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Decrease in circulating tumor cells as an early marker of therapy effectiveness.

J C Bystryn1, J Albrecht, S R Reynolds

  • 1Kaplan Comprehensive Cancer Center, NYU School of Medicine, NY, USA.

Recent Results in Cancer Research. Fortschritte Der Krebsforschung. Progres Dans Les Recherches Sur Le Cancer
|November 25, 2000
PubMed
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Melanoma cells in circulation decreased significantly after a melanoma vaccine treatment. This suggests that monitoring circulating tumor cells could be an early indicator of therapy effectiveness in melanoma patients.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Circulating melanoma cells are present in many patients and may indicate disease extent.
  • Monitoring these cells could offer early insights into treatment efficacy.

Purpose of the Study:

  • To assess the impact of a melanoma vaccine on circulating melanoma cell counts.
  • To determine if changes in circulating melanoma cells can serve as an early marker for therapy response.

Main Methods:

  • Polymerase chain reaction (PCR) was used to detect melanoma cells expressing specific antigens (MART-1, MAGE-3, tyrosinase, gp100).
  • Circulating melanoma cells were quantified in 43 patients before and after 4 and 7 months of melanoma vaccine therapy.

Main Results:

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  • Melanoma cells were detected in 32% of patients before treatment.
  • Following vaccination, detection rates dropped to 21% at 4 months and 7% at 7 months.
  • This represents a 78% clearance rate in initially positive patients, with a steady decline over time.

Conclusions:

  • Melanoma vaccine therapy is associated with a significant reduction in circulating melanoma cells.
  • The disappearance of circulating tumor cells may serve as an early indicator of treatment efficacy in melanoma.
  • Further studies are needed to correlate these findings with clinical outcomes.