Breast Cancer, Obesity
Conditions
Keywords
Breast cancer, Pharmacokinetics, Obesity, Doxorubicin, Cyclophosphamide, Weight
Brief summary
To determine the effect of weight on doxorubicin and cyclophosphamide plasma clearance in participants who are normal weight (body mass index \[BMI\] \< 25 kg/m2, overweight or class I obese (BMI 25-34.9 kg/m2), or class II-III obese (BMI ≥ 35 kg/m2). The hypothesis is that participants who weigh more will have higher doxorubicin and cyclophosphamide clearances than participants who weigh less. Restated, the area under the drug-concentration time profile, also known as the AUC, in participants will decrease as participant weight increases.
Detailed description
This single site study will be conducted at the UT Southwestern Simmons Cancer Center. This study is designed to measure drug concentrations in the blood of 18 female breast cancer patients who require doxorubicin (30 minute infusion) and cylcophosphamide (30 minute infusion) as part of standard medical care. Up to a total of 40 adult female participants will be consented for the study at the cancer center. Eighteen of these participants are needed to complete the study. The others will likely be screen failures. The participants will have no more than 100 ml of blood drawn via a peripheral intravenous catheter just prior to the doxorubicin infusion, and then at 0.5, 1, 1.5, 2, 3, 4, 5, 12-24, and 24-72 h after the beginning of the doxorubicin infusion. The 5 hour blood draw is optional. The intravenous catheter will be removed when the participant is discharged from the cancer center on day 1. The participant will be asked to return to the cancer center at 12-24 and 24-72 hours to have the final 2 blood draws conducted. The participants must be treated with Doxurubicin and Cyclophosphamide in order to participate in this pharmacokinetic analysis study.
Interventions
DRUGDoxorubicin
Dosed by the patient's treating physician according to local standard of care.
DRUGCyclophosphamide
dosage form: IV, Dosage, frequency, and duration: According to local standard of care
Sponsors
University of Texas
Texas Tech University Health Sciences Center
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
FEMALE
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Females, age 18 years of age or older, of all racial and ethnic origins that are scheduled to receive the first cycle of a single intravenous dose of doxorubicin (30 minute infusion) and cylcophosphamide (30 minute infusion) as part of standard medical care for breast cancer. English and/or Spanish speaking participants are eligible to participate.
Exclusion criteria
* Pregnant or nursing or unwilling to use a reliable contraception method during the study. The effects of doxorubicin and cyclophosphamide on pregnancy are unknown. In addition, the metabolic changes that accompany pregnancy may alter the concentration-time profile of doxorubicin or cyclophosphamide, so that the pregnancy and post-partum state would be a confounding variable. * Participants unwilling to comply with study procedures. * CrCl \< 10 ml/min * Participants requiring peritoneal or hemodialysis * Serum bilirubin \> 1.19 mg/dL * Receipt of the following drugs that: a) Alter doxorubicin concentrations: carbamazepine, cyclosporine, fosphenytoin, paclitaxel, phenytoin, sorafenib, valspodar, verapamil; b) Alter cyclophosphamide concentrations: cyclosporine, nevirapine, ondansetron; c) All other drugs will be reviewed during screening of the patient
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Clearance (Cl) for Doxorubicin and Cyclophosphamide | 0-48 hours | Cyclophosphamide analysis was not possible due to rapid drug degradation |
Countries
United States
Participant flow
Participants by arm
| Arm | Count |
|---|---|
| Doxorubicin and Cyclophosphamide Doxorubicin: Dosed by the patient's treating physician according to local standard of care.
Cyclophosphamide: dosage form: IV, Dosage, frequency, and duration: According to local standard of care | 15 |
| Total | 15 |
Baseline characteristics
| Characteristic | Doxorubicin and Cyclophosphamide |
|---|---|
| Age, Categorical <=18 years | 0 Participants |
| Age, Categorical >=65 years | 1 Participants |
| Age, Categorical Between 18 and 65 years | 14 Participants |
| Ethnicity (NIH/OMB) Hispanic or Latino | 1 Participants |
| Ethnicity (NIH/OMB) Not Hispanic or Latino | 14 Participants |
| Ethnicity (NIH/OMB) Unknown or Not Reported | 0 Participants |
| Race (NIH/OMB) American Indian or Alaska Native | 0 Participants |
| Race (NIH/OMB) Asian | 0 Participants |
| Race (NIH/OMB) Black or African American | 6 Participants |
| Race (NIH/OMB) More than one race | 0 Participants |
| Race (NIH/OMB) Native Hawaiian or Other Pacific Islander | 0 Participants |
| Race (NIH/OMB) Unknown or Not Reported | 0 Participants |
| Race (NIH/OMB) White | 9 Participants |
| Region of Enrollment United States | 15 participants |
| Sex: Female, Male Female | 15 Participants |
| Sex: Female, Male Male | 0 Participants |
Adverse events
| Event type | EG000 affected / at risk |
|---|---|
| deaths Total, all-cause mortality | — / — |
| other Total, other adverse events | 0 / 15 |
| serious Total, serious adverse events | 0 / 15 |
Outcome results
Primary
Clearance (Cl) for Doxorubicin and Cyclophosphamide
Cyclophosphamide analysis was not possible due to rapid drug degradation
Time frame: 0-48 hours
| Arm | Measure | Value (MEDIAN) |
|---|---|---|
| Doxorubicin and Cyclophosphamide | Clearance (Cl) for Doxorubicin and Cyclophosphamide | 1.85 L/hr |