Prostate cancer and other xenografts from cells in peripheral blood of patients.

Good models for the investigation of human prostate cancer are few. Cells from approximately 9.2-21 ml of peripheral blood from patients with metastatic prostate cancer or metastatic colon cancer were injected s.c. into nude mice. Prostate cancer from 2 of 11 patients and colon cancer from 1 of 3 patients were found to be growing as metastases in the lungs of the nude mice. To our knowledge, this is the first report of the formation of xenografts from carcinoma cells taken directly from the peripheral blood of patients. Expanding circulating cancer cells with this approach may have important translational applications including: (a) development of models of human cancers; and (b) sampling of cancers from specific patients for novel molecular and therapeutic approaches.

[Combined conservative treatment of localized stomach lymphoma]. / Kombinierte konservative Behandlung von lokalisierten Magenlymphomen.

In a twelve-year period (1980-1992) 23 patients (9 men, 14 women; mean age 65 [25-82] years) with malignant non-Hodgkin lymphoma of the stomach, in localized stage I or II (Ann Arbor classification), were given chemo- and radiotherapy without preceding operation. The results were compared with those of a group of 34 patients (19 men, 15 women; mean age 55 [17-77] years) who had been admitted during the same period, having first been treated by surgical resection and most of them additionally by chemo- and/or radiotherapy. Three not previously operated patients with inadequate response to chemotherapy subsequently underwent laparotomy and remained in remission after further treatment. There was in each group one fatal recurrence. Five-year total probability of survival in the operated and non-operated groups was 90% and 92%, respectively; five-year total recurrence-free probability was 88% and 86%, respectively. There were no cases of severe bleeding or perforation. These results demonstrate that conservative management of localized gastric lymphoma by combined chemo- and radiotherapy does not bring about a rise in recurrence rate and does not seem to be inferior to surgical treatment.