Dendritic cell vaccine and cytokine-induced killer cell therapy for the treatment of advanced non-small cell lung cancer

  • Authors:
    • Lihong Zhang
    • Xuejing Yang
    • Zhen Sun
    • Jiali Li
    • Hui Zhu
    • Jing Li
    • Yan Pang
  • View Affiliations

  • Published online on: February 24, 2016     https://doi.org/10.3892/ol.2016.4273
  • Pages: 2605-2610
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Abstract

The present study aimed to evaluate the survival time, immune response and safety of a dendritic cell (DC) vaccine and cytokine-induced killer (CIK) cell therapy (DC-CIK) in advanced non-small cell lung cancer (NSCLC). The present retrospective study enrolled 507 patients with advanced NSCLC; 99 patients received DC-CIK [immunotherapy group (group I)] and 408 matched patients did not receive DC-CIK, and acted as the control [non-immunotherapy group (group NI)]. Delayed-type hypersensitivity (DTH), quality of life (QOL) and safety were analyzed in group I. The follow‑up period for the two groups was 489.2±160.4 days. The overall survival (OS) time was calculated using the Kaplan‑Meier method. DTH was observed in 59 out of 97 evaluated patients (60.8%) and 67 out of 98 evaluated patients (68.4%) possessed an improved QOL. Fever and a skin rash occurred in 36 out of 98 patients (36.7%) and 7 out of 98 patients (7.1%) in group I. DTH occurred more frequently in patients with squamous cell carcinoma compared with patients with adenocarcinoma (77.1 vs. 40.4%; P=0.0013). Radiotherapy was not associated with DC‑CIK‑induced DTH (72.7 vs. 79.6%; P=0.18), but chemotherapy significantly reduced the rate of DTH (18.2 vs. 79.6%; P=0.00). The OS time was significantly increased in group I compared with group NI (P=0.03). In conclusion, DC-CIK may induce an immune response against NSCLC, improve the QOL, and prolong the OS time of patients, without adverse effects. Therefore, the present study recommends DC-CIK for the treatment of patients with advanced NSCLC.

Introduction

Lung cancer is the leading cause of cancer-associated mortality and the most common cancer type worldwide (1). In total, ~80% of all lung cancer cases are non-small cell lung cancer (NSCLC) (2), for which surgery, chemotherapy and radiotherapy remain the standard treatments (3). The majority of patients with NSCLC are not recommended for surgery, since patients are often diagnosed at an advanced stage of disease (stage IIIb or IV). Patients that do undergo radical surgery may eventually develop locoregional recurrence or distant metastasis (4). Characterized by inexorable disease progression, advanced NSCLC usually has a high malignant potential. Its prognosis is poor and the clinical onset is extensive, despite treatment with chemotherapy and radiation (5). Systemic chemotherapy is the recommended first-line treatment for patients with advanced stage and metastatic NSCLC, but it is often considered ineffective or excessively toxic (6).

Multidisciplinary approaches are required to develop novel treatments for advanced NSCLC (7). One of these multidisciplinary approaches is immunotherapy (7,8), an important and effective method in cancer treatment, particularly for advanced-stage disease (9). Immune cells, including cytokine-induced killer (CIK) cells and dendritic cells (DCs), aid in mounting an effective immune response against cancer cells and kill cancer cells, including residual cells (1013). A combination of conventional methods, such as surgery, chemotherapy and radiotherapy, combined with immunotherapy is a novel approach to reducing mortality from cancer (3,14).

In the present study, the immune response induced by a DC vaccine and CIK cell therapy (DC-CIK), the adverse effects of the vaccine, and improvements in the quality of life (QOL) and overall survival (OS) time were evaluated in patients with advanced NSCLC.

