The purpose of a phase Ib study is to find out the best or maximum tolerated dose of a
medication or combination of medications. Therefore, the purpose of this study is to decide
the best dose of the study drug, Debio 1347, that can be given in combination with the
standard hormonal drug, fulvestrant. Debio 1347 and fulvestrant could shrink the cancer but
it could also cause side effects. This study tells us about the side effects of these drugs
when given in this new combination, and how often they occur.
- Age > 18 years
- Written informed consent and authorization obtained from the subject/HIPAAappointed
legal representative prior to performing any protocol-related procedures including
- Postmenopausal female patients with metastatic histologically or cytologically
confirmed invasive breast cancer. Pre or perimenopausal women allowed with the
addition of goserelin.
- Postmenopausal status will be defined as following:
- Age ≥ 60 years
- Age < 60 years and 12 months of amenorrhea plus follicle stimulating hormone and
plasma estradiol levels within postmenopausal range by local laboratory
assessment in the absence of oral contraceptive pills, hormone replacement
therapy, or gonadotropin-releasing hormone (GnRH) agonist or antagonist
- Prior bilateral oophorectomy
- ECOG performance status 0 -1
- Tumor must be estrogen receptor and/or progesterone receptor positive ( i.e Hormone
receptor positive (HR+) and HER-2 negative as defined by the ASCO-CAP guidelines: HR+
is defined as expression of ER and/PR in ≥ 1% of cells, or HR+ by local laboratory or
regional definition. HER2− is defined as a HER2 IHC score of 0 or 1+ , or an IHC score
of 2+ accompanied by a negative fluorescence, chromogenic, or silver in situ
hybridization test indicating the absence of HER2 gene amplification, or a HER2/CEP17
ratio of < 2.0, or local clinical guidelines.
- Tumors must have FGFR amplifications as determined by MSK-IMPACT assay. Patients with
FGFR amplifications co-occurring with 11q amplification (CCND1, FGF3,4, 19
amplifications) are also eligible.
- Measurable or evaluable disease per RECIST1.1 or pure lytic or mixed lytic-blastic
- No more than 1 prior chemotherapy regimen in the metastatic setting for the phase 2
portion. Patients in the phase 1 portion could have received any number of prior lines
- Willing to undergo a new core or excisional biopsy from a metastatic, not previously
irradiated tumor lesion during screening
- Life expectancy of greater than 3 months
- Archival Tumor (up to 10 unstained slides) will be obtained, whenever available for
additional biomarker analyses
- Hematologic parameters:
- White blood cell (WBC) count of > 3000/ul
- Absolute neutrophil count (ANC) > 1000/ul
- Platelets > 100,000/ul, hemoglobin > 9.0 g/dl
- Non-hematologic parameters:
- Total bilirubin ≤1.5 x ULN (upper limit of normal) except subject with documented
Gilbert‟s syndrome (≤5 x ULN) or liver metastasis, who must have a baseline total
bilirubin ≤3.0 mg/dL
- AST and ALT ≤ 3 x ULN, unless associated with hepatobiliary metastases, in that
case ≤5 x ULN
- Serum creatinine ≤ 1.5 × ULN or creatinine clearance ≥ 50 mL/min on the basis of
Cockcroft−Gault glomerular filtration rate estimation:
(140 − age) × (weight in kg) × (0.85 if female) 72 × (serum creatinine in mg/dL)
- Patients with "treated and stable" brain lesions of a duration of > 4 weeks may be
- Female subjects of childbearing potential should have a negative urine or serum
pregnancy test within 72 hours prior to receiving the first dose of study medication
and agree to use effective contraception. If the urine test is positive or cannot be
confirmed as negative, a serum pregnancy test will be required. Note: Abstinence is
acceptable if this is the usual lifestyle and preferred contraception for the subject.
- Prior Fulvestrant for metastatic breast cancer will be allowed for phase 1 portion but
not for the phase 2 portion
- History of hypersensitivity to any of the excipients in the Debio 1347 formulation
(lactose hydrate, microcrystalline cellulose, croscarmellose sodium, hydroxypropyl
cellulose, sodium lauryl sulfate, and magnesium stearate).
