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Home: Oncology Leader Commentary: C Kent Osbourne, MD

Click on the topic below for comments by Dr C Kent Osborne to comment on. You will also find links to related articles and clinical trials.

Problems with estrogen receptor assays
Cut-off for ER-positivity
Receptor assays in metastatic disease
Mechanism of action of Faslodex
Receptor downregulation and Faslodex
Faslodex effects in the laboratory
Randomized trials comparing Faslodex to Arimidex
Tolerability of Faslodex
Other trials of Faslodex
Future Clinical role of Faslodex
Intramuscular injection of Faslodex
Clinical trials of adjuvant Faslodex
Management of DCIS
Future trials of Faslodex plus estrogen

Future Clinical role of Faslodex

Interview with Neil Love, MD Breast Cancer Update for Medical Oncologists, Program 6 2000

Play Audio Below:

Dr. Osborne: I think we’re going to have a little bit of a dilemma, and maybe several choices. It looks like the aromatase inhibitors are a little bit better than tamoxifen, and so could they arguably be first-line therapy? Arimidex is now approved for first-line therapeutic metastatic disease. Maybe letrozole will be, too.

Dr. Love: Are you currently using Arimidex or using aromatase inhibitors as first-line?

Dr. Osborne: I do, particularly in patients who have had prior tamoxifen adjuvant therapy.

Dr. Love: What about choosing an aromatase inhibitor right now? How do you see the three that are available and how do you make that choice?

Dr. Osborne: I think they’re all probably pretty good. I can’t see any major differences between them. I guess I got in the habit of writing Arimidex, because it came out first. I think any one of those is. I just happen to have most of my experience with Arimidex.

Dr. Love: Again, getting back to clinical decision-making. I’m sure it’s going to take a while to sort of shake out. But assuming Faslodex is available and you had a postmenopausal women who was presenting with metastatic breast cancer, where you wanted to use hormonal therapy, any thoughts about how you would choose between tamoxifen, an aromatase inhibitor and Faslodex?

Dr. Osborne: I would probably, if they were all three available today and all I knew about them was what I know today, I would probably choose Faslodex. I don’t think it would be a particular mistake to try Arimidex or letrozole, and maybe it’s not even a mistake to go with tamoxifen first and give it a try and then, when those patients progress, then go with these therapies. My guess is, from a survival point of view, it may in the end not make much difference. But, if I have to look at them today – to me – maybe Faslodex is slightly better, based on the results of this one trial, showing a significant prolongation of the duration of response in responding patients.

Relevant Articles:

Combined endocrine treatment of elderly postmenopausal patients with metastatic breast cancer - A randomized trial of tamoxifen vs. tamoxifen plus aminoglutethimide and hydrocortisone and tamoxifen plu fluoxymesterone in women above 65 years of age.
Rose, C.; Kamby, C.; Mouridsen, H. T.; Andersson, M.; Bastholt, L.; Moller, K. A.; Andersen, J.; Munkholm, P.; Dombernowsky, P., and Christensen, I. J. (Reprint available from: Rose C Odense Univ Hosp, Dept Oncol DK-5000 Odense C Denmark). Breast Cancer Research & Treatment. 61(2):103-110, 2000 May.

Activity of exemestane in metastatic breast cancer after failure of nonsteroidal aromatase inhibitors: A phase II trial.
Lonning, P. E.; Bajetta, E.; Murray, R.; Tubiana-Hulin, M.; Eisenberg, P. D. Mickiewicz, E.; Celio, L.; Pitt, P.; Mita, M.; Aaronson, N. K.; Fowst, C.; Arkhipov, A.; di Salle, E.; Polli, A., and Massimini, G. Journal of Clinical Oncology. 18(11):2234-2244, 2000 Jun.

Exemestane is superior to megestrol acetate after tamoxifen failure in postmenopausal women with advanced breast cancer: Results of a phase III randomized double-blind trial.
Kaufmann, M.; Bajetta, E.; Dirix, L. Y.; Fein, L. E.; Jones, S. E.; Zilembo, N.; Dugardyn, J. C.; Nasurdi, C.; Mennel, R. G.; Cervek, J.; Fowst, C.; Polli, A.; di Salle, E.; Arkhipov, A.; Piscitelli, G.; Miller, L. L., and Massimini, G. Journal of Clinical Oncology. 18(7):1399-1411, 2000 Apr.

