Existence of solutions for integral boundary value problems of singular Hadamard-type fractional differential equations on infinite interval
ADVANCES IN DIFFERENCE EQUATIONS
Authors: Liu, Weiwei; Liu, Lishan; Wu, Yonghong
Abstract
We consider the existence of solutions for the following Hadamard-type fractional differential equations:
{Dalpha Hu(t)+q(t)f(t,u(t),HD beta 1u(t),HD beta 2u(t))=0,1u(1)=0,Dalpha -2Hu(1)=integral 1+infinityg1(s)u(s)dss,Dalpha -1Hu(+infinity)=integral 1+infinityg2(s)u(s)dss,![]()
where 2<
<= 3, 0<1 <= alpha -2<2 <= alpha -1, f:JxR3 -> R satisfies the q-Caratheodory condition, q,g1,g2:J -> R+ are nonnegative, where J=[1,+infinity). Nonlinear term f is dependent on the fractional derivative of lower order beta 1, beta 2, which creates additional complexity to verify the existence of solutions. The singularity occurring in our problem is associated with Dbeta 2Hu is an element of C(1,+infinity) at the left endpoint t=1 (if beta 2<-1).
TBCRC 032 IB/II Multicenter Study: Molecular Insights to AR Antagonist and PI3K Inhibitor Efficacy in Patients with AR(+) Metastatic Triple-Negative Breast Cancer
CLINICAL CANCER RESEARCH
Authors: Lehmann, Brian D.; Abramson, Vandana G.; Sanders, Melinda E.; Mayer, Erica L.; Haddad, Tufia C.; Nanda, Rita; Van Poznak, Catherine; Storniolo, Anna Maria; Nangia, Julie R.; Gonzalez-Ericsson, Paula I.; Sanchez, Violeta; Johnson, Kimberly N.; Abramson, Richard G.; Chen, Sheau-Chiann; Shyr, Yu; Arteaga, Carlos L.; Wolff, Antonio C.; Pietenpol, Jennifer A.
Abstract
Purpose: Preclinical data demonstrating androgen receptor (AR)-positive (AR(+)) triple-negative breast cancer (TNBC) cells are sensitive to AR antagonists, and PI3K inhibition catalyzed an investigator-initiated, multi-institutional phase Ib/II study TBCRC032. The trial investigated the safety and efficacy of the AR-antagonist enzalutamide alone or in combination with the PI3K inhibitor taselisib in patients with metastatic AR(+) (>= 10%) breast cancer. Patients and Methods: Phase Ib patients [estrogen receptor positive (ER+) or TNBC] with AR(+) breast cancer received 160 mg enzalutamide in combination with taselisib to determine dose-limiting toxicities and the maximum tolerated dose (MTD). Phase II TNBC patients were randomized to receive either enzalutamide alone or in combination with 4 mg taselisib until disease progression. Primary endpoint was clinical benefit rate (CBR) at 16 weeks. Results: The combination was tolerated, and the MTD was not reached. The adverse events were hyperglycemia and skin rash. Overall, CBR for evaluable patients receiving the combination was 35.7%, and median progression-free survival (PFS) was 3.4 months. Luminal AR (LAR) TNBC subtype patients trended toward better response compared with non-LAR (75.0% vs. 12.5%, P = 0.06), and increased PFS (4.6 vs. 2.0 months, P = 0.082). Genomic analyses revealed subtype-specific treatment response, and novel FGFR2 fusions and AR splice variants. Conclusions: The combination of enzalutamide and taselisib increased CBR in TNBC patients with AR(+) tumors. Correlative analyses suggest AR protein expression alone is insufficient for identifying patients with AR-dependent tumors and knowledge of tumor LAR subtype and AR splice variants may identify patients more or less likely to benefit from AR antagonists.