Patients and methods

Patients and immunotherapy

All patients were enrolled at the Department of Oncology, Tianjin Union Medicine Centre (Tianjin, China). The present study evaluated two groups of patients, consisting of patients that received DC-CIK [immunotherapy group (group I)] and matched patients that did not receive DC-CIK [non-immunotherapy group (group NI)], who acted as the control. Group I consisted of hospitalized patients with NSCLC that underwent DC-CIK between January 2012 and October 2012, and who possessed stage IIIb or IV disease and locoregional recurrence or distant metastasis following surgery for NSCLC. The immunotherapy patients underwent blood tests and met the following requirements: Lymphyocytes and monocytes, >0.7×109/l; white blood cells, >3.0×109 cells/l; hemoglobin, >75.0 g/l; platelets, >50.0×109 platelets/l; coagulation: prothrombin time, <22.5 sec; activated partial thromboplastin time, <65 sec; thrombin time, <32 sec; cardiac function, ≤III level (15); liver function, <Child-Pugh Class/Score C (16); no renal failure or uremia. The requirements indicated adequate kidney, liver, coagulation and bone marrow function. Group NI consisted of NSCLC patients with matched characteristics and treatments to the patients in group I, but did not receive DC-CIK.

The present study was performed at the Department of Oncology of Tianjin Union Medicine Centre (Tianjin, China). Following the policy outlined by the Ministry of Health of China, the present study was approved as a class III medical technique, and was listed in Treatment with Autologous Immune Cells (T cells, NK cells) (17,18). All patients provided written informed consent prior to treatment, as required by the Ethics Committee of Tianjin Union Medicine Centre. The present study was a retrospective study using data obtained from the medical records of patients that received a standard treatment for NSCLC. The clinical data were collected with permission from the Inpatients Electronic Medical Records of Tianjin Union Medicine Centre.

Preparation of DCs and CIK cells

On the first day of treatment, leukocyte fractions were collected from the patients via leukapheresis using the Fresenius KABI System (COM.TEC; Fresenius SE & Co. KGaA, Homburg, Germany) under electrocardiographic monitoring. Peripheral blood mononuclear cells (PBMCs) were isolated via Ficoll-Hypaque gradient centrifugation and cultured for 2 h [DCs, RPMI-1640 (Gibco®; Thermo Fisher Scientific, Inc., Waltham, MA, USA); CIK, GT-T551 medium (Takara Bio, Inc., Beijing China)] in a Forma™ Series II 3111 CO2 Waterjacket Incubator (Thermo Fisher Scientific, Inc.). The human lung squamous cell carcinoma SK-MES-1 and human lung adenocarcinoma SPC-A-1 cell lines (Chinese Academy of Sciences, Shanghai, China) were cultured in Gibco Cell Culture Media (Thermo Fisher Scientific, Inc.) for 24 h at 37°C (1921). The cells were lysed by ultrasound and centrifuged (Heraeus Fresco 17; Thermo Fisher Scientific, Inc.) at 600 × g for 30 min. The supernatants were collected and used as a tumor lysate for DC preparation. DCs and CIK cells were prepared as described in a previous study (2224). The supernatants of cultured PBMCs were removed for the additional preparation of CIK cells and the remaining cells were cultured for 7 days in the presence of granulocyte-macrophage colony stimulating factor, interleukin (IL)-4 and tumor necrosis factor (PeproTech EC, Ltd., London, UK), and pulsed with the tumor lysate (PeproTech EC, Ltd.) (25). On the ninth day, the DCs were harvested for immediate vaccinations (12,26) or frozen for subsequent reinfusion. The supernatants were washed, and were cultured in the presence of interferon-γ, rat anti-human anti-cluster of differentiation 3 monoclonal antibody (catalog no., T210; dilution, 1:100; Takara Bio, Inc.) and IL-2 (PeproTech EC, Ltd.) (27). The cells were harvested between days 13 and 15.

