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Accelovance

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uuid000f199

Namestring
Accelovance
Legal namestring
Linical
Websiteurl
accelovance.com
Company typeenum
Public
Founded yearint
2005
Descriptiontext

Accelovance is presented in firmographic data as a private, US-headquartered contract research organization (CRO) founded in 2004 and based in Rockville, Maryland, with 501–1,000 employees. However, the bulk of the available operating evidence describes a global CRO identity closely matching Linical — publicly listed on the Tokyo Stock Exchange (2183:JP), founded in 2005, and headquartered in Osaka, Japan — suggesting Accelovance may have been consolidated into or rebranded under the Linical platform. The combined entity operates a full-service CRO model organized around two service pillars: Drug Development Strategy (protocol design, regulatory affairs, regulatory consulting, quality assurance, medical writing) and Clinical Trial Management (feasibility, project management, medical affairs/pharmacovigilance, clinical monitoring, patient recruitment, biometrics, training academy), with a Functional Services Provider (FSP) offering listed as in development.

Therapeutic expertise spans oncology, neurology and psychiatry, immunology and vaccines, endocrinology and metabolic disorders, and specialty areas including biosimilars, rare disease, and pediatrics, with services delivered across early-phase through late-phase studies. Operations span 30+ countries across the Americas, Europe, and Asia Pacific, with documented PMDA-led regulatory expertise in Japan and FDA submission experience in the US. The company reports 600+ studies conducted in the past five years, 85%+ client retention, and 80%+ of studies beating enrollment goals. Recognitions include Best Global CRO 2024, Best Vaccine CRO (World Vaccine Congress), 2025 GHP Award Winner, and ISO-IEC-27001 certification.

The business model is professional services-based with multi-year enterprise contracts; engagements are initiated through a direct "Request a Proposal" sales motion targeting mid-sized biotechnology and biopharmaceutical sponsors. Pricing is quote-based with no public tiers disclosed, and go-to-market is enterprise field sales rather than self-service. Distribution relies on direct B2B engagement supported by an investigator network for site relationships and a content-driven marketing approach via a Resource Center of articles, case studies, and white papers.

Short descriptiontext

Accelovance is a US-based contract research organization providing full-service clinical development to mid-sized biotech and biopharmaceutical sponsors, with operations spanning 30+ countries across oncology, CNS, vaccines, and metabolic therapeutic areas.

Operating statusenum
Operating
Ownership categoryenum
Headcount rangeband
501–1,000
akta.pro rankint
HeadquartersRockville, United States
HQ citystring
Rockville
HQ countrystring
United States
HQ regionstring
North America
Markets served

Serves global market

Offices2 records

Each record includes

City, Country, Type, Description, Source

Keyword5 values
contract research services, clinical trial management, oncology clinical research, vaccine clinical trials, drug development strategy
Industry2 codes
1Regulatory Strategy & Global Submissions (IND/CTA/NDA/BLA/MAA)
CodeHLAGAKAAPrimaryYes
2Regulatory Strategy & IND/NDA/BLA Submissions Support
CodeHLAIALAHPrimaryNo
NAICS code1 code
  • Professional, Scientific, and Technical Services54
SIC code1 code
  • Services-Commercial Physical & Biological Research8731
Product category
Contract Research Organization (CRO) Services
GTM motion1 record

Each record includes

Type, Description, Source

Revenue model2 records
1Clinical Research Services
TypeProfessional Services
Description

Full-service CRO providing comprehensive clinical development services including drug development strategy, clinical trial management, and functional services to pharmaceutical and biotechnology companies

linical.com
2Functional Services Provider (FSP)
TypeManaged Services
Description

Offering functional service provider model as part of CRO services portfolio

linical.com
Marketing channels3 records

Each record includes

Title, Type, Stage, Description, Source

Distribution channels2 records

Each record includes

Title, Type, Scope, Target buyer, Description, Source

Cost components5 values
Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Pricing details1 tier
1Custom enterprise engagement
ModelOtherBilling cadenceMulti-year contract
Notes

Quote-based engagement through direct sales; no public pricing tiers disclosed

linical.com
GTM typeB2B
B2B
Offering typeServices
Services
Brand1 record
1Linical
Description

