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Statistical evaluation of cell kinetic data from DNA flow cytometry (FCM) by the EM algorithm

In English

Författare

Summary, in English

Flow cytometric DNA measurements yield the amount of DNA for each of a large number of cells. A DNA histogram normally consists of a mixture of one or more constellations of G0/G1-, S-, G2/M-phase cells, together with internal standards, debris, background noise, and one or more populations of clumped cells. We have modelled typical DNA histograms as a mixed distribution with Gaussian densities for the G0/G1 and G2/M phases, an S-phase density, assumed to be uniform between the G0/G1 and G2/M peaks, observed with a Gaussian error, and with Gaussian densities for standards of chicken and trout red blood cells. The debris is modelled as a truncated exponential distribution, and we also have included a uniform background noise distribution over the whole observation interval. We have explored a new approach for maximum-likelihood analyses of complex DNA histograms by the application of the EM algorithm. This algorithm was used for four observed DNA histograms of varying complexity. Our results show that the algorithm works very well, and it converges to reasonable values for all parameters. In simulations from the estimated models, we have investigated bias, variance, and correlations of the estimates.

Avdelning/ar

Publiceringsår

1989

Språk

Engelska

Sidor

695-705

Publikation/Tidskrift/Serie

Cytometry

Volym

10

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Cancer and Oncology

Nyckelord

  • DNA-histogram analysis
  • maximum-likelihood estimation
  • cell-cycle compartments

Status

Published

Forskningsgrupp

  • Spatio-Temporal Stochastic Modelling Group

ISBN/ISSN/Övrigt

  • ISSN: 0196-4763