febrile neutropenia (7.4%) (Table 5). In addition, G3 or higher nonhematological adverse events reported included nausea/vomiting (1.4%), general weakness (1.4%), fatigue (1.4%), myalgia (1.0%), and skin rash (1.4%). Discontinuation of the drug owing to adverse events occurred in 7.8% of the cases; however, there was no adverse event-related death.

Discussion

Soft tissue sarcoma, a relatively rare cancer, has 50 or more histopathological subtypes, such as LMS and liposarcoma, and it may appear heterogeneous depending on the histopathological subtype [1,6,7]. Only a few effective chemotherapy regimens are currently available for treatment of advanced soft tissue sarcoma, and there have been very few phase III clinical trials of second-line chemotherapy [6-10].

There have been a few clinical trials of gemcitabine and docetaxel combination therapy, which is recommended as a second-line chemotherapy regimen for soft tissue sarcoma; however, the largest retrospective study reported to date is the 2006 French study of 133 patients with soft tissue sarcoma from 10 institutions [11]. In that study, the overall response to gemcitabine and docetaxel combination therapy was 18.4% and the median overall survival was 12.1 months. In the current study, which examined 218 Korean patients, the objective response rate was 15.6%, while the median overall survival was 10.3 months. It is difficult to compare the results from these two studies since they evaluated patients from different countries in different clinical settings. However, both studies are significant because they were relatively large multicenter studies that reflected real clinical settings and evaluated a rare cancer for which it is difficult to perform phase III clinical trials.

In the French study, uterine LMS, a histopathological subtype that is relatively more responsive, accounted for a significantly higher proportion (57.1%) of cases, and the subtypes of uterine LMS showed higher response rates than those of other subtypes of soft tissue sarcoma (24% vs. 10.4%), but the differences were not statistically significant (p= 0.06). In addition, patients with uterine LMS had a longer survival than those with other subtypes of soft tissue sarcoma (p=0.01). In our study, subtypes of LMS affected approximately 26% of our patients and the response rate in these patients was 26.3%. In our analysis of prognosticators of PFS, patients with LMS had significant differences, with a hazard ratio of 0.693 (95% CI, 0.493 to 0.975; p < 0.05) compared to those with other subtypes.

Another study using gemcitabine and docetaxel combination therapy for soft tissue sarcoma was an open randomized trial that compared the administration of gemcitabine alone versus gemcitabine and docetaxel combination in 122 patients with various histopathological forms of unresectable soft tissue sarcoma, excluding Kaposi’s sarcoma and gastrointestinal stromal tumors [12]. In that study, gemcitabine and docetaxel combination therapy resulted in a higher response rate than gemcitabine alone (16% vs. 8%), and showed prolongation of PFS (6.2 months vs. 3.0 months) and overall survival (17.9 months vs. 11.5 months).

Other studies were a Japanese study that retrospectively analyzed the medical records of 64 patients with progressed soft tissue sarcoma [13], a German study that examined 17 patients with epithelioid sarcoma from three institutions [14], an American study of 19 patients with recurrent, refractory pediatric soft tissue sarcoma from a single pediatric hospital [15], a German study of 34 patients with soft tissue sarcoma from a single institution [16], as well as Korean studies that include a phase II clinical trial with 24 patients with soft tissue sarcoma from four institutions [17] and a retrospective study of 22 patients with soft tissue sarcoma from a single Korean institution [18].

The current study investigated the efficacy and safety of combined gemcitabine and docetaxel in 218 patients, representing all cases of its use for soft tissue sarcoma in Korea. However, it should be noted that this study has some limitations. First, this study was based on patient case report forms collected retrospectively for evaluation of the use of anticancer drug off-label therapy; therefore, there were qualitative limitations of the data (such as missing adverse reactions and dosage changes). In addition, despite the multicenter studies, a central review of responses and adverse reactions could not be conducted owing to limited human and material resources, although hematologic toxicity was evaluated directly at the central lab using the clinical data of each hospital. Thus, it seems that the number of patients who reported nonhematological toxicities was somewhat lower than that reported in previous prospective studies. Moreover, because the data were collected retrospectively, it should be noted that there was some heterogeneity in patient characteristics of histologic subtypes. For example, in this study data, there were 11 cases of uterine LMS among a total of 57 cases of LMS. The response rate was 27.2%, with three patients showing PR responses. Moreover a total of 46 cases were classified as nonuterine LMS because their primary sites were locations such as the extremities, kidneys and abdominal retroperitoneum. Twelve of these patients showed PR results, corresponding to a 26.15% response rate. However, in this study, for nine of the 11 patients (81.8%) who were identified as having a uterine subtype, this was at least the third line of chemotherapy, whereas 30 patients (65%) with non-uterine LMS received this therapy as their second line of treatment. Taxane therapy can be selected as an off-label therapy for uterine sarcoma in Korea. Therefore, gemcitabine plus docetaxel therapy may have been administered more often for heavily treated uterine subtype than non-uterine subtypes. Because of this selection bias, it was difficult to compare the response rates between subgroups of LMS in this study. There were also some differences in administration and dosage depending on the protocols of each hospital, and detailed protocols such as administration of granulocyte colony-stimulating factor in the event of adverse reactions differed slightly from hospital to hospital. Despite these numerous limitations, this study is a large-scale national study of patients with soft tissue sarcoma, which is difficult to evaluate using prospective designs owing to its rare occurrence, and our results reflect the clinical efficacy of the gemcitabine and docetaxel regimen practiced in Korean hospitals. Thus, we believe that our study provides valuable clinical insights. In this study, in addition to the patient case reports, specific details submitted to the Korea HIRA for the examination of anticancer drug benefits from each hospital and follow-up evaluations of death dates were reviewed to improve the quality of data for response rate and survival periods. The results of this study will facilitate identification of the disease characteristics and selection of anticancer chemotherapy in clinical settings in Korea. In the future, more effective and individualized treatment approaches need to be explored for each histopathological subtype of soft tissue sarcoma.

