Combination of Serabelisib and Insulin Suppressing Diet in Subjects With Advanced Solid Tumors With PIK3CA Mutations

  • End date
    Nov 6, 2023
  • participants needed
  • sponsor
    Faeth Therapeutics
Updated on 6 June 2022


This study will evaluate the feasibility of optimizing the safety and tolerability of serabelisib when combined with an ISD with a goal of reducing side effects and enhancing anticancer activity.


Targeted anticancer drugs have side effects that often result in a poor quality of life, noncompliance, dose decreases, or discontinuation, all of which can affect efficacy. This study will evaluate the feasibility of optimizing the safety and tolerability of serabelisib when combined with an insulin suppressing diet with a goal of reducing side effects and enhancing anticancer activity.

Serabelisib is a small molecule with potent and selective inhibitory activity against the PI3K alpha isoform and has shown promising anticancer activity in preclinical models as a single agent. Preclinical studies have also shown that combining a phosphoinositide 3-kinase inhibition with an ISD resulted in improved efficacy in mouse tumor models as compared with PI3K inhibition alone.

Condition Advanced Solid Tumor, PIK3CA Mutation, PTEN Loss of Function Mutation
Treatment Serabelisib, Insulin Suppressing Diet
Clinical Study IdentifierNCT05300048
SponsorFaeth Therapeutics
Last Modified on6 June 2022


Yes No Not Sure

Inclusion Criteria

Able to provide written informed consent
Age ≥18 at Visit -1 (screening)
Histologically or cytologically confirmed recurrent solid tumors
Cohort 1: any extracranial solid tumor
Cohort 2: adenocarcinoma of the colon or rectum
Cohort 3: recurrent or persistent endometrial adenocarcinoma with the following histologic epithelial cell types: endometrioid adenocarcinoma, serous adenocarcinoma, undifferentiated carcinoma, clear cell adenocarcinoma, mixed epithelial carcinoma, adenocarcinoma not otherwise specified (N.O.S.), mucinous adenocarcinoma, squamous cell carcinoma, transitional cell carcinoma, and carcinosarcoma
Cohort 4: ovarian cancer primary tumor with ≥ 50% clear cell histomorphology or ovarian clear cell or ovarian endometrioid carcinoma
Tumor must harbor an activating mutation in the PIK3CA gene with or without PTEN loss
either previously documented or determined during screening
Fresh or archival tumor biopsy with sufficient material to be sent to the designated laboratory for PD analyses. If only slides are available, then a minimum of 15 slides is required and the tumor tissue must have been obtained within 12 months of screening
Cohort 1 - Dose Modification (subjects with any solid tumor): failed, were intolerant of, or ineligible for no more than 3 prior lines of systemic therapy (LOTs) for advanced/metastatic disease (American Joint Committee on Cancer [AJCC] stage III and IV) or refused standard of care therapy
Cohorts 2, 3, and 4 - Cohort Expansion: failed, were intolerant of, ineligible for, or have refused standard of care therapy for advanced/metastatic disease (AJCC stage III and
IV) and
Cohort 2 (subjects with colorectal cancer): Have failed no more than 2 prior LOT
Cohort 3 (subjects with endometrial cancer): Have no more than 2 prior LOT. Concurrent hormonal therapy is NOT allowed
Cohort 4 (subjects with ovarian clear cell or ovarian endometrioid carcinoma): Have no more than 1 prior LOT in a platinum resistant/platinum refractory setting. BRCA mutant subjects are excluded unless they have failed a previous LOT with a PARP inhibitor. (Note: a LOT is defined as having been administered in the metastatic/inoperable setting. Neoadjuvant or adjuvant therapies will not be counted as a LOT if administered ≥6 months ago.)
Life expectancy of at least 3 months
Documented radiographic progression since the last treatment was administered with at least one measurable lesion (as defined by RECIST 1.1). One of the lesions has to be in a location that allows for the on-study biopsy
Eastern Cooperative Oncology Group performance status (ECOG PS) of 0-1
Adequate organ function
Absolute neutrophil count (ANC) ≥1.0 × 109/L, platelet count ≥75 × 109/L, and hemoglobin ≥8.5 gm/dL (may be transfused to reach this Hb level unless due to blood loss)
Liver transaminases (aspartate aminotransferase [AST] and alanine aminotransferase [ALT]) ≤2.5 × upper limit of normal (ULN) (<5 × ULN if liver metastases are present), and total bilirubin ≤1.5 × ULN (<3 x ULN if subject has Gilbert Syndrome)
INR ≤1.5 x ULN unless subject is on anticoagulants that would affect the INR, then INR must be in the desired therapeutic range as judged by the investigator
Albumin level ≥3.5 mg/dL or ≥ the lower limit of normal
Renal: Serum creatinine ≤2 x ULN (or if higher than the normal range, calculated creatinine clearance [CrCl] must be ≥51 mL/min/1.73 m2 by body surface areamodified Cockcroft-Gault or other appropriate formula; actual body weight must be used for calculation of CrCl unless BMI is >30 kg/m2, in which case, lean body weight must be used)
Ability to take oral medication, be willing to adhere to study procedures and Study
Drug administration, and receive, consume, and comply with Study ISD
For women of childbearing potential (defined as a sexually mature woman who has not undergone hysterectomy or bilateral oophorectomy or has not been naturally postmenopausal for at least 24 consecutive months [i.e., has had menses at any time during the preceding 24 consecutive months]), a negative serum pregnancy test collected at screening (V-1) and negative urine pregnancy test collected at baseline (V0) and use of physician-approved method of birth control from the time of the pregnancy test performed at Screening to 90 days following the last administration of Study Drug
Male subjects must be surgically sterile or must agree to use physician-approved contraception during the study and for 90 days following the last administration of Study Drug