Global CRO providing drug development strategy and clinical trial management services across Americas, Europe, and Asia Pacific.

linical.com
Core offering1 text field

Accelovance is a global Contract Research Organization that delivers full-service clinical development services to pharmaceutical and biotechnology sponsors, with therapeutic specialization in oncology, vaccines, and general medicine. The portfolio spans drug development strategy (protocol design, regulatory affairs, quality assurance, medical writing) and clinical trial management (feasibility, project management, clinical monitoring, patient recruitment, biometrics, pharmacovigilance), complemented by a Functional Services Provider (FSP) model and global operations across 30+ countries.

Differentiator
Functional benefit
Problem solved
Quantifiable outcome1 of 3 values shown
  • 85%+ client retention rate demonstrating high satisfaction and repeat business
+2 more records
Product overview1 text field

Linical is an award-winning, global Contract Research Organization (CRO) providing comprehensive clinical development services. The portfolio consists of two core service pillars: Drug Development Strategy (including protocol development, regulatory affairs, regulatory consulting, quality assurance, and medical writing) and Clinical Trial Management (covering feasibility, project management, medical affairs, pharmacovigilance, clinical monitoring, patient recruitment, biometrics, and training). The company also offers a Functional Services Provider (FSP) model. Therapeutic expertise spans oncology, neurology & psychiatry, immunology & vaccines, endocrinology & metabolic, and other focus areas such as biosimilars, rare disease, and pediatrics. Services are delivered across clinical trial phases from early-phase through late-phase studies, with global operations covering The Americas, Europe, and Asia Pacific across more than 30 countries.

Product and service6 records
1Clinical Research Services
CategoryContract Research Organization (CRO) Services
Description

Full-service CRO offering comprehensive clinical development services — including drug development strategy, clinical trial management, and functional services — delivered to pharmaceutical and biotechnology sponsors across the Americas, Europe, and Asia Pacific.

2Clinical Trial Management
CategoryContract Research Organization (CRO) Services
Description

Full-range clinical trial management services providing flexibility and experience to bring products to market, covering feasibility, project management, clinical monitoring, patient recruitment, biometrics, and pharmacovigilance.

3Drug Development Strategy
CategoryContract Research Organization (CRO) Services
Description

Customized clinical trial planning service that proactively tackles obstacles, optimizes trial design, and positions trials for success through regulatory strategy, quality assurance, and medical writing.

4Functional Services Provider (FSP)
CategoryContract Research Organization (CRO) Services
Description

Flexible functional service provider model providing managed resourcing and functional support across the clinical development lifecycle for sponsors seeking embedded or hybrid resourcing models.

5Oncology Therapeutic Services
CategoryTherapeutic-Area CRO Services
Description

Specialized oncology clinical trial services covering solid tumors, liquid tumors, immunotherapies, rare cancers, and early-phase oncology studies for pharmaceutical and biotechnology sponsors.

6Vaccine & Immunology Therapeutic Services
CategoryTherapeutic-Area CRO Services
Description

Award-winning immunology and vaccine trial services covering prophylactic and therapeutic vaccines, outbreak and epidemic response, allergic and autoimmune disorders, and respiratory disorders.

Scale indicator6 records

Each record includes

Type, Value, Description, Source

Recent move5 records

Each record includes

Date, Type, Title, Description, Source

Expansion highlight4 records

Each record includes

Type, Description

Peers10 records
TypeDirect peer
Description

IQVIA is the world's largest CRO, offering full-service clinical development, technology-enabled trial solutions, and real-world data across all therapeutic areas. Directly competes with Linical/Accelovance for global clinical trial management engagements, particularly in oncology and Phase II/III work.

TypeDirect peer
Description

ICON is a top-tier global CRO with broad therapeutic-area coverage and a leading FSP business. Directly competes with Linical/Accelovance for full-service and functional outsourcing engagements with pharma and biotech sponsors.

TypeDirect peer
Description

Labcorp's Drug Development division is a major global CRO providing full-service clinical development and central laboratory services. Directly competes in clinical trial management across multiple therapeutic areas, including oncology and vaccines.

