The primary objective of this study is to characterize the metabolic disposition, pharmacokinetics (PK), and routes of elimination of [14C]-labeled BVD-523 after administration of a single, oral dose to healthy male subjects.

The secondary objective of this study is to evaluate the safety and tolerability of a single oral dose of [14C]-labeled BVD-523 in healthy male subjects.

This study will be an open-label, absorption, metabolism, and excretion study of [14C]-BVD-523 administered as a 600-mg (approximately 200 µCi) oral dose to 6 healthy male subjects following a 2-hour fast from food (not including water) that follows breakfast.

Inclusion Criteria:

• Males, between 18 and 65 years of age, inclusive, at Screening
• Have a body mass index range of 18.5 to 32.0 kg/m2, inclusive, at Screening
• In good health, determined by no clinically significant findings from medical history, 12-lead ECG, and vital signs measurements at Screening or Check-in and PE findings at Check-in as determined by the Investigator (or designee)
• Clinical laboratory evaluations (including clinical chemistry panel [fasted at least 8 hours], hematology/complete blood count [CBC], and urinalysis [UA] within the reference range for the test laboratory at Screening and Check-in, unless deemed not clinically significant by the Investigator (or designee)
• Negative test for selected drugs of abuse and cotinine at Screening (does not include alcohol) and at Check-in (does include alcohol)
• Negative hepatitis panel (including hepatitis B surface antigen and hepatitis C virus antibody) and negative human immunodeficiency virus (HIV) antibody screens at Screening
• Males will be surgically sterile for at least 90 days (confirmed by documented azoospermia) or, when sexually-active with female partners of child-bearing potential, will agree to use contraception as detailed in Section 6.3.3 from Check-in until 90 days following Discharge
• Males must be willing to refrain from sperm donation from Check-in to 90 days from day of dosing
• Able to comprehend and willing to sign an ICF
• A minimum of 1 bowel movement per day.

Exclusion Criteria:

• Significant history or clinical manifestation of any metabolic, allergic, infectious, dermatological, hepatic, renal, hematological, pulmonary, cardiovascular, gastrointestinal, neurological, or psychiatric disorder (as determined by the Investigator [or designee]) prior to Check-in
• History of significant hypersensitivity, intolerance, or allergy to any drug compound, food, or other substance, unless approved by the Investigator (or designee) prior to Check-in
• History of stomach or intestinal surgery or resection that could alter absorption or excretion of orally administered drugs prior to Check-in except appendectomy, and hernia repair will be allowed if it was not associated with;
• History of Gilbert's Syndrome
• History or presence of an abnormal ECG that, in the Investigator's (or designee's) opinion, is clinically significant
• History of alcoholism or drug addiction within 1 year prior to Check-in
• History of nicotine use within 6 months prior to Check-in or positive cotinine at Screening or Check-in
• Participation in more than 1 other radiolabeled investigational study drug trial within 12 months prior to Check-in. The previous radiolabeled study drug must have been received more than 6 months prior to Check-in for this study and the total exposure from this study and the previous study will be within the recommended levels considered safe, per United States (US) Title 21 Code of Federal Regulations (CFR) 361.1 (eg, less than 3,000 mrem whole body annual exposure)
• Exposure to significant radiation (eg, serial x-ray or computed tomography scans, barium meal, current employment in a job requiring radiation exposure monitoring) within 12 months prior to Check-in
• Use of any drugs or substances known to be strong inhibitors or strong inducers of CYP3A enzyme within 30 days prior to study drug administration, unless otherwise stated, and throughout the study
• Participation in any other investigational study drug trial in which receipt of an investigational study drug occurred within 5 half-lives (if known) or 30 days prior to Check-in, whichever is longer
• Use of any prescription medications/products within 14 days prior to Check-in, unless deemed acceptable by the Investigator (or designee)
• Use of any over-the-counter, nonprescription preparations (including vitamins, minerals, and phytotherapeutic/herbal/plant-derived preparations) within 7 days prior to Check-in, unless deemed acceptable by the Investigator (or designee)
• Poor peripheral venous access prior to Check-in
• Donation of whole blood from 56 days prior to Screening through Discharge, inclusive, or of plasma from 30 days prior to Screening through Discharge, inclusive
• Receipt of blood products within 2 months prior to Check-in
• Any acute or chronic condition that, in the opinion of the Investigator (or designee), would limit the subject's ability to complete or participate in this clinical study
• Any other unspecified reason that, in the opinion of the Investigator (or designee) or Sponsor, make the subject unsuitable for enrollment

27 days

Adverse event definitions; assignment of severity, causality, action taken, and outcome; and procedures for reporting serious AEs (SAEs) are detailed in Appendix C of the protocol. None of the definitions differ from the clinicaltrials.gov definitions.