TY - JOUR
T1 - Phase I trial of high-dose tamoxifen in combination with cisplatin in patients with lung cancer and other advanced malignancies
AU - Perez, Edith A.
AU - Gandara, David R.
AU - Edelman, Martin J.
AU - O'Donnell, Robert
AU - Lauder, Ignacio J.
AU - DeGregorio, Michael
PY - 2003
Y1 - 2003
N2 - Background. Tamoxifen has been reported to enhance the antitumor activity of cisplatin in preclinical models by modulation of protein kinase C signal transduction and apoptosis-related pathways. Methods. We conducted a phase I study of high-dose oral tamoxifen in combination with intravenous cisplatin, with two objectives: 1) to determine tolerability, and 2) to determine the daily tamoxifen dose required to achieve serum levels equivalent to in vitro concentrations reported to enhance cisplatin cytotoxicity in preclinical models. Tamoxifen was administered days one through seven at escalating daily doses of 160mg/m2 (n = 5), 200mg/m2 (n = 6), and 250 mg/m2 (n = 4) by patient cohort, followed by cisplatin at 100 mg/m2 on day eight. Serum concentrations of tamoxifen and its hydroxylated metabolite N-desmethyltamoxifen were determined by high-performance liquid chromatography (HPLC) on day eight of the first treatment cycle in seven patients. Results. Fifteen patients with advanced malignancies received treatment with tamoxifen at 160mg/m2, 200mg/m2, and 250mg/m2 per cycle, respectively. Serum concentrations of tamoxifen and N-desmethyltamoxifen on day eight of the first cycle ranged from 1.75-8.22 μM (mean 4.72 μM) and 3.62-10.85 μM (mean 3.87 μM), respectively. Toxicity analysis demonstrated that grade 3/4 nonhematological toxicity occurred in 0/5 at a tamoxifen dose of 160mg/m2, 1/6 at a tamoxifen dose of 200 mg/m2, and in 1/4 patients at the 250 mg/m2 dose level. No grade 4 hematological toxicity occurred. Classic dose-limiting toxicity was not observed; the trial was closed to further accrual after documentation that targeted tamoxifen levels (around 5 μM) were achieved with daily tamoxifen doses > 160mg/m2 in combination with cisplatin. Conclusions. This regimen of high-dose tamoxifen in combination with cisplatin can be safely administered. Serum tamoxifen levels comparable to concentrations required for enhancement of cisplatin sensitivity in vitro are clinically achievable with acceptable toxicity. The level of antitumor activity in nonsmall cell lung cancer NSCLC is encouraging (partial response in 4/10 patients). Based on these data, a Phase II study of high-dose tamoxifen in combination with cisplatin in patients with metastatic NSCLC is being conducted through the Southwest Oncology Group.
AB - Background. Tamoxifen has been reported to enhance the antitumor activity of cisplatin in preclinical models by modulation of protein kinase C signal transduction and apoptosis-related pathways. Methods. We conducted a phase I study of high-dose oral tamoxifen in combination with intravenous cisplatin, with two objectives: 1) to determine tolerability, and 2) to determine the daily tamoxifen dose required to achieve serum levels equivalent to in vitro concentrations reported to enhance cisplatin cytotoxicity in preclinical models. Tamoxifen was administered days one through seven at escalating daily doses of 160mg/m2 (n = 5), 200mg/m2 (n = 6), and 250 mg/m2 (n = 4) by patient cohort, followed by cisplatin at 100 mg/m2 on day eight. Serum concentrations of tamoxifen and its hydroxylated metabolite N-desmethyltamoxifen were determined by high-performance liquid chromatography (HPLC) on day eight of the first treatment cycle in seven patients. Results. Fifteen patients with advanced malignancies received treatment with tamoxifen at 160mg/m2, 200mg/m2, and 250mg/m2 per cycle, respectively. Serum concentrations of tamoxifen and N-desmethyltamoxifen on day eight of the first cycle ranged from 1.75-8.22 μM (mean 4.72 μM) and 3.62-10.85 μM (mean 3.87 μM), respectively. Toxicity analysis demonstrated that grade 3/4 nonhematological toxicity occurred in 0/5 at a tamoxifen dose of 160mg/m2, 1/6 at a tamoxifen dose of 200 mg/m2, and in 1/4 patients at the 250 mg/m2 dose level. No grade 4 hematological toxicity occurred. Classic dose-limiting toxicity was not observed; the trial was closed to further accrual after documentation that targeted tamoxifen levels (around 5 μM) were achieved with daily tamoxifen doses > 160mg/m2 in combination with cisplatin. Conclusions. This regimen of high-dose tamoxifen in combination with cisplatin can be safely administered. Serum tamoxifen levels comparable to concentrations required for enhancement of cisplatin sensitivity in vitro are clinically achievable with acceptable toxicity. The level of antitumor activity in nonsmall cell lung cancer NSCLC is encouraging (partial response in 4/10 patients). Based on these data, a Phase II study of high-dose tamoxifen in combination with cisplatin in patients with metastatic NSCLC is being conducted through the Southwest Oncology Group.
KW - Adult
KW - Aged
KW - Antineoplastic Combined Chemotherapy Protocols/therapeutic use
KW - Cisplatin/administration & dosage
KW - Drug Administration Schedule
KW - Duodenal Neoplasms/drug therapy
KW - Female
KW - Hematologic Diseases/chemically induced
KW - Humans
KW - Lung Neoplasms/drug therapy
KW - Male
KW - Middle Aged
KW - Remission Induction
KW - Tamoxifen/administration & dosage
KW - Thymoma/drug therapy
KW - Thymus Neoplasms/drug therapy
KW - Thyroid Neoplasms/drug therapy
KW - Treatment Outcome
UR - http://www.scopus.com/inward/record.url?scp=0037215050&partnerID=8YFLogxK
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=purepublist2023&SrcAuth=WosAPI&KeyUT=WOS:000181475600001&DestLinkType=FullRecord&DestApp=WOS
U2 - 10.1081/CNV-120016397
DO - 10.1081/CNV-120016397
M3 - Article
C2 - 12643003
SN - 0735-7907
VL - 21
SP - 1
EP - 6
JO - Cancer Investigation
JF - Cancer Investigation
IS - 1
ER -
