I am not an expert in cancer, but I know professor Arcangeli Annarosa from U of Florence has done a lot electophysiology and cancer cells. See the manuscript published in 'Recent Pat Anticancer Drug Discov. 2012 May 8': Potassium Channels: Novel Emerging Biomarkers and Targets for Therapy in Cancer.
Also you can take a look to the work of Luis Ángel Pardo (Max Planck Institute of Experimental Medicine, Göttingen) about ion channels and cancer. Here you have links to some of his reviews:
Am J Physiol has published a whole series on that topic, starting with the Editorial in 2011: "American Journal of Physiology-Cell Physiology theme: ion channels and transporters in cancer", and still continuing 2012. If you look at scholar google with that clue, you will catch the series.
The American Journal of Physiology [Cell Physiology] (August 1, 2011 vol. 301 no.1 C253-C254) began a series of articles on the theme of "ion channels and transporters in cancer" that address the roles of ion channels in cell proliferation, apoptosis etc.and cancer. I think that this series of papers would be a good place to start.
Yes, George is right about Mustapha Djamgoz , who did an extensive work on voltage-gates sodium channels in prostate and breast cancer cells. Here are two interesting reviews:
Eur J Pharmacol. 2009 Dec 25;625(1-3):206-19. Epub 2009 Oct 14.
Molecular pharmacology of voltage-gated sodium channel expression in metastatic disease: clinical potential of neonatal Nav1.5 in breast cancer.
Onkal R, Djamgoz MB.
and
Neuroscientist. 2008 Dec;14(6):571-83. Epub 2008 Oct 20.
An emerging role for voltage-gated Na+ channels in cellular migration: regulation of central nervous system development and potentiation of invasive cancers.
Brackenbury WJ, Djamgoz MB, Isom LL.
On related topics, there are also:
Recent Pat Anticancer Drug Discov. 2007 Nov;2(3):189-202.
Voltage-gated ion channels, new targets in anti-cancer research.
Le Guennec JY, Ouadid-Ahidouch H, Soriani O, Besson P, Ahidouch A, Vandier C.
Curr Pharm Des. 2006;12(28):3681-95.
Voltage-gated sodium channels: new targets in cancer therapy?
Roger S, Potier M, Vandier C, Besson P, Le Guennec JY.