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Zhang B.,Dalian Medical University | Zhang X.,Dalian Medical University | Tang B.,Shandong Cancer Hospital | Zheng P.,Guilin Medical College | And 2 more authors.
Breast Cancer Research and Treatment | Year: 2012

Endocrine therapy is an important therapeutic approach for the treatment of oestrogen receptor (ER)- positive breast cancer. However, a number of these endocrine therapies can fail when the tumour loses its ER expression during treatment. To date, few studies have explored the potential clinical significance of traditional Chinese medicine in inducing the reversal of resistance to endocrine therapy in breast cancers. We used the ERαnegative MCF7 breast cancer cell line to create a tamoxifen (TAM)-resistant cell line, MCF7/TAM cells. After treating MCF7/TAM cells with ELE to induce the re-expression of ERα, we investigated the role and molecular mechanisms by which elemene (ELE) promotes the reversal of resistance to endocrine therapy. We discovered that treatment with 10 lg/ml ELE restored the sensitivity of MCF7/TAM cells to TAM. RT-PCR analysis revealed that ELE treatment upregulated ERα mRNA levels in MCF7/TAM cells, and immunohistochemistry confirmed the upregulation of ERα expression. Western blot analysis revealed that ELE treatment decreased the protein expression levels of Ras, MEK1/2 and p-ERK1/2 in MCF7/TAM cells. The loss of ERα expression was the primary reason for TAM resistance in MCF7 cells. The ELE-induced reversal of TAM resistance was mediated by the upregulation of ERα mRNA and the re-expression of ERα through the MAPK pathway. © Springer Science+Business Media New York 2012. Source

Hanna R.K.,University of North Carolina at Chapel Hill | Zhou C.,University of North Carolina at Chapel Hill | Malloy K.M.,University of North Carolina at Chapel Hill | Sun L.,Shandong Cancer Hospital | And 3 more authors.
Gynecologic Oncology | Year: 2012

Objectives: To examine the effects of combination therapy with metformin and paclitaxel in endometrial cancer cell lines. Methods: ECC-1 and Ishikawa endometrial cancer cell lines were used. Cell proliferation was assessed after exposure to paclitaxel and metformin. Cell cycle progression was assessed by flow cytometry. hTERT expression was determined by real-time RT-PCR. Western immunoblotting was performed to determine the effect of metformin/paclitaxel on the mTOR pathway. Results: Paclitaxel inhibited proliferation in a dose-dependent manner in both cell lines with IC 50 values of 1-5 nM and 5-10 nM for Ishikawa and ECC-1 cells, respectively. Simultaneous exposure of cells to various doses of paclitaxel in combination with metformin (0.5 mM) resulted in a significant synergistic anti-proliferative effect in both cell lines (Combination Index < 1). Metformin induced G1 arrest in both cell lines. Paclitaxel alone or in combination with metformin resulted in predominantly G2 arrest. Metformin decreased hTERT mRNA expression while paclitaxel alone had no effect on telomerase activity. Metformin stimulated AMPK phosphorylation and decreased phosphorylation of the S6 protein. In contrast, paclitaxel inhibited AMPK phosphorylation in the ECC-1 cell line and induced phosphorylation of S6 in both cell lines. Treatment with metformin and paclitaxel resulted in decreased phosphorylation of S6 in both cell lines but only had an additive effect on AMPK phosphorylation in the ECC-1 cell line. Conclusions: Metformin potentiates the effects of paclitaxel in endometrial cancer cells through inhibition of cell proliferation and modulation of the mTOR pathway. This combination may be a promising targeted therapy for endometrial cancer. © 2011 Elsevier Inc. All rights reserved. Source

Li S.,General Hospital of Lanzhou | Sun Y.,Shandong Cancer Hospital | Sun Y.,Shandong University | Gao D.,General Hospital of Lanzhou
Oncology Letters | Year: 2013