The results of this nationwide retrospective analysis of 218 patients from 20 medical centers representing all cases of the use of gemcitabine and docetaxel combination therapy for treating patients with advanced soft tissue sarcoma in Korea showed that this combination treatment was effective and its toxicity was manageable. In conclusion, for patients with advanced soft tissue sarcoma, especially LMS, gemcitabine and docetaxel combination therapy could be an important therapeutic option.

NOTES

Conflict of interest relevant to this article was not reported.

Acknowledgements

The funding for this study was supported by the Health Insurance Review & Assessment, Wonju, Gangwon, Korea.

Fig. 1.

Kaplan-Meier estimates of progression-free survival (PFS) in patients treated with gemcitabine and docetaxel combination as a second or subsequent line treatment in Korea. CI, confidence interval.

Fig. 2.

Kaplan-Meier estimates of overall survival (OS) in patients treated with gemcitabine and docetaxel combination as a second or subsequent line treatment in Korea. CI, confidence interval.

Fig. 3.

Kaplan-Meier estimates of progression-free survival in patients treated with gemcitabine and docetaxel combination as a second or subsequent line treatment according to histology in Korea. LMS, leiomyosarcoma.

Table 1.

Baseline demographic and clinical characteristics of patients

Characteristic	No. (%)
Sex
Male	111 (50.9)
Female	107 (49.1)
Age, median (range, yr)	50 (18-77)
Histology
Leiomyosarcoma	57 (26.1)
Malignant fibrous histiocytoma	36 (16.5)
Liposarcoma	27 (12.4)
Synovial sarcoma	19 (8.7)
Malignantperipheral nerve sheath tumor	15 (6.9)
Fibrosarcoma	12 (5.5)
Epithelioid sarcoma	9 (4.1)
Angiosarcoma	8 (3.7)
Desmoplastic small round cell tumor	6 (2.8)
Malignant hemangiopericytoma	5 (2.3)
Alveolar soft part sarcoma	2 (0.9)
Neuroectodermal tumor	1 (0.5)
Sarcoma, not otherwise specified	21 (9.6)
Initial localization
Abdomen-retroperitoneum-pelvis	107 (49.1)
Extremity	50 (22.9)
Chest	37 (17.0)
Head and neck	10 (4.6)
Others	14 (6.4)
Previous treatment
Surgery	179 (82.1)
Adjuvant chemotherapy	56 (25.7)
Radiotherapy	110 (50.5)
Palliative chemotherapy	210 (96.3)
No. of previous chemotherapy lines
1	129 (59.2)
2	52 (23.9)
≥ 3	37 (17.0)
ECOG PS
0	34 (15.6)
1	145 (66.1)
2	27 (12.4)
3	5 (2.3)
Unknown	8 (3.7)

ECOG PS, Eastern Cooperative Oncology Group performance status.

Table 2.

Responses to gemcitabine and docetaxel combination treatment

Response	No. (%)
Complete response	1 (0.5)
Partial response	33 (15.1)
Stable disease	79 (36.2)
Progressive disease	83 (38.1)
Not evaluable	22 (10.1)
Objective response rate	34 (15.6)

Table 3.

Objective response rate by histology

Variable	Objective response rate (%)	No./Total
All histological subtypes	15.7	34/217
Leiomyosarcoma	26.3	15/57
Malignant fibrous histiocytoma	11.1	4/35
Liposarcoma	14.8	4/27
Synovial sarcoma	10.5	2/19
Malignant peripheral nerve sheath tumor	0	0/16
Fibrosarcoma	16.7	2/12
Epithelioid sarcoma	11.1	1/9
Angiosarcoma	37.5	3/8
Desmoplastic small round cell tumor	16.7	1/6
Malignant hemangiopericytoma	0	0/5
Alveolar soft part sarcoma	0	0/2
Neuroectodermal tumor	0	0/1
Sarcoma, not otherwise specified	9.5	2/21

Table 4.