TypeDirect peer
Description

Charles River provides early-stage CRO services, discovery, and safety assessment, increasingly expanding into full-service clinical development. Directly competes for early-phase oncology and vaccine trial work, and overlaps with Linical/Accelovance on Phase I/II oncology programs.

TypeDirect peer
Description

PPD is a global CRO providing full-service clinical development, lab services, and site management, now part of Thermo Fisher. Directly competes for full-service clinical trial engagements with pharma and biotech sponsors across therapeutic areas including oncology.

TypeDirect peer
Description

Parexel is a global mid-to-large CRO with strong biopharma sponsor relationships and expertise in oncology and CNS. Directly competes with Linical/Accelovance for full-service and FSP engagements, particularly from mid-sized biotech sponsors.

TypeDirect peer
Description

Medpace is a mid-sized, full-service CRO with a strong oncology and specialty therapeutic focus and an organic-growth, scientist-led model. Directly competes for mid-sized biotech clinical trial engagements, especially in oncology, mirroring Linical/Accelovance's positioning.

TypeDirect peer
Description

Syneos Health is a global biopharma solutions organization offering clinical development and commercialization services. Directly competes for full-service clinical trial engagements, though its broader commercialization scope differentiates it slightly.

TypeDirect peer
Description

Worldwide Clinical Trials is a mid-sized global CRO specializing in neuroscience, oncology, cardiometabolic, and rare diseases. Closely comparable in scale and therapeutic-area focus, competing for the same mid-sized biotech sponsors.

TypeEmerging player
Description

WuXi AppTec is a leading Asia-based CRO/CDMO with rapidly expanding global clinical development capability. Competes in oncology trial services and Asia-Pacific trial execution, and represents an emerging global alternative for sponsors seeking non-Western CRO partnerships.

Market position
Strengths5 records

Each record includes

Headline, Details, Source

Weaknesses5 records

Each record includes

Headline, Details, Source

Competitive moat4 records

Each record includes

Type, Details

Key risks5 records

Each record includes

Headline, Details, Source

Key highlights7 records

Each record includes

Headline, Details, Source

Customer concentration

Classification, Details

Named customers4 records

Each record includes

Name, Industry, Type, Use case, Source, UUID

Segment5 records

Each record includes

Title, Type, Primary, Description, Pain point addressed, Use case, Source

Ideal customer profile2 records

Each record includes

Profile, Firmographic size, Sales motion, Sales cycle length, Buying structure, Purchase trigger, Buyer persona, Geography, Industry vertical, Primary use case, Description, Pain points, Evidence proof points, Target buyer

Technology focused
No
API detail
Has APIbool
No

Docs URL, Description

AI maturity
App detail

Has app

Feature3 records

Each record includes

Title, Differentiator, Description, Source

Core technology
Revenue estimate
Valuation estimate
Number of profiles
No data
Compliance1 record

Each record includes

Name, Class, Description

Funding overview

Funding stage, Last funding date, Total funding USD

Funding rounds

Each record includes

Round, Amount USD, Date, Pre money valuation, Total investors, Investors, News

Investors

Each record includes

Name, Type, Date of entry, Rounds participated, Website

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Each record includes

Name, Acquisition type, Announced date, Completed date, Status, Website, News

Investment

Each record includes

Name, Round, Announced date, Lead investor, Website, News

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Accelovance

Contract Research Organization (CRO) Servicesaccelovance.com

Accelovance is a US-based contract research organization providing full-service clinical development to mid-sized biotech and biopharmaceutical sponsors, with operations spanning 30+ countries across oncology, CNS, vaccines, and metabolic therapeutic areas.

What Accelovance does

Accelovance is presented in firmographic data as a private, US-headquartered contract research organization (CRO) founded in 2004 and based in Rockville, Maryland, with 501–1,000 employees. However, the bulk of the available operating evidence describes a global CRO identity closely matching Linical — publicly listed on the Tokyo Stock Exchange (2183:JP), founded in 2005, and headquartered in Osaka, Japan — suggesting Accelovance may have been consolidated into or rebranded under the Linical platform. The combined entity operates a full-service CRO model organized around two service pillars: Drug Development Strategy (protocol design, regulatory affairs, regulatory consulting, quality assurance, medical writing) and Clinical Trial Management (feasibility, project management, medical affairs/pharmacovigilance, clinical monitoring, patient recruitment, biometrics, training academy), with a Functional Services Provider (FSP) offering listed as in development.