Clinical regimen

The viability of DCs and CIK cells was >70 and 90%, respectively, detected using flow cytometry (FC500; Beckman Coulter, Miami, FL, USA). The cells were subjected to a bacterial gram stain, bacterial culture, fungal culture and bacterial endotoxin test to ensure they were not contaminated with bacteria, fungi or mycoplasma, and endotoxin levels in the cells were >5 EU/kg prior to infusion. On the ninth day, 1×107 vaccine DCs suspended in 100 ml normal saline (NS) were infused intravenously once a week for 3 weeks. Subsequently, 1.0×107 DCs suspended in 4 ml NS in 2 syringes were infused intradermally once a week for an additional 3 weeks. On the twelfth day, 1×109 CIK cells suspended in 100 ml NS were infused intravenously once a day for 4 consecutive days.

Immune response

In total, 1 week subsequent to the last DC vaccination, delayed-type hypersensitivity (DTH) of the patients was tested as an immune response marker. A total of 1×107 DCs in 0.1 ml NS was administrated intradermally into the forearm of each patient. The patients were asked to measure the diameter of the skin erythema around the injection point following 24, 48 and 72 h. The DTH reaction was defined as follows: >10 mm in diameter, strongly positive; 5–10 mm, positive; 2–5 mm, weakly positive; and <2 mm, negative (22,28).

QOL

The QOL of the patients was evaluated based on physical strength, appetite, amount of sleep and body weight (29). The patients were provided a clinical response questionnaire, on which they recorded feedback regarding the effect of the treatment. QOL score was determined by the number of improved factors, ranging between 0, indicating no improvement, and 4, indicating all factors improved.

Safety

Fever was the most common adverse effect of DC-CIK and was of considerable concern. Fever was defined as a cold-like symptom, with varying temperatures defining the severity of the fever, as follows: <38°C, Low fever; 38–39°C, moderate fever; and >39°C, high fever. Skin rashes were also observed during therapy.

Adverse effects

Adverse reactions, including insomnia, anorexia and joint soreness were monitored during DC-CIK. A slight increase in body temperature was regarded as a cold-like symptom. Fever, skin rashes and other symptoms previously observed during DC-CIK were recorded (22). Adverse effects known to be associated with chemotherapy and radiotherapy, such as nausea, vomiting, bone marrow suppression and organ function impairment, including the kidneys, liver, lungs and heart, were also monitored.

OS time

The OS time was calculated as the date from which the patients were enrolled in the present study to the date that the patient succumbed to NSCLC or any other cause. The OS time for the two groups was analyzed and compared using Kaplan-Meier estimates.

Data collection and statistical analysis

The primary end-points for the present study were the immune response and QOL of the patients, and the safety of the therapy. The secondary end-point was the OS time of the patients (30). Clinical data were collected using EpiData software version 3.02 (EpiData Association, Odense, Denmark). Statistical analyses were performed using SPSS software version 19.0 (IBM SPSS, Armonk, NY, USA). The Student's t-test was used for measurement data and the χ2 test was used for count data. The OS curves were calculated using the Kaplan-Meier method. P<0.05 was considered to indicate a statistically significant difference.

Results

Patient characteristics

A total of 507 patients with advanced NSCLC were enrolled in the present study, consisting of 311 male and 196 female patients, with a mean age of 66.28 years (range, 29–93 years). The tumor diagnoses of the patients were as follows: Squamous cell carcinoma, 219 patients; adenocarcinoma, 256 patients; and undefined, 32 patients. The degree of NSCLC differentiation was high in 36 patients, medium in 207 patients and low in 263 patients. Among the 507 patients, 44 (8.7%) underwent primary tumor resection, 96 (18.9%) received radiotherapy and 107 (21.1%) received chemotherapy within 3 months prior to the start of immunotherapy (Table I).

Table I.

Characteristics of patients with advanced non-small cell lung cancer.

Table I.

Characteristics of patients with advanced non-small cell lung cancer.

