Breast Capsular Contracture Following Post-Mastectomy Reconstruction in Women Treated With the Leukotriene Inhibitor Zafirlukast: A Phase II Trial

Phase 2

Terminated

Conditions: Breast Cancer

Interventions: Other: Standard of Care (no intervention)
Drug: zafirlukast

Registration Number: NCT02950480

Lead Sponsor: University of California, San Francisco

Brief Summary: A 2 arm, 90 patient (45 per cohort) trial in patients with breast cancer who will be undergoing mastectomy with immediate tissue-expander reconstruction to determine whether treatment with zafirlukast (20mg PO BID) can reduce or prevent the development of capsular contracture.

Detailed Description: A 2 arm, 90 patient (45 per cohort) trial in patients with breast cancer who will be undergoing mastectomy with immediate tissue-expander reconstruction to determine whether treatment with zafirlukast (20mg PO BID) can reduce or prevent the development of capsular contracture.

Patients will be block randomized 1:1 into two cohorts: treatment with zafirlukast and the standard of care, or standard of care alone. Patients will begin treatment with zafirlukast on post-operative day one following placement of tissue expander(s) once determined safe from a surgical recovery standpoint. They will be continued on the standard dosing (20mg PO twice per day) of zafirlukast through expander fill (6-12 weeks, up to 18 weeks for women receiving radiation). Treatment will be stopped 48 hours prior to expander-implant exchange, which is equivalent to 5 half-lives of the drug. Patients will be seen every 1-2 weeks for expander fill, and will be assessed clinically based on the Baker classification system of capsular contracture at every appointment. The day of surgery for their expander-implant exchange, their Baker classification will also be noted.

During expander-implant exchange, three representative sections of the expander capsule will be collected: medial, lateral and anterior capsule specimens. These specimens will be bisected; half will be sent to pathology and half will be collected by the Munster lab. Gross and microscopic determination of capsule thickness will be performed by the pathology department. The Munster lab will fix and stain the tissues to look for the presence of collagen, level of fibrosis and number of myofibroblasts. Fibrosis level and collagen presence will be determined by performing immunohistochemistry with a Trichrome stain of the tissues, as well as Western blot analysis with Collagen-1. Myofibroblasts will be detected using immunohistochemistry with commercially available antibodies.

Recruitment & Eligibility

Status: TERMINATED

Sex: Female

Target Recruitment: 4

Inclusion Criteria

Patients who are scheduled to undergo therapeutic or prophylactic mastectomy with immediate placement of tissue expanders and have a strong family history or hereditary cancer
Age ≥ 18 years
Zafirlukast is pregnancy category B. There are no adequate and well-controlled trials in pregnant women. Therefore, the effects of zafirlukast on the developing human fetus are unknown. For this reason, women of child-bearing potential must agree to use adequate contraception: 2 methods of birth control, prior to study entry ad for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while she is participating in this study, she should inform her treating physician immediately.
Ability to understand a written informed consent document, and the willingness to sign it
At least 4 weeks post-completion of chemotherapy
Adequate organ function within 14 days start of study start:
1. Absolute neutrophil count (ANC) ≥ 1.5 X 10^9/L
2. Hemoglobin (Hgb) ≥9g/dL
3. Platelets (plt) ≥ 100 x 10^9/L
4. Potassium within normal range, or correctable with supplements;
5. AST and ALT ≤2.5 x Upper Limit Normal (ULN) or ≤5.0 x ULN if liver tumor is present;
6. Serum total bilirubin ≤ 1.5 x ULN
7. Serum creatinine ≤ 1.5 x ULN, or 24-hr clearance ≥ 60ml/min

Exclusion Criteria

Any significant medical condition, laboratory abnormalities, which places the subject at unacceptable risk if he/she were to participate in the study
Currently on a leukotriene inhibitor or used within the past 6 months
Prior chest wall radiation
Pregnant or breastfeeding
Hepatic impairment as defined by:

• AST(SGOT) > 2.5X institutional ULN and ALT(SGPT) > 2.5X institutional ULN
Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial.

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Standard of Care (no intervention)	Standard of Care (no intervention)	Standard of Care (no intervention)
Zafirlukast	zafirlukast	Zafirlukast

Primary Outcome Measures

Name	Time	Method
Capsular Thickness	Day 44 to Day 126	Compare capsular thickness by gross and microscopic measurement at the time of expander-implant exchange in those treated with zafirlukast (20 mg PO BID) compared with standard of care.

Secondary Outcome Measures

Name	Time	Method
Histologic Analysis: Compare Capsular Thickness by Gross and Microscopic Measurement at the Time of Expander-implant Exchange in Those Treated With Zafirlukast (20 mg PO BID) Compared With Standard of Care	Day 44 to Day 126	Perform histologic analysis of the capsule specimens to compare overall fibrosis and collagen deposition between the zafirlukast and standard of care groups. During expander-implant exchange, three representative sections of the expander capsule will be collected: medial, lateral and anterior capsule specimens. Gross and microscopic determination of capsule thickness will be performed by the pathology department. The Munster lab will fix and stain the tissues to look for the presence of collagen, level of fibrosis, and number of myofibroblasts. Fibrosis level and collagen presence will be determined by performing immunohistochemistry with a Trichrome stain of the tissues, as well as Western blot analysis with Collagen-1. Myofibroblasts will be detected using immunohistochemistry with commercially available antibodies.
Appearance of Capsular Contracture	After Day 44 to Day 126	The capsule tissue that is removed at the time of expander-implant exchange will be fixed and histologically assessed for the presence of fibroblasts and myofibroblasts.