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. 2015 May 8;6(13):10697–10711. doi: 10.18632/oncotarget.4037

Table 2. Prognostic significance of CTC counts in phase II and III clinical trials in cancers of various tissues.

Tumor Tissue CTC detection rate Phase of Trial Prognostic relevance References
Breast 91% (n = 41 of 45) II 42.9% of patients had 12 months of survival with CTCs (≥1). [114]
Breast 11.2%(n = 51 of 455) III Not applicable. [115]
Breast 39% (n = 148 of 378) II 75% of trastuzumab-treated group showed CK19-negative CTCs. [116]
Colon 37.5% (n = 180 of 480) III 41% of CTC-positive (≥5) patients had 24 months survival. [117]
Lung 44.4% (n = 8 of 18) II 76.5% patients showed favorable CTC counts. [118]
Lung 78% (n = 32 of 41) II 18% of patients with ≥5 CTCs converted to favorable CTCs (<5). [119]
Ovary 32.1% (n = 216 of 672) III CTC count was not correlated with survival. [120]
Prostate 66% (n = 263 of 400) III Median progression-free survival times, 25.1 months (<3 CTCs) and 16.2 months (≥3 CTCs). [121]
Prostate 71.5% (n = 88 of 123) I/II 47% of patients with ≥2 positive and 28% of patients with <2 CTC biomarkers showed distant relapse. [122]
Prostate 35.4% (n = 11 of 31) II Overall survival rate for 36 months was positive for 55% of patients with 1 positive and 42% of patients with 2-3 positive CTC biomarkers. [123]
Pancreas 37.5% (n = 19 of 51) II Median overall survival times, 17.4 to 25.3 months (<2 CTCs) and 12.4 months (≥2 CTCs). [124]
Skin ~13-17.5% (n = 44-56 of 320) III Unable to correlate with disease characteristics owing to low CTC counts. [125]
Skin 86% (n = 214 of 269) III Increased progression-free survival with decreased CTC counts. [126]