Cellular responses of mammary carcinomas to aromatase inhibitors: Effects of vorozole. Breast.
Christov, K.; Shilkaitis, A.; Green, A.; Mehta, R. G.; Grubbs, C.; Kelloff, G., and Lubet, R. (Reprint available from: Christov K Univ Illinois, Dept Surg Oncol 840 S Wood St,M-C 820 Chicago, IL 60612 USA). Cancer Research & Treatment. 60(2):117-128, 2000 Mar.

Anastrozole versus tamoxifen as first-line therapy for advanced breast cancer in 668 postmenopausal women: Results of the tamoxifen or arimidex randomized group efficacy and tolerability study.
Bonneterre, J.; Thurlimann, B.; Robertson, J. F. R.; Krzakowski, M.; Mauriac, L.; Koralewski, P.; Vergote, I.; Webster, A.; Steinberg, M., and von Euler, M. Journal of Clinical Oncology. 18(22):3748-3757, 2000 Nov 15.

Formestane is feasible and effective in elderly breast cancer patients with comorbidity and disability.
Venturino, A.; Comandini, D.; Granetto, C.; Audisio, R. A.; Castiglione, F.; Rosso, R., and Repetto, L. (Reprint available from: Venturino A PO S Lazzaro, Via P Belli 26 I-12051 Alba CN Italy). Breast Cancer Research & Treatment. 62(3):217-222, 2000 Aug. In process

Critique of survival update analysis from two phase III anastrozole clinical trials.
Buzdar, A. U.; Wood; Wolter; Vogel; Bland, and Ravdin. Annals of Surgical Oncology. 6(8 Suppl S):8S-11S, 1999 Dec. No abstract

Letrozole: Which dose to be used?
Buzdar, A. U. Journal of Clinical Oncology. 18(8):1802-1803, 2000 Apr. No abstract

Is ICI 182,780 an antiprogestin in addition to being an antiestrogen?
Zand, R. S. R.; Grass, L.; Magklara, A.; Jenkins, D. J. A., and Diamandis, E. P. (Reprint available from: Zand RSR Mt Sinai Hosp, Dept Pathol & Lab Med 600 Univ Ave Toronto ON M5G 1X5 Canada). Breast Cancer Research & Treatment. 60(1):1-8, 2000 Mar.

Selective estrogen receptor modulators: Structure, function, and clinical use [Review].
Osborne, C. K. and Fuqua, S. A. W. Journal of Clinical Oncology. 18(17):3172-3186, 2000 Sep.

Development of a novel, "pure" antiestrogen.
Howell, A.; Osborne, C. K.; Morris, C., and Wakeling, A. E. ICI 182,780 (Faslodex (TM)) -. Cancer. 89(4):817-825, 2000 Aug 15.

Similarities and distinctions in the mode of action of different classes of antioestrogens [Review].
Wakeling, A. E. Endocrine-Related Cancer. 7(1):17-28, 2000 Mar. No abstract

Approaches targeted to estrogen receptors for treatment of tamoxifen-resistant breast cancer: A brief overview.
Terakawa, N. (Reprint available from: Terakawa N Tottori Univ, Sch Med, Dept Obstet & Gynecol Yonago Tottori 683 Japan).. Oncology. 59(Suppl 1):3-4, 2000. No abstract

Treatment with the pure antiestrogen faslodex (ICI 182780) induces tumor necrosis factor receptor 1 (TNFR1) expression in MCF-7 breast cancer cells.
Smolnikar, K.; Loffek, S.; Schulz, T.; Michna, H., and Diel, P. (Reprint available from: Smolnikar K DSHS Cologne, Inst Morphol & Tumor Res Carl Diem Weg 6 D-50927 Cologne Germany). Breast Cancer Research & Treatment. 63(3):249-259, 2000 Oct. In process

Symposium overview: Estrogens and antiestrogens in managing the patient with breast cancer.
Newman, L. A.; Wood, W. C.; Sellin, R. V.; Morrow, M.; Vogel, C., and Singletary, S. E (Reprint available from: Singletary SE Univ Texas, MD Anderson Canc Ctr, Dept Surg Oncol 1515 Holcombe Blvd,Box 106 Houston, TX 77030 USA).. Annals of Surgical Oncology. 7(8):568-574, 2000 Sep. In process

Anastrozole is superior to tamoxifen as first-line therapy for advanced breast cancer in postmenopausal women: Results of a North American multicenter randomized trial.
Nabholtz, J. M.; Buzdar, A.; Pollak, M.; Harwin, W.; Burton, G.; Mangalik, A.; Steinberg, M.; Webster, A., and von Euler, M. Journal of Clinical Oncology. 18(22):3758-3767, 2000 Nov 15.

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