Study to Evaluate the Efficacy and Safety of CUDC-907 in Patients With RR DLBCL, Including Patients With MYC Alterations

Patients with RR DLBCL will be eligible for treatment with CUDC-907, as long as they have
tumor tissue available that can be tested for MYC-altered disease based on one of the
following:

- Fresh tumor tissue obtained from biopsy accessible lesions , or

- Archived tumor tissue (most recent available)

Subjects will be required to submit archival tumor samples (most recent available) or fresh
tumor samples for central FISH and IHC testing. Subjects whose tumors have been previously
characterized as MYC-altered are strongly encouraged to enter the study. For subjects who
enter the study with unconfirmed MYC-altered disease, fresh tumor samples are preferred.

Inclusion Criteria:

1. Age ≥ 18 years.

2. At least 2 but no more than 4 prior lines of therapy for the treatment of de novo
DLBCL and ineligible for (or failed) autologous or allogeneic stem cell transplant
(SCT) (salvage therapy, conditioning therapy and maintenance with transplant will be
considered one prior treatment). NOTE: For follicular lymphoma transformed to DLBCL
(t-FL/DLBCL), single agent non-cytotoxic therapy will not be considered as a line of
therapy.

3. Histopathologically confirmed diagnosis of one of the following:

- RR DLBCL per the 2008 World Health Organization (WHO) classification of
hematopoietic and lymphoid tumors (Swerdlow et al, 2008).

- High grade B-cell lymphoma (HGBL), with MYC and BCL2 and/or BCL6 rearrangements
or DLBCL, NOS per the 2016 revision of the WHO classification of lymphoid
neoplasms (Swerdlow et al, 2016).

- Diagnosis of t-FL/DLBCL is allowed. However, other B-cell lymphomas including
other transformed indolent lymphomas/DLBCL per the 2008 WHO classification, and
Burkitt lymphoma are not eligible.

Exclusion Criteria:

1. Known primary mediastinal, ocular, epidural, testicular or breast DLBCL.

2. Active CNS involvement of their malignancy.

3. Known allergy or hypersensitivity to phosphatidylinositol 3 kinase (PI3K) inhibitors
or any component of the formulations used in this study.

4. Cytotoxic anticancer therapy (e.g., alkylating agents, anti-metabolites, purine
analogues) or any other systemic anticancer therapy within 2 weeks of study entry.

5. Radiotherapy delivered to non-target lesions within one week prior to starting study
treatment or delivered to target lesions that will be followed on the study (note:
prior sites of radiation will be recorded).

6. Treatment with experimental therapy within 5 terminal half-lives (t1/2) or 4 weeks
prior to enrollment, whichever is longer.

7. Current or planned glucocorticoid therapy, with the following exceptions:

- Doses ≤ 10 mg/kg/day prednisolone or equivalent is allowed, provided that the
steroid dose has been stable or tapering for at least 14 days prior to the first
dose of CUDC-907.

- Inhaled, intranasal, intraarticular, and topical steroids are permitted.