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Institute of Immunology, University of Witten/Herdecke, Stockumer Strasse 10, 58448 Witten, Germany [P. F., K. S. Z.]; Departments of Oral Biology [P. F., P. B. N., K. S. Z.] and Anatomy and Cell Biology [P. A. W., D. W. L.], McGill University; Departments of Pathology [P. J. C.] and Surgery [R. J. T.], Montreal General Hospital; and Department of Otolaryngology, Jewish General Hospital [M. B.], Montreal, Canada
The invasion and migration occurring in primary neoplastic tissue explants were studied by using a three-dimensional collagen matrix model, subsequent time-lapse videomicroscopy, and computer-assisted cell tracking. We show that not only single cells but groups of clustered cells comprising 5 to more than 100 cells detach from the primary tumor lesion and migrate within the adjacent extracellular matrix. These clusters were highly polarized, resulting in a high directional persistence of migration. Locomoting cell clusters were observed in primary cultures from invasive oral squamous cell carcinomas (6 of 9), ductal breast carcinomas (2 of 3), and rhabdomyosarcoma (1 of 1), whereas normal oral mucosa (0 of 4) was cell cluster negative. Thus, locomoting cell clusters could be a novel and potentially important mechanism of cancer cell invasion and metastasis.
1 Supported by Fritz-Bender-Foundation, Munich, Germany. Because the dynamics of the behavior of locomotiong cell clusters described in this manuscript are insufficiently documented by static images alone, essential key sequences of the source tapes have been accepted by Spektrum der Wissenschaft, the German edition of Scientific American, for publication as video documentation (ISBN 3-86025-801-X). An English version of this video production is in preparation.
2 To whom requests for reprints should be addressed.
Received 7/17/95. Accepted 8/28/95.
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