CharacteristicsGroup I, n (%)Group NI, n (%)Total, n (%)P-value
Total99 (100.0)408 (100.0)507 (100.0)
Age, years 0.39
  Range31–8729–9329–93
  Mean ± SD64.7±10.468.1±10.666.28±8.9
Gender 0.33
  Male65 (65.7)246 (60.3)311 (61.3)
  Female34 (34.3)162 (39.7)196 (38.7)
Degree of differentiationa 0.99
  High7 (7.1)  29 (7.1)36 (7.1)
  Middle40 (40.4)  167 (40.9)207 (40.8)
  Low52 (52.5)  211 (51.7)263 (51.9)
Tumor types
  Squamous cell carcinoma35 (35.4)184 (45.1)219 (43.2)0.21
  Adenocarcinoma57 (57.6)199 (48.7)256 (50.5)
  Undefined7 (7.1)25 (6.1)32 (6.3)
Combined therapies
  Surgery11 (11.1)33 (8.1)44 (8.7)0.34
  Radiotherapy25 (25.3)  71 (17.4)  96 (18.9)0.07
  Chemotherapy25 (25.3)  82 (20.1)107 (21.1)0.26

a One patient was classified with a middle-high degree of differentiation and was, therefore, excluded. Group I, immunotherapy group; Group NI, non-immunotherapy group; SD, standard deviation.

The 507 patients were divided into two groups. A total of 408 patients that received a routine treatment regimen consisting of surgery, radiotherapy and chemotherapy were enrolled into the non-immunotherapy group (control group; group NI). In addition, 99 patients that received DC-CIK in addition to the routine treatments were classified as the immunotherapy group (group I). The characteristics of the patients, including age, gender, diagnostic methods and tumor type, were similar between the two groups. With the exception of the use of DC-CIK, the treatment strategies did not differ significantly between the two groups (Table I).

DTH skin test

The DTH skin test results were available for 97 out of the 99 patients in group I, of whom 59 (60.8%) possessed a positive result. In total, 10 of these patients (10.3%) had a strongly positive result; 25 (25.8%) had a positive result; 24 (24.7%) had a weakly positive result; and 38 (39.2%) had a negative result (Table II). The results from 2 patients were unknown.

Table II.

Grade of DTH, fever, allergy and QOL in patients with advanced non-small cell lung cancer treated with dendritic cell vaccine and cytokine-induced killer cell therapy.

Table II.

Grade of DTH, fever, allergy and QOL in patients with advanced non-small cell lung cancer treated with dendritic cell vaccine and cytokine-induced killer cell therapy.

Response gradeDTH, n (%)Fever, n (%)Allergy, n (%)QOL, n (%)
Total97 (98.0)98 (99.0)98 (99.0)98 (99.0)
Data loss2 (2.0)1 (1.0)1 (1.0)1 (1.0)
Grade
  038 (39.2)62 (63.3)91 (92.9)31 (31.6)
  124 (24.7)14 (14.3)5 (5.1)26 (26.5)
  225 (25.8)16 (16.3)2 (2.0)34 (34.7)
  310 (10.3)6 (6.1)7 (7.1)

[i] The DTH grade was characterized as: 0, <2 mm; 1, 2–5 mm; 2, 5–10 mm; and 3, >10 mm. The fever grade was characterized as: 0, normal; 1, common cold-like symptoms and temperature <38°C; 2, 38–39°C; and 3, >39°C. The allergy grade was characterized as: 0, normal; 1, local erythema around injection point; and 2, systemic skin rash. The QOL was graded as: 0, no improvement; and 1–3, improvement in 1, 2–3 or 4 of the QOL factors, respectively. DTH, delayed-type hypersensitivity; QOL, quality of life.

QOL

The 4 QOL factors assessed were physical strength, appetite, amount of sleep and body weight. QOL scores were available for 98 out of the 99 patients in group I, as follows: 7 patients (7.1%) demonstrated improvements in all 4 QOL factors; 34 patients (34.7%) demonstrated improvements in 2–3 factors; and 26 patients (26.5%) demonstrated improvements in a single factor. Overall, 68.4% of the group I patients (67 out of 98) possessed an improved QOL following immunotherapy, while the remaining 31.6% of patients (31 out of 98) had no improvement in QOL (Table II).

