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Table 4 Correlation between timing of PCR results and rates of progression disease

From: Serial detection of circulating tumour cells by reverse transcriptase-polymerase chain reaction assays is a marker for poor outcome in patients with malignant melanoma

PCR assay results No. patients No. of PDs (%)
Baseline Follow-up   
negative negative 18 3 (17)
negative positive 56 19 (34)
positive negative 15 1 (7)
positive positive 60 26 (43)
  1. PD, progression disease