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  • 1
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2813
    Keywords: clonogenic assay ; hyperthermia ; anticancer agents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Utilizing a clonogenic assay, the effects of hyperthermia and selected chemotherapeutic drugs on growth of cells from malignant effusions were studied. Fourteen of 25 samples obtained from 25 patients with various carcinomas formed at least 30 colonies per plate. Exposure of the cells to heat at 42°C for 1 hr before the plating slightly inhibited the colony growth. The drugs, adriamycin (AM) and mitomycin C (MMC), were tested at 3 different concentrations. When the cells were treated with these two drugs for 1 hr at 42°C, the percent of surviving colonies was significantly decreased, as compared to findings at 37°C, in both groups, at 3 different concentrations. The combination of drugs and hyperthermia appeared to function synergistically in one-third of such cases. These results suggest that cells from malignant effusions in patients with various carcinomas were more sensitive to AM or MMC, under condition of a higher temperature (42°C).
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-2813
    Keywords: cell-mediated cytotoxicity ; regional lymph nodes ; gastric carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cell-mediated cytotoxic activities of cells from the perigastric lymph nodes (LNC) were assayed in patients with gastric carcinoma. These activities were compared with those of the peripheral blood mononuclear cells (PBM), and also with the LNC of patients with benign lesions. The capacity of LNC to be converted to cytotoxic cells in mixed cell culture was significantly impaired in the cancer patients as compared to that of either the PBM from the same patients, or the LNC from patients with benign lesions. The natural killer cell (NK) activity of LNC was significantly lower than that of the PBM in both groups of patients. The cytotoxic activity induced by phytohemagglutinin activation (PAK) in the LNC from patients with carcinoma, as well as from those with benign lesions was also significantly decreased, when compared to that of the PBM, although the ability of LNC to produce interleukin 2 (IL 2) was significantly increased. The ability of these cells to generate cytotoxicity after activation with IL 2 (LAK) was therefore examined, and a decreased capacity in LNC was observed. These results indicated that the ability of T cells in LNC to develop into cytotoxic cells in patients with gastric carcinoma was impaired, and that the nonspecific cytotoxicity, including NK or PAK, as well as LAK activity, was essentially low in the perigastric lymph nodes.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1436-2813
    Keywords: gastric carcinoma ; chemo-immunotherapy ; survival rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Eighty-nine patients with advanced gastric carcinoma were treated with a combination chemo-immunotherapy regimen that consisted of active immunotherapy with Vibrio cholerae neuraminidase (VCN) treated autologous tumor cells admixed with BCG and drugs including cyclophosphamide, mitomycin C (MMC) and 5-fluorouracil, followed by long term tegafur (FT) and immunomodulators. This treatment significantly improved survival rate of patients in Stages III, IV and unresectable or recurrent carcinoma, compared to that of historical controls. As compared to controls treated with MMC followed by long term FT and immunodulators concurrently, survival rate of those in Stage III tended to improve (p〈0.1) and survival rate at 4.5 years in Stage III was significantly higher (p〈0.01), although it was not improved in Stage IV. In patients with unresectable or recurrent tumor, survival time was not significantly lengthened with this therapy when compared with that in patients given BCG alone in the same treatment schedule (CCI-BCG group). However, none of 19 patients in CCI-BCG group survived more than 15 months, although 4 of 28 patients receiving this therapy survived. These results suggest that this combination chemo-immunotherapy is effective for a selected group of patients with advanced gastric carcinoma.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1436-2813
    Keywords: tritiated thymidine incorporation ; soft agar culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We designed a simple method forin vitro chemosensitivity testing of tritiated thymidine incorporation by cells from tumor tissue plated in soft agar. Cells from tumor tissue were cultured in a plastic dish, of which a Millipore membrane had been sealed to the underside, containing two layers of agar. After labeling the cells with tritiated thymidine, the dishes were placed in a boiling water bath to solubilize the agar. The labeled cells could be readily collected on the membrane by evacuating the solubilized medium through membrane filters sealed underside of the dish. Using this system, 11 (55 per cent) of 20 tumor specimens from 20 patients with various carcinomas showed an incorporation of over 200 dpm above background and 80 per cent or greater inhibition of thymidine uptake by sodium azide treatment. This method offered several advantages over the thymidine incorporation assay, including technical simplicity and a shorter time course.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1436-2813
    Keywords: interleukin 2 ; surgical stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The capacity of peripheral blood mononuclear cells to produce interleukin 2 (IL 2) was studied serially before and after various surgical procedures in 34 patients. In the group of 6 patients who had minor surgery and were categorized into class 1, IL 2 activity did not differ significantly from the preoperative value, throughout the postoperative course. In the group of 14 class 2 patients who underwent major surgery, however, significant decreases in IL 2 activity were observed 1, 3 and 6 days after operation as compared to findings before surgery. Preoperative levels were reverted to by the 8th postoperative day. The remaining 14 patients underwent major and extensive surgical procedures, and were put into class 3. Here too, were also significant decreases in the activity 1, 3 and 6 days after operation. The activity remained significantly depressed 8 days after surgery, in this group of patients. These results show that depression in the production of IL 2 in postoperative surgical patients correlates relatively well with the extent of the surgical procedures.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1436-2813
