Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.

Example Input: Abstract: The prognostic value of marrow chromosome findings was examined in 242 patients with preleukemic myelodysplastic syndromes (MDS) or myeloproliferative disorders (MPD), with emphasis on the significance of single versus multiple karyotypic changes. In both groups, the results showed that patients with multiple chromosome abnormalities in a marrow clone had a very high probability of early death, from progression to leukemia or from other complications of hematopoietic dysfunction. Conversely, in patients with a hemic clone having only one karyotypic alteration (involving a single chromosome or single translocation), survival over 2 years was only slightly reduced as compared to those without chromosome abnormality. The only single karyotypic alteration perhaps associated with a markedly shortened survival was monosomy 7. These findings suggest that the conclusions of previous studies concerning the grave consequences of chromosome alterations in preleukemia largely reflect the clinical significance of clones with multiple cytogenetic changes. Prior knowledge of the karyotypic status of preleukemic patients should be helpful in evaluating current attempts to find effective treatment for these difficult disorders.
Example Output: Aged

Example Input: Abstract: Effect of varying concentrations (0 to 800 microM) of three different light chains on sodium-dependent L-(14C)alanine and D-(14C)glucose uptake by rat renal brush border membrane vesicles were studied. One kappa and two lambda type light chains (lambda-1 and lambda-2) were isolated from urines of patients with multiple myeloma. At maximal inhibitory concentrations the kappa chain reduced alanine uptake from 206 +/- 18 to 77 +/- 18 pmole/mg protein (P less than 0.005) and glucose uptake from 357 +/- 22 to 146 +/- 8 pmole/mg protein (P less than 0.001). lambda-1 reduced alanine uptake from 136 +/- 17 to 60 +/- 8 pmole/mg protein (P less than 0.005) and glucose uptake from 354 +/- 17 to 77 +/- 14 pmole/mg protein (P less than 0.001). lambda-2 reduced alanine uptake from 105 +/- 9 to 28 +/- 5 pmole/mg protein (P less than 0.001) and glucose uptake from 194 +/- 7 to 66 +/- 7 pmole/mg protein (P less than 0.001). The half maximal inhibitory concentrations (I50) of kappa, lambda-1 and lambda-2 light chains were 68, 76 and 140 microM for alanine uptake and 120, 70 and 105 microM for glucose uptake. Control experiments using bovine serum albumin and beta-lactoglobulin showed no inhibitory effect on alanine and glucose uptake by either protein. These data reveal brush border membrane effects by myeloma light chains and confirm that direct Bence Jones protein nephrotoxicity may play an important role in the pathogenesis of kidney dysfunction associated with multiple myeloma.
Example Output: Alanine

Example Input: Abstract: The current studies were designed to investigate the effect of calcium channel blockers on chemically induced gastric lesions in rats. Results of this study indicate that pretreatment of male F344 rats with the calcium channel blockers verapamil, diltiazem, or Mg2+ significantly protected against ethanol- and indomethacin-induced gastric lesions as demonstrated by gross and histopathologic evaluation. Treatment of rats with calcium channel blockers before ethanol or indomethacin administration resulted in a significant decline in the mean number of lesions per glandular stomach, the damaged area of the glandular stomach, and the severity of lesions. Calcium channel blockers also caused a significant decline in the incidence of indomethacin-induced gastric lesions, but had no effect on the incidence of ethanol-induced gastric lesions. These results offer the first evidence that calcium channel blockers may play an important role in the protection against chemically induced gastric lesions and thereby offer insight into the mechanism of gastric ulcer formation. It is speculated that this knowledge may prove important in the development of new and improved therapies for the treatment and prevention of gastric ulcers in humans.
Example Output:
Alcohol, Ethyl