Adverse effects

Body temperature was recorded in 98 out of the 99 patients in group I. In these 98 patients, cold-like symptoms with a low fever were observed in 14 patients (14.3%). A moderate fever was observed in 16 patients (16.3%) and a high fever was observed in 6 patients (6.1%). In total, 36 of the 98 patients (36.7%) experienced fever, including cold-like symptoms. No fever was detected in the remaining 62 patients (63.3%) during DC-CIK (Table II). The presence or absence of allergy was recorded in 7 of the 98 patients in group I, 2 of whom experienced a skin rash (2.0%) and 5 of whom experienced local erythema around the injection site. No additional toxicities were observed in patients receiving DC-CIK (Table II) (31).

Association between DTH and tumor type

In group I, 27 of the 35 patients (77.1%) with squamous cell carcinoma of the lung developed DTH. By contrast, 23 of the 57 patients (40.4%) with adenocarcinoma of the lung developed DTH (P=0.0013; Table IV).

Table IV.

Association between DTH and tumor type in patients with advanced non-small cell lung cancer that underwent dendritic cell vaccine and cytokine-induced killer cell therapy therapy.

Table IV.

Association between DTH and tumor type in patients with advanced non-small cell lung cancer that underwent dendritic cell vaccine and cytokine-induced killer cell therapy therapy.

Tumor typesTotal, nDTH+, nDTH, nIncidence of DTH, %P-value
Total, n92  504254.3
Squamous cell carcinoma35  27  877.10.0013
Adenocarcinoma57  233440.4

[i] DTH, delayed-type hypersensitivity; DC-CIK, dendritic cell vaccine and cytokine-induced killer cell therapy.

Effect of radiotherapy and chemotherapy on DTH

The association between radiotherapy, chemotherapy and DTH was assessed in 93 out of the 96 patients with NSCLC in group I. The remaining 3 patients received radiotherapy and chemotherapy concurrently and were excluded from the analysis.

There was no significant difference between the rate of DTH in the 49 patients in group I that did not undergo radiotherapy (79.6%) compared with the 22 patients that did (72.7%). However, the incidence of DTH was significantly lower amongst the patients that underwent chemotherapy (18.2%) compared with those patients that did not (79.6%; P=0.22; Table III).

Table III.

Effect of radiotherapy and chemotherapy on DTH in patients with advanced non-small cell lung cancer that underwent DC-CIK.

Table III.

Effect of radiotherapy and chemotherapy on DTH in patients with advanced non-small cell lung cancer that underwent DC-CIK.

GroupsTotal, nDTH+, nDTH, nIncidence of DTH, %P-value
Total, n93573661.3
Radiotherapy + DC-CIK2216  672.70.213
Chemotherapy + DC-CIK22  41818.20.001
DC-CIK49391079.6

[i] In total, 3 patients were excluded from the analysis since they received radiotherapy and chemotherapy concurrently. P-value vs. dendritic cell vaccine and cytokine-induced killer cell therapy. DTH, delayed-type hypersensitivity; DC-CIK, dendritic cell vaccine and cytokine-induced killer cell therapy.

OS time

The OS time of patients in group I was estimated and compared to the OS time of patients in group NI using the Kaplan-Meier method. In total, 20 out of 99 patients (20.2%) in group I and 125 out of 408 patients (30.6%) in group NI succumbed to NSCLC or other causes during the present study. The OS time of patients in group I was significantly improved compared with group NI (P=0.03; Fig. 1) (32).

Discussion

Despite rapid advances in surgery, radiotherapy and chemotherapy, which are effective modalities in cancer treatment, the prognosis following treatment for NSCLC remains poor (33). To improve the clinical outcome for patients with NSCLC, novel treatment modalities are urgently required. One such alternative is immunotherapy with DC-CIK, where DCs have previously been revealed to activate CIK cells, which enhances antitumor effects in NSCLC patients (34,35). An adoptive transfer of CIK cells with DCs has proven to be an effective strategy for extending the OS time in patients (7,36), enhancing host cellular immune responses and improving the QOL of patients (8,37). Furthermore, no severe adverse effects were reported during DC-CIK cell transfusion, indicating that this therapy is safe for clinical use. Adverse effects were mild and were effectively managed.