Prognostic factors for progression-free survival: univariate analysis with Cox univariate models

	Hazard ratio (95% CI)	p-value
Performance status (0-1 vs. 2-3)	0.694 (0.452-1.066)	0.0954
No. of lines of previous systemic therapy (1 vs. ≥ 2)	0.888 (0.655-1.205)	0.4475
Sex (female vs. male)	1.247 (0.925-1.681)	0.1476
Age (≤ 50 yr vs. > 50 yr)	1.388 (1.027-1.875)	0.0326
Histology subtype (leiomyosarcoma vs. other sarcoma)	0.693 (0.493-0.975)	0.0352

CI, confidence interval.

Table 5.

Toxicity (% person)

Toxicity	G1	G2	G3	G4	Unknown grade
Hematological
Neutropenia	5 (2.3)	10 (4.5)	40 (18.3)	38 (17.4)	-
Anemia	33 (15.1)	60 (27.4)	32 (14.6)	1 (0.5)	-
Thrombocytopenia	22 (10.2)	16 (7.3)	20 (9.1)	5 (2.3)	-
Febrile neutropenia	2 (0.9)	-	11 (5.1)	8 (3.7)
Nonhematological
Nausea/Vomiting	23 (10.5)	13 (5.9)	3 (1.4)	-	21 (9.6)
Mucositis	22 (10.1)	8 (3.7)	1 (0.5)	-	1 (0.5)
Peripheral neuropathy	21 (9.6)	11 (5.0)	2 (0.9)	-	1 (0.5)
Fatigue	18 (8.2)	8 (3.7)	1 (0.5)	2 (0.9)	6 (2.7)
Diarrhea	12 (5.5)	6 (2.7)	2 (0.9)	-	3 (1.4)
Myalgia	19 (8.7)	6 (2.7)	1 (0.5)	1 (0.5)	4 (1.8)
Anorexia	15 (6.9)	6 (2.7)	-	-	1 (0.5)
Skin rash	8 (3.7)	4 (1.8)	2 (0.9)	-	-
General weakness	3 (1.4)	4 (1.9)	3 (1.4)	-	5 (2.3)
Abdominal pain	5 (2.3)	6 (2.7)	-	-	-
Dyspnea	3 (1.4)	5 (2.3)	-	-	1 (0.5)
Insomnia	2 (0.9)	1 (0.5)	-	-	2 (0.9)
Fever	11 (5.1)	2 (0.9)	-	-	1 (0.5)
Constipation	7 (3.2)	2 (0.9)	-	-	1 (0.5)
Alopecia	3 (1.4)	2 (0.9)	1 (0.5)	-	-

Values are presented as number (%).

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Gemcitabine and Docetaxel Combination for Advanced Soft Tissue Sarcoma: A Nationwide Retrospective Study

Cancer Res Treat. 2018;50(1):175-182. Published online March 30, 2017

DOI: https://doi.org/10.4143/crt.2016.535

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Abstract
Introduction
Materials and Methods
Results
Discussion
NOTES
REFERENCES

Gemcitabine and Docetaxel Combination for Advanced Soft Tissue Sarcoma: A Nationwide Retrospective Study

Fig. 1. Kaplan-Meier estimates of progression-free survival (PFS) in patients treated with gemcitabine and docetaxel combination as a second or subsequent line treatment in Korea. CI, confidence interval.

Fig. 2. Kaplan-Meier estimates of overall survival (OS) in patients treated with gemcitabine and docetaxel combination as a second or subsequent line treatment in Korea. CI, confidence interval.

Fig. 3. Kaplan-Meier estimates of progression-free survival in patients treated with gemcitabine and docetaxel combination as a second or subsequent line treatment according to histology in Korea. LMS, leiomyosarcoma.

Fig. 1.

Fig. 2.

Fig. 3.

