In Vivo Pharmacology Sr. Associate Scientist
- United States - Washington – Bothell
Job Description: Senior Associate Scientist – In Vivo Pharmacology
Location: Bothell, WA
Organization: Oncology Research Unit (ORU) – In Vivo Pharmacology
Position Type: Full‑time
Career Level: Senior Associate Scientist (Non‑PhD track)
Position Summary
The Oncology Research Unit (ORU) is seeking a hands-on, execution focused Senior Associate Scientist to join the In Vivo Pharmacology group at the Bothell, WA site. This role is primarily responsible for the execution of in vivo experiments supporting preclinical oncology drug discovery programs, including antibody drug conjugates (ADCs).
The Senior Associate Scientist will perform in vivo efficacy, PK/PD, and mechanistic studies, along with in vitro aseptic mammalian tissue culture, generating high quality data that supports project progression. This position is highly lab based and operates within a collaborative research environment where technical rigor, reproducibility, and compliance are critical.
Key Responsibilities
In Vivo Study Execution (Primary Focus)
Execute in vivo pharmacology studies to assess anti‑tumor efficacy, dose response, PK/PD relationships, and mechanism of action.
Perform routine and advanced in vivo dosing techniques (IV, IP, SC, PO) in tumor bearing mice.
Conduct tumor measurements, clinical observations, necropsy support, and biological sample collection (blood, plasma, tumors, tissues).
Utilize a variety of oncology models, including CDX, PDX, syngeneic, GEMM, and humanized mouse models.
Aseptic Technique & Mammalian Tissue Culture
Perform aseptic mammalian tissue culture to support in vivo studies, including cell expansion, maintenance, and preparation for tumor implantation.
Generate high‑quality cell preparations for in vivo tumor model establishment.
Apply strict aseptic technique to ensure sterility, reproducibility, and experimental integrity.
Maintain cell culture documentation, inventory, and quality control records.
Data Handling & Team Communication
Document and maintain accurate and compliant electronic laboratory notebooks and experimental records in accordance with IACUC regulations and Pfizer standards.
Compile, organize, and summarize experimental data for internal reports and presentations.
Communicate results clearly during project and group meetings.
Support multiple concurrent studies by managing day‑to‑day experimental execution and timelines.
Qualifications
Required
BS with 3+ years of relevant experience or MS with 1+ years of relevant experience in in vivo pharmacology, oncology, tumor biology, or a related discipline.
Demonstrated hands‑on experience with murine in vivo tumor models.
Experience performing in vivo dosing, tumor measurements, necropsy support, and sample collection.
Strong attention to detail, documentation quality, and experimental reproducibility.
Preferred
Experience supporting oncology drug discovery programs, particularly ADCs or immuno‑oncology agents.
Proven proficiency in aseptic technique and mammalian tissue culture.
Familiarity with basic PK/PD concepts.
Experience working in a high‑throughput, multi‑project laboratory environment.
Experience training or mentoring junior research staff on laboratory techniques.
Role Emphasis (Execution‑Focused)
Majority of time spent performing laboratory‑based experimental work
Limited scope beyond study execution and data generation
Emphasis on technical excellence, consistency, and high‑quality data delivery
Works under direction of senior staff members who provide study objectives and oversight
PHYSICAL/MENTAL REQUIREMENTS
Requires ability to perform in vivo laboratory work including sitting, standing, lifting (up to ~25 lbs), manual handling of animals and equipment, wearing PPE, and working in regulated animal facility environments. Role requires attention to detail, adherence to safety and animal welfare standards, and flexibility to support study-driven schedules.
Work Location Assignment: On Premise

The annual base salary for this position ranges from $68,600.00 to $114,300.00. In addition, this position is eligible for participation in Pfizer’s Global Performance Plan with a bonus target of 7.5% of the base salary. We offer comprehensive and generous benefits and programs to help our colleagues lead healthy lives and to support each of life’s moments. Benefits offered include a 401(k) plan with Pfizer Matching Contributions and an additional Pfizer Retirement Savings Contribution, paid vacation, holiday and personal days, paid caregiver/parental and medical leave, and health benefits to include medical, prescription drug, dental and vision coverage. Learn more at Pfizer Candidate Site – U.S. Benefits | (uscandidates.mypfizerbenefits.com). Pfizer compensation structures and benefit packages are aligned based on the location of hire. The United States salary range provided does not apply to Tampa, FL or any location outside of the United States.




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