Exclusion Criteria

Diagnosis of primary brain tumor
Has had serabelisib, alpelisib, or other PIK3 kinase inhibitor
Leptomeningeal disease and symptomatic or untreated brain metastases. Subjects with treated (surgically excised or irradiated) and stable brain metastases are eligible, assuming adequate recovery from treatment to Grade 1 or less, the treatment was at least 28 days prior to first planned administration of Study Drug, and baseline brain computed tomography (CT) with contrast or magnetic resonance imaging (MRI) within 14 days of initiation of Study Drug, is negative for new or worsening brain metastases
Diagnosis of, or requiring treatment for, another malignancy within the past 2 years (excluding a history of carcinoma in situ of the cervix, superficial non-melanoma skin cancer, or superficial bladder cancer that has been adequately treated, or stage 1 prostate cancer that does not require treatment or requires only treatment with luteinizing hormone-releasing hormone agonists or antagonists if initiated at least 90 days prior to the first planned dose of Study Drug)
Is less than 21 days from therapeutic radiation or chemotherapy prior to the first planned day of dosing with Study Drug and has not recovered to Grade ≤ 1 (National Cancer Institute [NCI] Common Terminology Criteria for Adverse Events [CTCAE] v5.0, Appendix 5) from all clinically significant toxicities related to prior therapies
For subjects receiving nitrosoureas or mitomycin C, the subject is < 6 weeks from last dose. For monoclonal antibody therapy, the subject is < one half-life or <4 weeks from the last dose
Chronic, systemically administered glucocorticoids in doses equivalent to >5 mg prednisone daily. Topical, inhalational, ophthalmic, intraarticular, and intranasal glucocorticoids are permitted. Isolated or intermittent use of systemically administered glucocorticoids to treat complications of malignancy, use as a premedication, or as a one-time prep for an imaging procedure is permitted. If subject was on >5 mg prednisone/day equivalent, last dose must have been at least 7 days prior to the first planned dose of Study Drug. Replacement corticosteroids for adrenal insufficiency are permitted
Diabetes mellitus requiring insulin or insulin secretagogue therapy
Poorly controlled diabetes mellitus defined as glycosylated hemoglobin A1c (HbA1c) >7.5% or fasting blood sugar >160 mg/ dL
Known impaired cardiac function or clinically significant cardiac disease such as ventricular arrhythmia requiring therapy, congestive heart failure (New York Heart Association Class III or IV), and/or uncontrolled hypertension (defined as systolic blood pressure >150 mmHg and/or diastolic blood pressure >100 mmHg on antihypertensive medications)
Myocardial infarction, cardiac stent placement, or unstable angina within 6 months before the planned first administration of Study Drug
Have clinically significant peripheral vascular disease
Manifestations of malabsorption due to prior GI surgery, GI disease, or for an unknown reason that could alter the absorption of oral medications or Study ISD
Other clinically significant comorbidities, such as uncontrolled pulmonary disease, active central nervous system disease, active infection (any infection requiring systemic therapy), non-healing wounds or injuries, or any other condition that could compromise the subject's participation or confound the interpretation of compliance, adherence, safety, or efficacy results
Pregnant (positive serum pregnancy test), planning to become pregnant during the study, or breastfeeding/planning to breastfeed during the study
Have taken strong CYP3A4 inducers/inhibitors within 7 days before the first administration of serabelisib (See Section 12.2 for list of strong CYP3A4 inducers/inhibitors) or have conditions that require the concomitant use of CYP3A4 inducers/inhibitors
Untreated or poorly controlled, gastro-esophageal reflux disease
Have taken histamine-H2 receptor antagonists within 24 hours before the planned first administration of serabelisib
Have taken proton-pump inhibitors (PPI) within 7 days or 5 half-lives (whichever is the shorter duration) before the first planned administration of serabelisib or are anticipated to need PPI during the study
Have taken neutralizing antacids within 4 hours before the first planned administration of serabelisib or are anticipated to need frequent antacid use during the study
Known to be positive for Human Immunodeficiency Virus, Hepatitis B, or Hepatitis C
Known allergies to serabelisib excipients or the ISD
Serabelisib excipients: microcrystalline cellulose, low substituted hydroxypropyl cellulose, croscarmellose sodium, colloidal silicon dioxide, and magnesium stearate (non-bovine)
ISD allergens: milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, and soybeans
Severe, uncontrolled gout
A BMI <20 kg/m2, or serious or refractive cachexia or anorexia that, in the investigator's opinion, realistically prohibits subjects from having energy or appetite sufficient to reliably engage in a strict medical food regimen for an extended time
Any condition that renders the subject unable to satisfactorily chew, swallow, digest, or tolerate (i.e., persistent diarrhea) the majority of foods and liquids of the Study ISD
History of severe nephrolithiasis requiring urologic intervention
Participation in a diet (Atkins, Weight Watchers, Best Life, Nutrisystem, South Beach, Jenny Craig, Paleo Diet, Zone, etc.) or weight loss plan within 10 days prior to the planned first administration of Study Drug
Severe constipation or condition where exacerbation of constipation is not advisable (eg, small bowel obstruction history)
History of anaphylaxis from food allergy or other disease state requiring avoidance of a particular food, such as celiac disease
Diagnosed eating disorder in the past 10 years
Unwilling to take a non-vegan or non-vegetarian diet
Clear my responses

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