A First-in-Human Phase I Study of Subcutaneous Outpatient Recombinant Human IL15 (rhIL15) in Adults with Advanced Solid Tumors

作者：Miller Jeffrey S.; Morishima Chihiro; McNeel Douglas G.; Patel Manish R.; Kohrt Holbrook E. K.; Thompson John A.; Sondel Paul M.; Wakelee Heather A.; Disis Mary L.; Kaiser Judith C.; Cheever Martin A.; Streicher Howard; Creekmore Steven P.; Waldmann Thomas A.; Conlon Kevin C.

来源：Clinical Cancer Research, 2018, 24(7): 1525-1535.

DOI：10.1158/1078-0432.CCR-17-2451

Purpose: Preclinical data established IL15 as a homeostatic factor and powerful stimulator of NK and CD8thorn T-cell function, the basis for clinical testing.
Experimental Design: Afirst-in-human outpatient phase I dose escalation trial of subcutaneous (SC) rhIL15 was conducted in refractory solid tumor cancer patients. Therapy consisted of daily (Monday-Friday) subcutaneous injections of rhIL15 for two consecutive weeks (10 total doses/cycle). Clinical response was assessed by RECIST. Pharmacokinetics of rhIL15 and immune biomarkers were evaluated.
Results: Nineteen patients were treated with rhIL15 at dose levels of 0.25, 0.5, 1, 2, and 3 mcg/kg/day. Fourteen patients completed >= 2 cycles of therapy that was well tolerated. One serious adverse event (SAE), grade 2 pancreatitis, required overnight hospitalization. Enrollment was halted after a patient receiving 3 mcg/kg/day developed a dose-limiting SAE of grade 3 cardiac chest pain associated with hypotension and increased troponin. No objective responses were observed; however, several patients had disease stabilization including a renal cell carcinoma patient who continued protocol treatment for 2 years. The treatment induced profound expansion of circulating NK cells, especially among the CD56(bright) subset. A proportional but less dramatic increase was found among circulating CD8(+) T cells with maximal 3-fold expansion for the 2 and 3 mcg/kg patients.
Conclusions: SC rhIL15 treatment was well tolerated, producing substantial increases in circulating NK and CD8(+) T cells. This protocol establishes a safe outpatient SC rhIL15 regimen of 2 mcg/kg/day dosing amenable to self-injection and with potential as a combination immunotherapeutic agent.

• 出版日期2018-4-1