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Prognostic Value of Pretreatment Albumin-to-Alkaline Phosphatase Ratio in Extensive-Disease Small-Cell Lung Cancer: A Retrospective Cohort Study
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To evaluate the effect of X-ray irradiation on apoptosis and change of expression of aquaporin 5 (AQP5) and transforming growth factor-β(TGF-β) in the rat submandibular gland (SMG).
SMGs of 120 male Sprague-Dawley rats were irradiated with a single X-ray dose (3, 10, 20, or 30 Gy). At the early and late post-irradiation phase, apoptosis was measured by the terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling (TUNEL) method, and expression of AQP5 and TGF-β was determined by immunohistochemical staining.
At the late post-irradiation phase, increased apoptosis was evident and marked decreases of expression of AQP5 expression by acinar cells and TGF-β expression by ductal cells were evident.
Apoptosis after X-ray irradiation develops relatively late in rat SMG. Irradiation reduces AQP5 and TGF-β expression in different SMG cell types.
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We tried to investigate the outcome and patterns of failure of endometrial cancer patients who were treated with surgery and postoperative radiation therapy (RT).
Eighty-three patients with endometrial cancer who received postoperative RT between May 1979 and August 2000 were included in this retrospective study. Forty-one patients received total abdominal hysterectomy, 41 patients received Wertheim's operation and 1 underwent vaginal hysterectomy. Pelvic lymph node dissection or pelvic lymph node sampling was done in 56 patients and peritoneal cytology was done in 35. All the patients were staged according to 1988 FIGO (International Federation of Gynecology and Obstetrics) staging system; 2 were stage IA, 23 were stage IB, 20 were stage IC, 4 were stage IIA, 5 were stage IIB, 9 were stage IIIA, 2 were stage IIIB and 18 were stage IIIC. The histologic diagnoses were adenocarcinoma in seventy-four patients (89%). The histologic grades were Grade 1, 2 and 3 in 21 (25%), 43 (52%) and 10 (12%) patients, respectively. All the patients received external beam RT (EBRT) with a median dose of 5,040 cGy (range: 4,500~5,075 cGy) to the whole pelvis. Five patients with pathologically confirmed paraaortic lymph node metastasis received 4500 cGy to the paraaortic lymph nodes. Fifteen patients received low-dose intracavitary brachytherapy after their EBRT. A total dose of 7,500~9,540 cGy (median dose: 8511) was prescribed to the vaginal surface.
Overall, 11 patients (13%) experienced disease relapse: 4 with initial stage I or II disease and 7 with initial stage III disease. Among the 54 stage I or II patients, 1 (2%) relapsed in the pelvis only, 2 (4%) relapsed in the vagina and distant organs, and 1 (2%) relapsed in the paraaortic lymph nodes (PANs). Among the 29 stage III patients, 1 (3%) relapsed in the vagina. The most common sites of failure for the stage III patients were the peritoneum (3 patients, 10%), PANs (2 patients, 7%), and lung (2 patients, 7%). With a median follow-up period of 86 months, the overall survival (OS) and disease-free survival (DFS) rates at 5 years were 87% for both. The five-year DFS rate was 93%, 100% and 74% for the stage I, II and III patients, respectively. Three patients experienced severe radiation-related late complications: RTOG (Radiation Therapy Oncology Group) grade 3 radiation cystitis was seen in one patient, and grade 3 bowel obstruction was seen in two patients.
Postoperative RT was useful for controlling pelvic disease. The major patterns of failure for stage III patients were peritoneal seeding and distant metastasis. Selective use of whole abdominal radiotherapy or adjuvant chemotherapy may improve the therapeutic outcome of these patients.
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To determine the effects of combinations of radiation and flavopiridol, an inhibitor of cyclin-dependent kinases and global transcription, in a human uterine cervix cancer cell line.
Human uterine cervix cancer cells (HeLa), cultured to the mid-log phase, were exposed to X-rays, flavopiridol, and combinations of X-rays and flavopiridol in various sequences. The end point in this study was the clonogenic survival, which was measured via clonogenic assays. In order to determine the intrinsic cytotoxicity of flavopiridol, 0, 5, 12.5, 25, 37.5, 50 and 100 nM of flavopiridol were added to cell culture media. In the combination treatment, four different schedules of flavopiridol and irradiation combinations were tested: treatment of flavopiridol for 24 hours followed by irradiation, simultaneous administration of flavopiridol and irradiation, and irradiation followed by flavopiridol (for 24 hours) at intervals of 6 and 24 hours. The fraction of cells surviving after the combination treatment with 2 Gy of radiation (SF2) was compared with that of the fraction of cells surviving after treatment with irradiation alone.
The cytotoxicity of flavopiridol was found to be dose-dependent, with an IC50 of 80 nM. No cytotoxic enhancements were observed when flavopiridol and radiation were administered simultaneously. Flavopiridol, administered either 24 hours before or 6 hours after irradiation, exerted no sensitizing effects on the cells. Only one protocol resulted in a radiosensitizing effect: the administration of flavopiridol 24 hours after irradiation.