Gemcitabine and Docetaxel Combination for Advanced Soft Tissue Sarcoma: A Nationwide Retrospective Study

Characteristic	No. (%)
Sex
Male	111 (50.9)
Female	107 (49.1)
Age, median (range, yr)	50 (18-77)
Histology
Leiomyosarcoma	57 (26.1)
Malignant fibrous histiocytoma	36 (16.5)
Liposarcoma	27 (12.4)
Synovial sarcoma	19 (8.7)
Malignantperipheral nerve sheath tumor	15 (6.9)
Fibrosarcoma	12 (5.5)
Epithelioid sarcoma	9 (4.1)
Angiosarcoma	8 (3.7)
Desmoplastic small round cell tumor	6 (2.8)
Malignant hemangiopericytoma	5 (2.3)
Alveolar soft part sarcoma	2 (0.9)
Neuroectodermal tumor	1 (0.5)
Sarcoma, not otherwise specified	21 (9.6)
Initial localization
Abdomen-retroperitoneum-pelvis	107 (49.1)
Extremity	50 (22.9)
Chest	37 (17.0)
Head and neck	10 (4.6)
Others	14 (6.4)
Previous treatment
Surgery	179 (82.1)
Adjuvant chemotherapy	56 (25.7)
Radiotherapy	110 (50.5)
Palliative chemotherapy	210 (96.3)
No. of previous chemotherapy lines
1	129 (59.2)
2	52 (23.9)
≥ 3	37 (17.0)
ECOG PS
0	34 (15.6)
1	145 (66.1)
2	27 (12.4)
3	5 (2.3)
Unknown	8 (3.7)

Response	No. (%)
Complete response	1 (0.5)
Partial response	33 (15.1)
Stable disease	79 (36.2)
Progressive disease	83 (38.1)
Not evaluable	22 (10.1)
Objective response rate	34 (15.6)

Variable	Objective response rate (%)	No./Total
All histological subtypes	15.7	34/217
Leiomyosarcoma	26.3	15/57
Malignant fibrous histiocytoma	11.1	4/35
Liposarcoma	14.8	4/27
Synovial sarcoma	10.5	2/19
Malignant peripheral nerve sheath tumor	0	0/16
Fibrosarcoma	16.7	2/12
Epithelioid sarcoma	11.1	1/9
Angiosarcoma	37.5	3/8
Desmoplastic small round cell tumor	16.7	1/6
Malignant hemangiopericytoma	0	0/5
Alveolar soft part sarcoma	0	0/2
Neuroectodermal tumor	0	0/1
Sarcoma, not otherwise specified	9.5	2/21

	Hazard ratio (95% CI)	p-value
Performance status (0-1 vs. 2-3)	0.694 (0.452-1.066)	0.0954
No. of lines of previous systemic therapy (1 vs. ≥ 2)	0.888 (0.655-1.205)	0.4475
Sex (female vs. male)	1.247 (0.925-1.681)	0.1476
Age (≤ 50 yr vs. > 50 yr)	1.388 (1.027-1.875)	0.0326
Histology subtype (leiomyosarcoma vs. other sarcoma)	0.693 (0.493-0.975)	0.0352

Toxicity	G1	G2	G3	G4	Unknown grade
Hematological
Neutropenia	5 (2.3)	10 (4.5)	40 (18.3)	38 (17.4)	-
Anemia	33 (15.1)	60 (27.4)	32 (14.6)	1 (0.5)	-
Thrombocytopenia	22 (10.2)	16 (7.3)	20 (9.1)	5 (2.3)	-
Febrile neutropenia	2 (0.9)	-	11 (5.1)	8 (3.7)
Nonhematological
Nausea/Vomiting	23 (10.5)	13 (5.9)	3 (1.4)	-	21 (9.6)
Mucositis	22 (10.1)	8 (3.7)	1 (0.5)	-	1 (0.5)
Peripheral neuropathy	21 (9.6)	11 (5.0)	2 (0.9)	-	1 (0.5)
Fatigue	18 (8.2)	8 (3.7)	1 (0.5)	2 (0.9)	6 (2.7)
Diarrhea	12 (5.5)	6 (2.7)	2 (0.9)	-	3 (1.4)
Myalgia	19 (8.7)	6 (2.7)	1 (0.5)	1 (0.5)	4 (1.8)
Anorexia	15 (6.9)	6 (2.7)	-	-	1 (0.5)
Skin rash	8 (3.7)	4 (1.8)	2 (0.9)	-	-
General weakness	3 (1.4)	4 (1.9)	3 (1.4)	-	5 (2.3)
Abdominal pain	5 (2.3)	6 (2.7)	-	-	-
Dyspnea	3 (1.4)	5 (2.3)	-	-	1 (0.5)
Insomnia	2 (0.9)	1 (0.5)	-	-	2 (0.9)
Fever	11 (5.1)	2 (0.9)	-	-	1 (0.5)
Constipation	7 (3.2)	2 (0.9)	-	-	1 (0.5)
Alopecia	3 (1.4)	2 (0.9)	1 (0.5)	-	-

Table 1. Baseline demographic and clinical characteristics of patients

ECOG PS, Eastern Cooperative Oncology Group performance status.

Table 2. Responses to gemcitabine and docetaxel combination treatment

Table 3. Objective response rate by histology

Table 4. Prognostic factors for progression-free survival: univariate analysis with Cox univariate models