The notion that tumors lack innervation was proposed several years ago. However, nerve fibers are irregulatedly found in some tumor tissues. Their terminals interaction with cancer cells are considered to be neuro-neoplastic synapses. Moreover, neural-related factors, which are important players in the development and activity of the nervous system, have been found in cancer cells. Thus, they establish a direct connection between the nervous system and tumor cells. They modulate the process of metastasis, including degradation of base membranes, cancer cell invasion, migration, extravasation and colonization. Peripheral nerve invasion provides another pathway for the spread of cancer cells when blood and lymphatic metastases are absent, which is based on the interactions between the microenvironments of nerve fibers and tumor cells. The nervous system also modulates angiogenesis, the tumor microenvironment, bone marrow, immune functions and inflammatory pathways to influence metastases. Denervation of the tumor has been reported to enhance cancer metastasis. Stress, social isolation and other emotional factors may increase distant metastasis through releasing hormones from the brain, the hypothalamic-pituitary-adrenal axis and autonomic nervous system. Disruption of circadian rhythms will also promote cancer metastasis through direct and indirect actions of the nervous system. Therefore, the nervous system plays an important role in cancer metastasis. Source

Jiang X.-D.,Lianyungang First Peoples Hospital | Dai P.,Lianyungang First Peoples Hospital | Wu J.,Lianyungang First Peoples Hospital | Song D.-A.,Lianyungang First Peoples Hospital | Yu J.-M.,Shandong Cancer Hospital
International Journal of Radiation Oncology Biology Physics | Year: 2012

Purpose: To observe the effects of recombinant human endostatin (RHES) on the radiosensitivity of non-small cell lung cancer (NSCLC). Methods and Materials: First, 10 hypoxia-positive cases of pathology-diagnosed NSCLC selected from 15 patients were used to determine the normalization window, a period during which RHES improves NSCLC hypoxia. Second, 50 hypoxia-positive cases of pathology-diagnosed NSCLC (Stages I-III) were randomly divided into a RHES plus radiotherapy group (25 cases) and a radiotherapy-alone group (25 cases). Intensity = modulated radiotherapy with a total dose of 60 Gy in 30 fractions for 6 weeks was adopted in the two groups. The target area included primary foci and metastatic lymph nodes. In the RHES plus radiotherapy group, RHES (15 mg/day) was intravenously given during the normalization window. Results: After RHES administration, the tumor-to=normal tissue radioactivity ratio and capillary permeability surface were first decreased and then increased, with their lowest points on the fifth day compared with the first day (all p < 0.01). Blood flow was first increased and then decreased, with the highest point on the fifth day, compared with the first and tenth day (all p < 0.01). In the RHES plus radiotherapy group and the radiotherapy-alone group, the total effective rates (complete response plus partial response) were 80% and 44% (p = 0.009), respectively. The median survival times were 21.1 ± 0.97 months and 16.5 ± 0.95 months (p = 0.004), respectively. The 1-year and 2-year local control rates were 78.9 ± 8.4% and 68.1 ± 7.8% (p = 0.027) and 63.6 ± 7.2% and 43.4 ± 5.7% (p = 0.022), respectively. The 1-year and 2-year overall survival rates were 83.3 ± 7.2% and 76.6 ± 9.3% (p = 0.247) and 46.3 ± 2.4% and 37.6 ± 9.1% (p = 0.218), respectively. Conclusion: The RHES normalization window is within about 1 week after administration. RHES combined with radiotherapy within the normalization window has better short-term therapeutic effects and local control rates and no severe adverse reactions in the treatment of NSCLC, but it failed to significantly improve the 1-year and 3-year overall survival rates. © 2012 Elsevier Inc. Source

Xu H.R.,Shandong Cancer Hospital
Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery | Year: 2013

The application of extralevator abdomino-perineal excision (ELAPE) and total mesorectal excision has improved the prognosis of rectal cancer. However, compared with anterior resection for rectal cancer, the circumferential resection margin (CRM) positive rate and intraoperative perforation (IOP) rate are still high. The ELAPE can reduce the CRM positive rate and IOP rate, therefore reduce postoperative local recurrence rate and increase the survival rate of patients. The disadvantage of its trauma, longer operative time, and higher perineum complication in ELAPE is controversial. This review mainly discusses the key points of operative procedure, advantages and disadvantages, research status and development prospects of ELAPE. Source

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