    Keywords: postoperative immunodepression ; interleukin 2 ; immunological restoration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Effect of exogenous interleukin 2 (IL 2) on the postoperative depression of cell-mediated immune responsein vitro was studied in 8 patients with benign lesion and 11 patients with various carcinoma, undergoing major surgical procedures. When peripheral blood mononuclear cells (PBM) were obtained from patients 3 days after surgery, the proliferative response of PBM in mixed lymphocyte culture (MLC) was significantly decreased, as compared to that before operation. The depressed proliferative response was significantly increased and improved to the preoperative level, when exogenous IL 2 was added at a concentration of 50 per cent in culture. The defective generation of cytotoxic cells in MLC 3 days after operation was also significantly augmented and improved to the preoperative range by addition of 25 per cent IL 2 in culture. IL 2 produced minimal increase in these responses when PBM were obtained preoperatively. There was no significant difference between each value in these responses obtained from patients with benign lesion and carcinoma. These results show that PBM from patients who had undergone major surgery were responsive to exogenous IL 2. The postoperative depression of cell-mediated immune response may be reversible with exogenous IL 2.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1436-2813
    Keywords: breast carcinoma ; colony growth ; soft agar ; clinical stage ; sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An in vitro soft agar culture system was utilized to evaluate the colony growth of cells from primary breast carcinoma. A total of 53 specimens from fifty-three patients were placed in culture. Of these, 29 samples (55 per cent) formed at least 30 colonies per 500,000 cells plated. In relation to histologic type of tumor and clinical status of the disease, 4 of 4 samples from mucous carcinoma grew into colonies and, then, t-categories, i.e. histological extent of primary tumor, and colony growth showed an inverse correlation. Estrogen receptor status did not appear to influence growth of the colonies. The in vitro sensitivity studies to adriamycin showed a dose dependent increase in lethality. However, the in vitro response rate was relatively low. This assay system can be used to study the biology and clinical approaches to treatment of breast carcinoma.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1436-2813
    Keywords: cell-mediated cytotoxicity ; spleen cells ; interleukin 2 ; activated killer cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cell-mediated cytotoxic activities of cells from the spleens (SP cells) of patients with gastric carcinoma were assayed in comparison with the activities of peripheral blood mononuclear cells (PBM cells) from the same patients, and from patients with benign lesions. The natural killer cell (NK) activity of the SP cells and their capacity to generate allogeneic cytotoxicity in mixed lymphocyte culture (MLC) were very similar to those of the PBM cells. The cytotoxic activity of SP cells induced by alloactivation in MLC, however, was significantly higher than that of the PBM cells from the same patient as well as from patients with benign lesions. The production of interleukin 2 (IL 2) and the ability to induce cytotoxic cells after activation with IL 2 (LAK) were therefore examined. Both the ability to produce IL 2 and to generate LAK cells were shown to be significantly increased in SP cells when compared to PBM cells. These results indicate that the spleen may be a potential reservoir for the precursors of these activated killer cells in patients with gastric carcinoma. Furthermore, it may play an important role in the defence against tumors in these patients.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1436-2813
    Keywords: adjuvant therapy ; combination chemo-immunotherapy ; advanced gastric carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A chemo-immunotherapy program was designed on the basis of our clinical findings, which revealed that the ability to generate cell-mediated cytotoxicity was remarkably augmented after adriamycin (AM) administration in cancer patients. Twenty patients with stage IV gastric carcinoma who had undergone noncurative resections were treated with the above regimen that consisted of active immunotherapy with autologous tumor cells, in combination with 30 mg of AM, given 7 days before the immunization, followed by long-term tegafur (FT) and immunomodulators. The survival of these patients was compared to that of 3 other groups of patients, namely; 30 patients treated with another chemo-immunotherapy regimen which comprised autologous tumor cells in combination with several anticancer drugs followed by long-term FT and immunomodulators (CCI1), 17 patients treated with mitomycin C followed by long-term FT and immunomodulators (CI), and 24 patients with comparable histories (HC). The first treatment group had significantly improved survival, as compared to the HC group (p〈0.01) and the survival tended also to be more favorable, when compared to the CCIl group (p〈0.2) or the CI group (p〈0.2). Moreover, the survival rate at 9 months was significantly higher than that of either the CCI1 group (p〈0.01) or the CI group (p〈0.01).
    Type of Medium: Electronic Resource
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