This is a global, multicenter Phase 1/3 study to evaluate the efficacy and safety of
selinexor plus ruxolitinib in JAK inhibitor (JAKi) treatment-nave myelofibrosis (MF)
participants. The study will be conducted in two phases: Phase 1 (open-label) and Phase 3
(double-blind). Phase 1 (enrollment completed) was an open-label evaluation of the safety and
recommended dose (RD) of selinexor in combination with ruxolitinib and included a dose
escalation using a standard 3+3 design (Phase 1a) and a dose expansion part (Phase 1b). In
Phase 3, JAKi treatment-nave MF participants are enrolled in 2:1 ratio to receive the
combination therapy of selinexor + ruxolitinib or the combination of placebo + ruxolitinib.

The purpose of this study is to evaluate the safety and tolerability of AB521 when taken
alone in participants with advanced solid tumor malignancies and clear cell renal cell
carcinoma (ccRCC).

This is an umbrella study evaluating the efficacy and safety of multiple treatment
combinations in participants with metastatic or inoperable locally advanced breast cancer.

The study will be performed in two stages. During Stage 1, four cohorts will be enrolled in
parallel in this study:

Cohort 1 will consist of Programmed death-ligand 1 (PD-L1)-positive participants who have
received no prior systemic therapy for metastatic or inoperable locally advanced
triple-negative breast cancer (TNBC) (first-line [1L] PD-L1+ cohort).

Cohort 2 will consist of participants who had disease progression during or following 1L
treatment with chemotherapy for metastatic or inoperable locally-advanced TNBC and have not
received cancer immunotherapy (CIT) (second-line [2L] CIT-naive cohort).

Cohort 3 will consist of participants with locally-advanced or metastatic HR+, HER2-negative
disease with PIK3CA mutation who may or may not have had disease progression during or
following previous lines of treatment for metastatic disease (HR+cohort).

Cohort 4 will consist of participants with locally-advanced or metastatic HER2+ /HER2-low
disease with PIK3CA mutation who had disease progression on standard-of-care therapies (HER2+
/HER2-low cohort).

In each cohort, eligible participants will initially be assigned to one of several treatment
arms (Stage 1). In addition, participants in the 2L CIT-nave cohort who experience disease
progression, loss of clinical benefit, or unacceptable toxicity during Stage 1 may be
eligible to continue treatment with a different treatment combination (Stage 2), provided
Stage 2 is open for enrollment.

This is a Phase 1/2, open-label, non-randomized, 4-part Phase 1 trial to determine the safety
profile and identify the maximum tolerated dose (MTD) and/or recommended Phase 2 dose (RP2D)
of INBRX 106 administered as a single agent or in combination with the anti-PD-1 checkpoint
inhibitor (CPI) pembrolizumab (Keytruda).

RBS2418 (investigational product) is a specific immune modulator, working through
ectonucleotide pyrophosphatase/phosphodiesterase I (ENPP1), designed to lead to anti-tumor
immunity by increasing endogenous 2'-3'-cyclic guanosine monophosphate-adenosine
monophosphate (cGAMP) and adenosine triphosphate (ATP levels) and reducing adenosine
production in the tumors. RBS2418 has the potential to be an important therapeutic option for
subjects both as monotherapy and in combination with checkpoint blockade. This study is an
open-label, multi-site Phase 1a/1b study of RBS2418, a selective ENPP1 inhibitor, in
combination with pembrolizumab or as a monotherapy in subjects with advanced unresectable,
recurrent or metastatic tumors.