- Other malignancies requiring active treatment in the last 6 months.
- Brain tumors and/or brain metastases unless they are asymptomatic, stable on recent
imaging (not dated more than 30 days from the inclusion date), and have not required
active treatment in the last 6 months.
- History and/or current evidence of endocrine alteration of calcium-phosphate
- History of myocardial infarction or stroke within 6 months, congestive heart failure
greater than NYHA class II, unstable angina pectoris, unexplained recurrent syncope,
cardiac arrhythmia requiring treatment or family history of sudden death from
- Baseline Frederica‟s corrected QT (QTcF) interval greater than 470 msec (female) or
greater than 450 msec (male), history of congenital long QT syndrome, the presence in
the screening ECG of a conduction abnormality that in the opinion of the Investigator
would preclude safe participation in this study.
- Concomitant use of a drug with a known risk of QTc prolongation
- Current anticoagulation therapy with therapeutic doses of warfarin (low-dose warfarin
≤ 1mg/day or low molecular-weight heparin are permitted).
- History and or current evidence of ectopic mineralisation/calcification including but
not limited to the soft tissue, kidneys, intestine, myocardium and lung with the
exception of calcified lymph nodes and asymptomatic coronary calcification.
- Concomitant use of high dose systemic steroids and other drugs such as calcitonin
preparations, active Vitamin D3 preparations, estrogen preparations, selective
estrogen receptor modulators, Vitamin K2 preparations, parathyroid hormones,
phosphorus absorbers. Note, inhaled, topical steroids and low tapering doses of
steroid especially in patients treated recently for brain metastases will be included.
- Corneal disease, such as bullous or band keratopathy, corneal desquamation, keratitis,
corneal ulcer, or keratoconjunctivitis.
- Known infection requiring the systemic use of, for example, an antibiotic or antiviral
- Known HIV, HBV or HCV infection.
- Known untreated or uncontrolled acute infection, including urinary tract infection,
within 7 days of study entry.
- History of organ, bone marrow, or stem cell transplantation.
- Pregnant or lactating woman with positive pregnancy test result within 7 days of
starting study treatment (any woman of childbearing potential who has menstruated
within the year prior to enrolment will undergo pregnancy testing).
- Women of childbearing potential or men who is unwilling to use an appropriate method
of contraception during the study period and for 6 months after completing treatment
with Debio 1347. Oral or injectable contraceptive agents cannot be the sole method of
- Poorly controlled diabetes mellitus or hypertension (e.g., systolic > 180 mmHg or
diastolic > 100 mmHg).
- Inability or unwillingness to swallow oral medications.
- Clinically significant gastrointestinal abnormality that would affect the absorption
of drug such as gastrointestinal dysfunction, malabsorption syndrome, major resection
of the small bowel or total gastrectomy or inflammatory bowel disease.
- Uncontrolled hydropericardium.
- Chemotherapy or radiotherapy within 14 days prior to starting study treatment. In case
of monoclonal antibodies/biologics, within 28 days prior to starting study treatment.
- Administration of investigational agents within 28 days prior to treatment initiation.
- Major surgery and surgery for brain metastases within 28 days prior to screening
start. Of note, Intravenous port placement is not considered as a major surgery.
- Not recovered from AEs or toxicities due to previous treatments to a Grade 1 or less
specified in NCI-CTCAE version 4.0 excepting, albumin (< 2.5 g/dL), AST and ALT in
patients with liver metastases (> 5 × ULN) ALP in patients with bone metastases (> 5 ×
ULN) and alopecia.
- Prior use of a drug targeting FGF or FGFR. Patients previously treated with
medications that affect FGFR signaling as a secondary target (e.g., multi-tyrosine
kinase inhibitors that primarily inhibit VEGF, but to a lesser extent also affect FGFR
signaling) can be considered after discussion with the Medical Monitor.
- Currently under alcohol or drug abuse rehabilitation or treatment program.
- Uncontrolled intercurrent illness or psychiatric illness/social situations that would
limit compliance with study requirements.
Eligibility Note: Patients could have progressed on prior aromatase inhibitors