Therapeutic expertise spans oncology, neurology and psychiatry, immunology and vaccines, endocrinology and metabolic disorders, and specialty areas including biosimilars, rare disease, and pediatrics, with services delivered across early-phase through late-phase studies. Operations span 30+ countries across the Americas, Europe, and Asia Pacific, with documented PMDA-led regulatory expertise in Japan and FDA submission experience in the US. The company reports 600+ studies conducted in the past five years, 85%+ client retention, and 80%+ of studies beating enrollment goals. Recognitions include Best Global CRO 2024, Best Vaccine CRO (World Vaccine Congress), 2025 GHP Award Winner, and ISO-IEC-27001 certification.

The business model is professional services-based with multi-year enterprise contracts; engagements are initiated through a direct "Request a Proposal" sales motion targeting mid-sized biotechnology and biopharmaceutical sponsors. Pricing is quote-based with no public tiers disclosed, and go-to-market is enterprise field sales rather than self-service. Distribution relies on direct B2B engagement supported by an investigator network for site relationships and a content-driven marketing approach via a Resource Center of articles, case studies, and white papers.

Accelovance firmographics

Firmographics
Name
Accelovance
Legal name
Linical
Website
https://accelovance.com
Company type
Public
Founded year
2005
Operating status
Operating
Headcount range
501–1,000 employees
Short description
Accelovance is a US-based contract research organization providing full-service clinical development to mid-sized biotech and biopharmaceutical sponsors, with operations spanning 30+ countries across oncology, CNS, vaccines, and metabolic therapeutic areas.
Ownership category
akta.pro rank

Accelovance industry classification

Industry
Product category
Contract Research Organization (CRO) Services
NAICS
Professional, Scientific, and Technical Services (54)
SIC
Services-Commercial Physical & Biological Research (8731)
akta.pro primary industry
Regulatory Strategy & Global Submissions (IND/CTA/NDA/BLA/MAA) (HLAGAKAA)
akta.pro secondary industry
Regulatory Strategy & IND/NDA/BLA Submissions Support (HLAIALAH)

Keywords

  • Contract research services
  • Clinical trial management
  • Oncology clinical research
  • Vaccine clinical trials
  • Drug development strategy

Where Accelovance is headquartered

Location

Headquarters

HQ city
Rockville
HQ country
United States
HQ region
North America

Offices2 records

Markets served

Accelovance business model

Business model
GTM type
B2B
Offering type
Services
Cost components
Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

  1. Clinical Research Services: Full-service CRO providing comprehensive clinical development services including drug development strategy, clinical trial management, and functional services to pharmaceutical and biotechnology companies
  2. Functional Services Provider (FSP): Offering functional service provider model as part of CRO services portfolio

Pricing tiers

ModelBillingPrice
OtherMulti-year contractCustom enterprise engagement

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Accelovance product offering

Product offering

Core offering

Accelovance is a global Contract Research Organization that delivers full-service clinical development services to pharmaceutical and biotechnology sponsors, with therapeutic specialization in oncology, vaccines, and general medicine. The portfolio spans drug development strategy (protocol design, regulatory affairs, quality assurance, medical writing) and clinical trial management (feasibility, project management, clinical monitoring, patient recruitment, biometrics, pharmacovigilance), complemented by a Functional Services Provider (FSP) model and global operations across 30+ countries.

Product overview

Linical is an award-winning, global Contract Research Organization (CRO) providing comprehensive clinical development services. The portfolio consists of two core service pillars: Drug Development Strategy (including protocol development, regulatory affairs, regulatory consulting, quality assurance, and medical writing) and Clinical Trial Management (covering feasibility, project management, medical affairs, pharmacovigilance, clinical monitoring, patient recruitment, biometrics, and training). The company also offers a Functional Services Provider (FSP) model. Therapeutic expertise spans oncology, neurology & psychiatry, immunology & vaccines, endocrinology & metabolic, and other focus areas such as biosimilars, rare disease, and pediatrics. Services are delivered across clinical trial phases from early-phase through late-phase studies, with global operations covering The Americas, Europe, and Asia Pacific across more than 30 countries.

