PMID- 15459489 OWN - NLM STAT- MEDLINE DCOM- 20041026 LR - 20220227 IS - 0030-2414 (Print) IS - 0030-2414 (Linking) VI - 67 IP - 1 DP - 2004 TI - Protein kinase C alpha expression in breast and ovarian cancer. PG - 1-10 AB - In recent years research has focused on the development of specific, targeted drugs to treat cancer. One approach has been to block intracellular signaling proteins, such as protein kinase C alpha (PKC-alpha). To help support the rationale for clinical studies of a PKC-alpha-targeted therapy in breast and ovarian cancers, we reviewed publications studying PKC-alpha expression in these tumors. Since these investigations were mostly performed in cell lines, we supplemented this review with some preliminary findings from studies examining PKC-alpha expression in tumor tissue biopsies obtained from patients with breast and ovarian cancer. Based on the reviewed publications using representative cell lines and our preliminary findings on tumor tissue of patients with breast cancer, we infer that PKC-alpha levels may especially be increased in breast cancer patients with low or negative estrogen receptor (ER) levels. Thus, clinical studies determining efficacy of selective or specific inhibitors of PKC-alpha should include determination of ER status in order to help answer whether blocking PKC-alpha in patients with low or absent ER can result in clinical benefit. CI - Copyright 2004 S. Karger AG, Basel FAU - Lahn, Michael AU - Lahn M AD - Divison of Oncology Product Development, Lilly Research Laboratories, Eli Lilly, Indianapolis, IN 46285, USA. MichaLahn@aol.com FAU - Kohler, Gabriele AU - Kohler G FAU - Sundell, Karen AU - Sundell K FAU - Su, Chen AU - Su C FAU - Li, Shuyu AU - Li S FAU - Paterson, Blake M AU - Paterson BM FAU - Bumol, Thomas F AU - Bumol TF LA - eng PT - Journal Article PT - Review PL - Switzerland TA - Oncology JT - Oncology JID - 0135054 RN - 0 (Antineoplastic Agents) RN - 0 (Enzyme Inhibitors) RN - 0 (Oligonucleotides, Antisense) RN - 0 (Phosphorothioate Oligonucleotides) RN - 0 (Receptors, Estrogen) RN - EC 2.7.11.13 (PRKCA protein, human) RN - EC 2.7.11.13 (Protein Kinase C) RN - EC 2.7.11.13 (Protein Kinase C-alpha) RN - FMT95051CQ (aprinocarsen) SB - IM MH - Antineoplastic Agents/therapeutic use MH - Breast Neoplasms/*enzymology/epidemiology/genetics MH - Drug Resistance, Multiple MH - Drug Resistance, Neoplasm MH - Enzyme Inhibitors/therapeutic use MH - Female MH - Gene Expression Regulation, Enzymologic MH - Gene Expression Regulation, Neoplastic MH - Humans MH - Oligonucleotides, Antisense/therapeutic use MH - Ovarian Neoplasms/*enzymology/epidemiology/genetics MH - Phosphorothioate Oligonucleotides MH - Protein Kinase C/antagonists & inhibitors/genetics/*metabolism MH - Protein Kinase C-alpha MH - Receptors, Estrogen/metabolism RF - 72 EDAT- 2004/10/02 05:00 MHDA- 2004/10/27 09:00 CRDT- 2004/10/02 05:00 PHST- 2003/06/13 00:00 [received] PHST- 2004/01/19 00:00 [accepted] PHST- 2004/10/02 05:00 [pubmed] PHST- 2004/10/27 09:00 [medline] PHST- 2004/10/02 05:00 [entrez] AID - 80279 [pii] AID - 10.1159/000080279 [doi] PST - ppublish SO - Oncology. 2004;67(1):1-10. doi: 10.1159/000080279.