In:
Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 31, No. 15_suppl ( 2013-05-20), p. 10588-10588
Abstract:
10588 Background: Kaposi sarcoma (KS) is a multifocal angioproliferative disorder. VEGFR2-3, PDGFR and c-kit are implicated in KS pathogenesis and inhibited by sorafenib (So). KS is commonly HIV-associated. The antiretroviral drug ritonavir (R) inhibits CYP3A4, and may affect So metabolism and tolerability. Methods: We performed a phase I study of So in KS. HIV+ patients (pts) were eligible if on combination antiretroviral therapy (cART) for 〉 3 months with progressive KS or 〉 4 months with no KS regression. Dose level 1 for pts on R-containing cART (R1) was So 200 mg daily, for pts not receiving R (NR1) So 200 mg every 12 hours. Treatment cycles were 21 days. So pharmacokinetic assessment performed cycle 1 day 8. Adverse event (AE) grade (Gr) by CTCAE v3.0 (2006-10) and v4.0 (2011-12). KS response graded by modified ACTG criteria. Results: 10 pts, R1 (8), NR1 (2). Baseline characteristics: median (med) (range) age 49 (35-72), CD4 in HIV+ 500 cells/uL (35, 747), time on cART 9 months (3.5, 27), previous KS therapies 2 (0-5). 9 HIV-infected, 8/9 HIV viral load 〈 50 copies/mL. 6 had KS-associated edema. Med number cycles 4 (1, 13). Common AE at least possibly attributable to So: anemia, AST/ALT elevation, lipase elevation, hypertension, proteinuria, fatigue, infection, voice alteration. Dose-limiting toxicities (DLT): R1- Gr3 asymptomatic elevated lipase (1), Gr4 thrombocytopenia (1, likely due to multicentric Castleman disease); NR1- Gr3 hand-foot syndrome not resolved by week 6 (1). Other Gr 3-4 AE: R1- hand-foot syndrome (1), Gr3 thrombocytopenia (1), Gr3 transient cerebral ischemia (1), Gr3 hypertension (1); NR1- Gr3 hypertension (2). Best response: partial response (PR) (2), stable disease (SD)(5), progressive disease (1), not evaluable (2). Med duration SD 12 weeks (5, 33). 5/6 with KS-associated edema had objective decrease in edema. R was not associated with clear difference in So C Max or AUC at steady state. Conclusions: Preliminary estimate of PR or better is 20%. Even in some cases where KS did not respond, KS-associated edema improved. However, So was relatively poorly tolerated, with DLT observed at R1 and NR1, and these doses did not yield better responses than established therapies. Additional studies evaluating R’s effect on So metabolites are warranted. Clinical trial information: NCT00287495.
Type of Medium:
Online Resource
ISSN:
0732-183X
,
1527-7755
DOI:
10.1200/jco.2013.31.15_suppl.10588
Language:
English
Publisher:
American Society of Clinical Oncology (ASCO)
Publication Date:
2013
detail.hit.zdb_id:
2005181-5
Permalink