Differentiator

Problem solved

Functional benefit

Brands

  • Linical: Global CRO providing drug development strategy and clinical trial management services across Americas, Europe, and Asia Pacific.

Products and services

  • Clinical Research Services Full-service CRO offering comprehensive clinical development services — including drug development strategy, clinical trial management, and functional services — delivered to pharmaceutical and biotechnology sponsors across the Americas, Europe, and Asia Pacific.
  • Clinical Trial Management Full-range clinical trial management services providing flexibility and experience to bring products to market, covering feasibility, project management, clinical monitoring, patient recruitment, biometrics, and pharmacovigilance.
  • Drug Development Strategy Customized clinical trial planning service that proactively tackles obstacles, optimizes trial design, and positions trials for success through regulatory strategy, quality assurance, and medical writing.
  • Functional Services Provider (FSP) Flexible functional service provider model providing managed resourcing and functional support across the clinical development lifecycle for sponsors seeking embedded or hybrid resourcing models.
  • Oncology Therapeutic Services Specialized oncology clinical trial services covering solid tumors, liquid tumors, immunotherapies, rare cancers, and early-phase oncology studies for pharmaceutical and biotechnology sponsors.
  • Vaccine & Immunology Therapeutic Services Award-winning immunology and vaccine trial services covering prophylactic and therapeutic vaccines, outbreak and epidemic response, allergic and autoimmune disorders, and respiratory disorders.

Quantifiable outcome

  • 85%+ client retention rate demonstrating high satisfaction and repeat business
  • +2 more outcomes

Companies that use Accelovance

Customer profile

Named customers4 records

Segments5 records

Ideal customer profiles2 records

Accelovance technology and API

Technology

Technology focussed No

API detail

Has API
No
API docs
API detail

Core technology

AI maturity

App detail

Feature3 records

Accelovance partnerships and signals

Strategic signal

Scale indicators6 records

Recent moves5 records

Expansion highlights4 records

Accelovance competitors and assessment

Company assessment

Direct peers

  • IQVIA: IQVIA is the world's largest CRO, offering full-service clinical development, technology-enabled trial solutions, and real-world data across all therapeutic areas. Directly competes with Linical/Accelovance for global clinical trial management engagements, particularly in oncology and Phase II/III work.
  • ICON plc: ICON is a top-tier global CRO with broad therapeutic-area coverage and a leading FSP business. Directly competes with Linical/Accelovance for full-service and functional outsourcing engagements with pharma and biotech sponsors.
  • Labcorp Drug Development (formerly Covance): Labcorp's Drug Development division is a major global CRO providing full-service clinical development and central laboratory services. Directly competes in clinical trial management across multiple therapeutic areas, including oncology and vaccines.
  • Charles River Laboratories: Charles River provides early-stage CRO services, discovery, and safety assessment, increasingly expanding into full-service clinical development. Directly competes for early-phase oncology and vaccine trial work, and overlaps with Linical/Accelovance on Phase I/II oncology programs.
  • PPD (Thermo Fisher Scientific): PPD is a global CRO providing full-service clinical development, lab services, and site management, now part of Thermo Fisher. Directly competes for full-service clinical trial engagements with pharma and biotech sponsors across therapeutic areas including oncology.
  • Parexel: Parexel is a global mid-to-large CRO with strong biopharma sponsor relationships and expertise in oncology and CNS. Directly competes with Linical/Accelovance for full-service and FSP engagements, particularly from mid-sized biotech sponsors.
  • Medpace: Medpace is a mid-sized, full-service CRO with a strong oncology and specialty therapeutic focus and an organic-growth, scientist-led model. Directly competes for mid-sized biotech clinical trial engagements, especially in oncology, mirroring Linical/Accelovance's positioning.
  • Syneos Health: Syneos Health is a global biopharma solutions organization offering clinical development and commercialization services. Directly competes for full-service clinical trial engagements, though its broader commercialization scope differentiates it slightly.
  • Worldwide Clinical Trials: Worldwide Clinical Trials is a mid-sized global CRO specializing in neuroscience, oncology, cardiometabolic, and rare diseases. Closely comparable in scale and therapeutic-area focus, competing for the same mid-sized biotech sponsors.