Flavopiridol enhanced the effects of radiation on a uterine cervix cancer cell line
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There has been no definitive randomized study to identify the optimal therapeutic regimen for treating squamous cell carcinoma of tonsil. The purpose of this study was to retrospectively evaluate the treatment outcome according to various combinations of surgery, radiation therapy and chemotherapy.
Fifty-six patients with tonsillar carcinoma, who were treated at Seoul National University Hospital from March 1985 to August 2001, were the subjects of this study. Twenty-one patients received surgery followed by radiation therapy (SRT), 16 patients underwent radiation therapy alone (RT), and 19 patients received neoadjuvant chemotherapy and radiation therapy (CRT). The median radiation dose was 66.6 Gy for the SRT group and 70.2 Gy for the RT and CRT groups. Surgery comprised extended tonsillectomy and modified radical neck dissection of the involved neck. Cisplatin and 5-fluorouracil were used every three weeks for 3 cycles in the SRT group. The median follow-up was 73.2 months.
The distribution of T-stage was 4 cases of T1, 14 cases of T2, 1 case of T3 and 2 cases of T4 staging in the SRT group, 2 cases of T1, 6 cases of T2, 5 cases of T3 and 3 cases of T4 staging in the RT group and 0 cases of T1, 7 cases of T2, 9 cases of T3 and 3 cases of T4 staging in the CRT group. The distribution of N-stage was 5 cases of N0, 2 cases of N1, 13 cases of N2 and 1 case of N3 staging in the SRT group, 6 cases of N0, 5 cases of N1, 5 cases of N2 and 0 cases of N3 staging in the RT group, and 2 cases of N0, and 7 cases of N1, 9 cases of N2 and 1 case of N3 staging in the CRT group. The five-year overall survival rate (OSR) for all patients was 78%. The five-year OSR was 80% for the SRT group, 71% for the RT group, and 80% for the CRT group (p=ns). The five-year disease-free survival rate was 93% for the CRT group and 71% for the RT group (p=0.017). Four patients developed local failure and one patient failed at a regional site in the RT group, and one patient failed at a primary site in the CRT group. The five-year DFS was 84% for patients who had undergone neck dissection and 76% for patients who had not undergone neck dissection (p=ns). Treatment-related complications of grade 3 or 4 occurred in 15 patients, and the incidence of complication was not different between each of the treatment methods.
Although the patients with more advanced T stage were included in the RT and CRT groups, the OSR was not statistically different according to the treatment methods. In the radical radiation therapy group, the addition of neoadjuvant chemotherapy showed an improvement in the disease-free survival. Because of the retrospective nature of our study and the small number of patients, this study cannot draw any definite conclusions, but it suggests that radiation therapy with chemotherapy can be a good alternative option for squamous cell carcinoma of tonsil. Controlled randomized study is necessary to confirm this hypothesis.
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Histone deacetylase inhibitors (HDIs) are emerging as potentially useful components in anticancer therapy. In this study, we tried to confirm the radiosensitizing effect of trichostatin A (TSA) on a panel of human carcinoma cell lines and elucidate its mechanism of interaction.
A549, HeLa and Caski cells were exposed to TSA for 18 hr prior to irradiation, and the cell survival then measured using a clonogenic assay. Western blot and flow cytometric analyses, for histone acetylation, and cell cycle and apoptosis, respectively, were also performed.
TSA increased the acetylation of histone H3. The pretreatment of TSA consistently radiosensitized all three cell lines. The SF2 (surviving fraction at 2 Gy) of TSA-treated cells was significantly lower than that of mock treated cells. The SER (sensitizer enhancement ratio) increased in all 3 cell lines, in concentration dependent manners. The TSA treated cells showed abrogation of radiation-induced G2/M arrest, in a concentration dependent manner.
The pretreatment of TSA enhanced the radiosensitivity of a panel of human carcinoma cells, which was attributed, in part, to the abrogation of radiation-induced G2/M arrest.
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To evaluate the relationship between treatment failure and COX-2 expression in nasopharyngeal cancer patients treated with chemotherapy and radiotherapy.
The subjects of this study were 22 nasopharyngeal cancer patients. The patients were treated with neoadjuvant chemotherapy, followed by radiotherapy, or with radiotherapy alone. The formalin-fixed, paraffin-embedded tissues of 11 patients who developed a locoregional recurrence (n=7) or distant metastasis (n=4) were compared with those of 11 disease free patients. Prognostic factors, including histological type, stage, radiation dose and chemotherapy, were well balanced between the two groups. The COX-2 expression was determined immunohistochemically.
COX-2 expression was stronger in the patients with a locoregional recurrence or distant metastasis than in those free of disease. The COX-2 distribution scores of the control group were as follows: 0 in 7, 1 in 2 and 2 in 2 patients. In the recurrence group, the scores were as follows; 0 in 3, 1 in 1, 2 in 2 and 3 in 5 patients. COX-2 expression was shown to have a statistically significant influence on the treatment failure by the Mann-Whitney U test (p=0.024) and Mantel-Haenszel Chi-Square test (p=0.018). It also significantly influenced the treatment failure when an analysis was performed within patients with a undifferentiated histology (p=0.039 by the Mann-Whitney U test, p=0.037 by the Mantel-Haenszel Chi-Square test).
COX-2 expression is believed to be one of the important factors associated with a locoregional recurrence or distant metastasis.
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