peplomycin and Colonic-Neoplasms

The chemosensitivity of various head and neck cancers was investigated with the 5-day rapid thymidine incorporation assay in soft agar culture. The evaluability rate was 56%. Head and neck cancers were sensitive in vitro, in decreasing order, to peplomycin, cisplatin, bleomycin, 5-fluorouracil, mitomycin C, and doxorubicin. Primary tumors and neck metastases exhibited the same sensitivity, with 21% of all specimens tested responding. In vitro chemosensitivities were similar among patients younger than 69 years of age and those older than 70. The predictive accuracy for sensitivity tested prospectively in five cases was 80% and that for resistance in four was 75%.

Topics: Aged; Antibiotics, Antineoplastic; Antineoplastic Agents; Bleomycin; Child; Cisplatin; Colonic Neoplasms; DNA, Neoplasm; Doxorubicin; Drug Screening Assays, Antitumor; Fluorouracil; Head and Neck Neoplasms; Humans; Lymphatic Metastasis; Methotrexate; Middle Aged; Mitomycins; Peplomycin; Remission Induction; Stomach Neoplasms; Thymidine; Tritium; Tumor Cells, Cultured

Tumor cells derived from 13 different individual human tumors were plated in a colony forming monolayer assay. The effect of bleomycin and peplomycin on colony formation was assessed in normothermic conditions and after a hyperthermic treatment at 40.5 degrees C for 2 h at the beginning of the culture. In three out of the 13 tumor samples (two colon carcinomas, one malignant melanoma), hyperthermic incubation resulted in a thermal enhancement of the effects of bleomycin and peplomycin. In addition, human bone marrow progenitor cells (CFU-C) were subjected to the same procedure. Peplomycin proved to be less toxic to CFU-C than bleomycin. In samples from eight different donors, homogeneous dose-response curves were observed. There was no difference between normo- and hyperthermic incubation.

Topics: Bleomycin; Cell Survival; Colonic Neoplasms; Colony-Forming Units Assay; Dose-Response Relationship, Drug; Gallbladder Neoplasms; Hematopoietic Stem Cells; Hot Temperature; Humans; Lung Neoplasms; Melanoma; Myosarcoma; Neoplastic Stem Cells; Peplomycin; Tumor Stem Cell Assay

The antitumor activity of several chemotherapeutic agents against a total of 30 clinical samples obtained from 30 human tumors from the esophagus (12), stomach (10), colorectum (6) and lung (2), were tested by subrenal capsule assay (SRCA) using normal immuno-competent BDF, mice. The antitumor activity was evaluated by changes in both tumor size (delta TS method) and tumor growth inhibition rate (TGIR method). Among the 30 tumors, 15 were also tested by human tumor clonogenic assay (HTCA) and the results obtained in the two assays were compared. In the SRCA, adequate growth of the tumor in the control group for evaluation of the response of the treated group was obtained from 27 out of 30 tumors (90%). With activity criteria set at delta TS less than or equal to -1.0 dmm and TGIR greater than or equal to 50%, 41% of the drugs tested were active in delta TS while 27% were active in TGIR. When relationships between antitumor activities evaluated by delta TS and TGIR was compared, both activities were well correlated (r = -0.64). Correlations between tumor responses in the HTCA and in the SRCA were tested in 6 tumors treated with 20 drugs. The overall accuracy was 60% by the TGIR method and 70% by the delta TS method, respectively.

Topics: Animals; Antineoplastic Agents; Bleomycin; Cisplatin; Colonic Neoplasms; Colony-Forming Units Assay; Doxorubicin; Esophageal Neoplasms; Humans; Mice; Mitomycin; Mitomycins; Peplomycin; Rectal Neoplasms; Stomach Neoplasms; Tumor Stem Cell Assay; Vindesine

The cytotoxic effect of bleomycin and peplomycin was compared using a methylcellulose monolayer assay for the cultivation of human tumor cells. In 3 out of 4 samples from human malignant melanomas peplomycin proved to be more cytotoxic than bleomycin. Peplomycin was more cytotoxic than bleomycin in 1 of 5 myosarcoma samples, whereas 2 samples from squamous cell carcinomas of the lung showed identical dose response curves. In 1 carcinoma of the gall bladder peplomycin was more toxic than bleomycin.

Topics: Bleomycin; Cells, Cultured; Colonic Neoplasms; Colony-Forming Units Assay; Dose-Response Relationship, Drug; Humans; Lung Neoplasms; Melanoma; Myosarcoma; Peplomycin; Tumor Stem Cell Assay; Urinary Bladder Neoplasms