CLINICAL EVALUATION OF AN IN VITRO TEST FOR RADIOSENSITIVITY OF LEUKEMIC LYMPHOCYTES

Journal Article · Mon Oct 01 04:00:00 EDT 1962 · Blood (U.S.)

OSTI ID:4763865

Schrek, R; Leithold, S L; Friedman, I A; Best, W R

A recently developed slide-chamber method was used to test the radiosensitivity of blood lymphocytes from 80 patients with chronic lymphocytic or lymphosarcoma-cell leukemia. The objective of this study was to determine whether these in vitro tests on sensitivity to x rays had any clinical significance. Two objective criteria were used to measure the clinical reactions of the leukemic patients. The first was the duration of survival of patients following the in vitro test. The second was the minimal leukocyte count of a patient following x ray therapy; the minimal count was expressed as a percentage of the count before therapy. The in vitro radiosensitivity was measured by the 10 per cent survival time of lymphocytes irradiated with 1000 r. Blood lymphocytes from non-leukemic individuals were highly radiosensitive with indices of 1.1 to 2.2 days. In initial tests, the lymphocytes of 61 leukemic patients had the same high sensitivity to x rays as lymphocytes from non-leukemic individuals. In contrast, the lymphocytes of 19 leukemic patients were radioresistant to irradiation with indices of 2.5 to 11 days. The 61 patients with radiosensitive lymphocytes had a median survival time of 22 months after the in vitro test. In contrast, the 19 patients with radioresistant lymphocytes had a median survival time of only 4 months. Clinical x ray therapy caused a greater decline in leukocyte counts in patients with radiosensitive lymphocytes than in those with radioresistant cells. A sigficant index of 0.60 was obtained for the correlation of in tro radiosensitivity of lymphocytes and the in vivo deease in leukocyte counts of patients after x ray therapy. It is included that an in vitro finding of radioresistant lymphocytes is correlated with a poor response of the leukocyte count to x ray therapy and a short survival time of the patient. (auth)

• Research Organization: Veterans Administration Hospital, Hines, Ill.; and Cook County Hospital, Chicago
• NSA Number: NSA-16-031486
• OSTI ID: 4763865
• Journal Information: Blood (U.S.), Journal Name: Blood (U.S.) Vol. Vol: 20; ISSN BLOOA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
LEUKEMIA
LYMPHOCYTES
MAN
QUANTITY RATIO
RADIOSENSITIVITY
RADIOTHERAPY
X RADIATION