Emerging players

  • WuXi AppTec: WuXi AppTec is a leading Asia-based CRO/CDMO with rapidly expanding global clinical development capability. Competes in oncology trial services and Asia-Pacific trial execution, and represents an emerging global alternative for sponsors seeking non-Western CRO partnerships.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

Accelovance social profiles

Digital presence

Accelovance compliance and trust

Trust signal

Compliance1 record

Accelovance financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Accelovance leadership team

Management profile

Number of profiles

Accelovance funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

Accelovance M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Accelovance

What does Accelovance do?

Accelovance is a global Contract Research Organization that delivers full-service clinical development services to pharmaceutical and biotechnology sponsors, with therapeutic specialization in oncology, vaccines, and general medicine. The portfolio spans drug development strategy (protocol design, regulatory affairs, quality assurance, medical writing) and clinical trial management (feasibility, project management, clinical monitoring, patient recruitment, biometrics, pharmacovigilance), complemented by a Functional Services Provider (FSP) model and global operations across 30+ countries.

Is Accelovance a public or private company?

Accelovance is a public company. It is classified as unknown and is currently operating.

When was Accelovance founded?

Accelovance was founded in 2005. It employs 501 to 1,000 people.

Where is Accelovance based?

Accelovance is headquartered in Rockville, United States, in the North America region.

How does Accelovance make money?

Two revenue lines are on record. Clinical Research Services are the primary driver. The others are functional Services Provider (FSP).

Who are Accelovance's main competitors?

Direct peers on record are IQVIA, ICON plc, Labcorp Drug Development (formerly Covance), Charles River Laboratories, PPD (Thermo Fisher Scientific), Parexel, Medpace, Syneos Health and Worldwide Clinical Trials. WuXi AppTec is listed as an emerging player.

Does Accelovance have an API?

No public API is recorded for Accelovance.

What industry is Accelovance in?

Accelovance's product category is Contract Research Organization (CRO) Services. Its primary akta.pro industry code is HLAGAKAA, Regulatory Strategy & Global Submissions (IND/CTA/NDA/BLA/MAA), with a secondary code of HLAIALAH, Regulatory Strategy & IND/NDA/BLA Submissions Support. Its NAICS code is 54 and its SIC code is 8731.

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Live signals
PR NewswireAccelovance & Linical Merge Organizations to Form a Best-in-Class CRO with Increased Global ReachAccelovance, Inc., a U.S.-based contract research organization specializing in oncology, vaccines, and general medicine, announced it has signed a merger agreement with Linical, a Japan-based CRO focused on oncology, immunology, and neurology, scheduled to close in early Q2 2018. The transaction will create a market-leading CRO with significant global scale across North America, Europe, and Asia Pacific, combining both companies' 13-year track records and therapeutic expertise. The merged entity will offer comprehensive clinical development services covering the entire drug lifecycle as a one-stop provider for biopharmaceutical clients.GlobeNewswireImmunicum Engages US Based Accelovance and the Midwest Melanoma Partnership (MMP) to Evaluate INTUVAX and to Advance the Clinical Studies Pipeline into the USImmunicum AB signed a clinical development services agreement with Accelovance and the Midwest Melanoma Partnership to advance its cancer immune primer INTUVAX into US trials for kidney cancer and melanoma. Accelovance will provide clinical monitoring, data management, and biostatistics, with Dr. Arkadiusz Dudek as lead investigator for both trials, slated to begin later this year.GlobeNewswireDelSite Biotechnologies Announces Master Service Agreement With Accelovance, Inc. for Clinical ServicesDelSite Biotechnologies and Accelovance signed a Master Service Agreement for Accelovance to provide full CRO services for a phase I dose-escalating study of DelSite's GelVac nasal powder H5N1 influenza vaccine. The vaccine offers room-temperature stability and needle-free administration, with Accelovance owning nine clinical sites. The study aims to advance the vaccine toward clinical stage.