Invasion Metastasis. ;6(1) Variability of cell size in primary and metastatic human breast carcinoma. Bell CD, Waizbard E. Macroscopic. Jan 8, - Cell size versus CTC count. There appeared to be no correlation between CTC cell size and cell count for CTCs identified by CellSearch from patients with metastatic castrate resistant prostate cancer. The cell size ranged from µm to µm; while the CTC count varied from 11 to Abstract · Introduction · Materials and Methods · Results and Discussion.