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  • 1
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: We have examined genetic alterations in 11 surgically removed oral squamous cell carcinomas (OSCCs) using comparative genomic hybridization (CGH) and laser scanning cytometry (LSC), which allow quantitative analysis of chromosomal abnormalities. CGH analysis revealed gains and/or losses of DNA sequence copy number in all tumors. Gains in DNA sequence copy number were detected frequently for chromosome arms 3q25–28 (6/11), 5p (6/11) and 8q (5/11), and losses in chromosome arms 18q (4/11), 19q (4/11), 17p (3/11), and 19p (3/11). Amplification of 5p was observed in two tumors. LSC detected DNA aneuploidy with DNA indices ranging from 1.30 to 1.82 in 6 of 11 tumors. The number of chromosomal aberrations was higher in DNA aneuploid tumors than in diploid tumors (8.17 vs 3.60/tumor, P〈0.05). Furthermore, the average number of chromosomal aberrations was significantly higher in stage T2 tumors and larger tumors than in stage T1 tumors (7.71 vs 3.25/tumor, P〈0.05). Our results suggest that DNA aneuploidy and large tumor size reflect an underlying chromosomal instability.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We detected genetic alterations in 14 cell lines established from 14 human oral squamous cell carcinomas (OSCCs) using comparative genomic hybridization (CGH), which allows a comprehensive analysis of chromosomal imbalances and identification of nonrandom genetic aberrations specific to OSCCs. All cell lines showed gains and losses of DNA copy number. DNA losses were detected for chromosomes 18q (10/14) and 4q (9/14) with minimal overlapping regions of 18q 12–32 and 4q31-qter, respectively. In contrast, the common sites for increased copy number were chromosomes 5p (12/14), 8q23-ter (11/14), 20p (8/14), 20q (8/14), and 3q25-ter (7/14). These results suggest that losses of 18q12–22 and 4q31-ter and gains of 5p and 8q23-ter play important roles in the development and/or progression of OSCC.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: FF6 tumor cells are dervied from a spontaneous rat squamous cell carcinoma (SCC) which originally arose in the facial skin of a DA rat. In this study, FF6 tumor cells were implanted into rat oral mucosa to establish an in vivo metastatic model. We analyzed the expression of intercellular cell adhesion molecule-1 (ICAM-1) in the implanted primary and metastatic FF6 tumors by immunostaining with a monoclonal antibody (mAb) against ICAM-1. The implanted primary FF6 cells showed strong expression of ICAM-1, whereas the tumor cells of metastatic lesions showed weak or negative expression of ICAM-1. By imiminostaining with rnAb OX6, a number of MHC class II-positive macro-phages were detected in tumor mesenchyme and surrounding the metastatic foci. These results suggested that the local immune reaction in the lymph node influenced the expression of ICAM-1 on tumor cells, and that MHC class II-positive macrophages may play a role in transplanted tumor growth and metastases.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1437-7772
    Keywords: oral cancer ; cisplatin ; pirarubicin ; intra-arterial infusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background A comparison of chemotherapy with PP (cisplatin, CDDP; and peplomycin, PEP) and TPP (4′-O-tetrahydropyranyladriamycin: THP-ADM, CDDP and PEP) in the treatment of oral cancer. Methods This study included 159 out of 199 patients who had visited the collaborating institutions' hospitals, and who had been registered in the Examination Meeting of Chemotherapy for Oral Cancer during the 2-year period from June 1990 to May 1992. Ninety-seven patients underwent PP therapy and 62 underwent TPP therapy. In PP intravenous infusion therapy, 60–80 mg of CDDP per m2 was administered on day 1, followed by infusion of 5–7.5 mg of PEP per m2 from day 2 until day 6. In the PP intra-arterial infusion therapy, in which the drugs were infused in a retrograde fashion into the superficial temporal artery, 50–70 mg of CDDP per m2 was infused on day 1, followed by infusion of 5 mg of PEP per m2 from day 2 until day 6. In both the intravenous and intra-arterial TPP therapy regimens, 20 mg of THP-ADM per m2 was infused on day 1, followed by infusion of 50 mg of CDDP per m2 on day 2, and infusion of 5 mg of PEP per m2 from day 3 until day 7. Results The response rate of TPP therapy was 64.5%, which was not significantly different from the 53.6% obtained with PP therapy. However, the complete response (CR) rate with TPP therapy was 22.6%, significantly higher than the 9.3% with PP therapy. The response rate of TPP intra-arterial infusion therapy was particularly high (92.3%), and significantly higher than that of PP therapy. The response rate of TPP intra-arterial infusion therapy was very high (100.0%) in stage I and II patients and in primary cancers of the tongue, gingiva, buccal mucosa, and hard palate. The toxicity of TPP and PP therapies resulted in a high incidence of nausea/vomiting and anorexia. Skin disorders and epilation were observed at high rates with TPP therapy, and incidences were particularly high (100.0%) in the TPP intra-arterial infusion therapy group. The incidence of leukopenia was high in patients treated with TPP therapy but was not severe. Conclusion The results of this study suggest that TPP therapy is more effective than PP therapy in the treatment of oral cavity cancer. Although TPP therapy was associated with skin abnormalities, alopecia, and leukopenia as side effects, there was no influence on subsequent treatment. TPP intra-arterial infusion therapy appears promising in the treatment of oral cancer.
    Type of Medium: Electronic Resource
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