These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Early effects of radiotherapy in small cell lung cancer xenografts monitored by 31P magnetic resonance spectroscopy and biochemical analysis.
    Author: Kristjansen PE, Pedersen EJ, Quistorff B, Elling F, Spang-Thomsen M.
    Journal: Cancer Res; 1990 Aug 15; 50(16):4880-4. PubMed ID: 2165849.
    Abstract:
    31P magnetic resonance spectroscopy (31P MRS) and biochemical analysis of extracts were applied to study the metabolic response to X-irradiation of small cell lung cancer in nude mice. Two small cell lung cancer xenografts, CPH SCCL 54A and 54B, with different radiosensitivity, although derived from the same patient, were studied. A total of 126 individual tumors were examined. Following 5.0-Gy irradiation, a reversible increase in the ATP/Pi ratio, reaching twice the pretreatment level within 2 wk, was observed with 31P MRS, while 20 Gy induced a reversible decrease in the ATP/Pi ratio. The t1/2 of this decline was 2 to 3 h for 54A and about 6 h for the less radiosensitive 54B. The 31P MRS data were compared with biochemical analysis of tumors freeze-clamped and extracted at similar intervals after 20 Gy. It appeared that an acute reversible increase in Pi concentration was the major cause of the ATP/Pi decrease induced by 20 Gy. A linear correlation between ATP/Pi estimated by 31P MRS and by analytical biochemistry was found. The ATP/Pi ratio may be valuable for early assessment of radiosensitivity of small cell lung cancer tumors.
    [Abstract] [Full Text] [Related] [New Search]