The present study used the DTH skin test to assess the cell-mediated cytotoxicity response induced by DC-CIK, and identified that 61% of DC-CIK-treated patients (59 out of 97) had a positive reaction. In addition, 68% of patients (67 out of 98) demonstrated improved physical strength, appetite, sleep and body weight. No toxicity other than fever and skin rash was associated with DC-CIK. Fever was observed in 26 of the 98 patients (27%) in group I and was generally mild and temporary. During these episodes, body temperature was rarely >39°C and was relieved by cooling or antipyretic analgesics. Cold-like symptoms, regarded as a mild form of fever, were observed in 14 out of the 98 patients (14%). In these cases, patients complained of symptoms, including fatigue and sore joints, but their temperatures were normal (36–37°C). Allergic reactions, indicated by a skin rash, were rare, occurring in only 7 out of the 98 patients (7.1%), and usually mild and self-resolving without requiring special treatments (Table II). The rate of DTH in patient with squamous cell carcinoma of the lung was significantly higher compared with patients with adenocarcinoma of the lung (77.1 vs. 40.4%; P=0.0013; Table IV). Radiotherapy had no effect on DTH induced by DC-CIK (72.7 vs. 79.6%; P=0.02), but chemotherapy significantly reduced the incidence of DTH (18.2 vs. 79.6%; P=0.001; Table III).

The OS time of group I patients was estimated and compared to the OS time of group NI patients using the Kaplan-Meier method. In total, 20 out of the 99 patients in group I, and 125 out of the 408 patients in group NI succumbed to NSCLC or other causes during the present study. The improvement in the OS time of patients in group I was significant (P=0.03; Fig. 1) (11).

The present findings suggest that immunotherapy with DC-CIK has antitumor effects and, in combination with conventional treatment therapies, may prolong the OS time of advanced NSCLC patients (32,34).

Severe treatment-associated adverse effects and inadequate outcomes associated with conventional treatments may account for the poor prognosis of patients with advanced NSCLC. The present study revealed that there were no severe adverse effects resulting from DC-CIK therapy. Furthermore, this therapy mounted an immune response against NSCLC, and consequently lengthened the OS time and improved the QOL of patients (35). The present study concludes that DC-CIK may be beneficial for patients with advanced NSCLC.

Acknowledgements

The present study was partially supported by the Tianjin Municipal Science and Technology Commission (grant no., 12ZCDZSY17100).

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April-2016
Volume 11 Issue 4

Print ISSN: 1792-1074
Online ISSN:1792-1082

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Spandidos Publications style
Zhang L, Yang X, Sun Z, Li J, Zhu H, Li J and Pang Y: Dendritic cell vaccine and cytokine-induced killer cell therapy for the treatment of advanced non-small cell lung cancer. Oncol Lett 11: 2605-2610, 2016
APA
Zhang, L., Yang, X., Sun, Z., Li, J., Zhu, H., Li, J., & Pang, Y. (2016). Dendritic cell vaccine and cytokine-induced killer cell therapy for the treatment of advanced non-small cell lung cancer. Oncology Letters, 11, 2605-2610. https://doi.org/10.3892/ol.2016.4273
MLA
Zhang, L., Yang, X., Sun, Z., Li, J., Zhu, H., Li, J., Pang, Y."Dendritic cell vaccine and cytokine-induced killer cell therapy for the treatment of advanced non-small cell lung cancer". Oncology Letters 11.4 (2016): 2605-2610.
Chicago
Zhang, L., Yang, X., Sun, Z., Li, J., Zhu, H., Li, J., Pang, Y."Dendritic cell vaccine and cytokine-induced killer cell therapy for the treatment of advanced non-small cell lung cancer". Oncology Letters 11, no. 4 (2016): 2605-2610. https://doi.org/10.3892/ol.2016.4273