Company lists · Data refreshed September 2026
Top 25 Oncology support services worldwide
RevenueBase identified 1,630 oncology support services worldwide as of September 2026 and tracks 36,660 professional contacts across them, including 7,259 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers oncology support services worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026. Country and city lists for oncology support services follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest oncology support services worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,856 contacts → | ||||
Indirect evidence “We're doing whatever it takes to help more people with cancer get the best care the UK has to offer, whoever and wherever they are.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 783 contacts → | ||||
Partial evidence “As a comprehensive community oncology center, NYCBS delivers world-class cancer care close to home.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 630 contacts → | ||||
Partial evidence “Onco360 is recognized as one of the nation's leading independent specialty pharmacies dedicated exclusively to oncology and rare disease patients.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 618 contacts → | ||||
Partial evidence “CARTI is a not-for-profit, multidisciplinary cancer care provider offering leading-edge medical, radiation and surgical oncology, interventional radiology, as well as an array of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 404 contacts → | ||||
Partial evidence “Founded in 2007, The Oncology Institute (NASDAQ: TOI) is advancing oncology by delivering highly specialized, value-based cancer care in the community setting.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 332 contacts → | ||||
Indirect evidence “Conceptualised in the year 2004 as a philanthropic initiative for the Eastern and North-Eastern parts of India and the neighbouring countries, the Tata Medical Center (TMC)…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 329 contacts → | ||||
Indirect evidence “Somos la institución de mayor integralidad en la atención del paciente oncológico en el Eje Cafetero colombiano.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 319 contacts → | ||||
Indirect evidence “Georgia Cancer Specialists is a Top 10 private cancer practice in the U.S.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 272 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 269 contacts → | ||||
Indirect evidence “Com quase três décadas de experiência no combate ao câncer, oferecemos uma linha completa de cuidados, do diagnóstico ao tratamento, em um modelo de assistência que une…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 252 contacts → | ||||
Indirect evidence “Our Mission: At The Cancer & Hematology Centers we are dedicated to help, healing and hope for cancer patients and their families.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 240 contacts → | ||||
Indirect evidence “Há cinco décadas, o Hemolabor tem um propósito que atravessa gerações: cuidar da vida em todas as suas fases.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 221 contacts → | ||||
Partial evidence “Nata nel 1978 per opera dell’oncologo Franco Pannuti, dal 1985 a oggi Fondazione ANT Franco Pannuti - ETS – la più ampia realtà non profit per l’assistenza specialistica…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 208 contacts → | ||||
Partial evidence “Illinois CancerCare is one of the largest private oncology and hematology practices in Illinois and in the entire nation.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 201 contacts → | ||||
Indirect evidence “A Liga Portuguesa Contra o Cancro é uma Associação Cultural e de Serviço Social, privada, declarada de Utilidade Pública, que promove a prevenção primária e secundária do cancro…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 198 contacts → | ||||
Indirect evidence “When you hear the word cancer, start here.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 197 contacts → | ||||
Indirect evidence “Masaryk Memorial Cancer Institute (MMCI) in Brno is a specialized comprehensive cancer center with supraregional activity that is certified by two quality certificates – by Joint…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 190 contacts → | ||||
Indirect evidence “Here for everyone affected by cancer | Yma i bawb a effeithir gan ganser Call us free | Ffoniwch am ddim.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 186 contacts → | ||||
Partial evidence “California Cancer Associates for Research and Excellence (cCARE), is the largest full-service, private oncology practice in California.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 184 contacts → | ||||
Partial evidence “CSC uplifts and strengthens people impacted by cancer by providing support, fostering compassionate communities, and breaking down barriers to care through education, research…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 158 contacts → | ||||
Partial evidence “Icon Oncology is a nationwide network of oncology specialists, committed to widening access to quality cancer care in South Africa.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 152 contacts → | ||||
Indirect evidence “What makes our practice truly special is that everyone at HOA is “united in spirit” – a spirit that is utterly un-crushable and filled with possibilities and hope.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 147 contacts → | ||||
Indirect evidence “HCG Cancer Centre Vadodara is one of Gujarat's finest and most trustworthy cancer care institutions that facilitate holistic approach in cancer care through screening, diagnosis…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 145 contacts → | ||||
Partial evidence “GVI Oncology is now known as Cancercare.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 143 contacts → | ||||
Partial evidence “The Arizona Center for Cancer Care is a Multispecialty Oncology group that is comprised of Radiation Oncology, Medical Oncology and Hematology, Gynecologic Oncology, Urology, and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: oncology support services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names oncology support services.
- Partial evidence
- Its own public description names part of oncology support services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name oncology support services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 1,630 oncology support services worldwide
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Oncology support services worldwide at a glance
As of Sep 20, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among oncology support services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for oncology support services are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “oncology support services”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names oncology support services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among oncology support services, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 7,259 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Oncology support services by location
9 lists · largest firstEvery Oncology support services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Oncology support services based in the United States473
- Oncology support services based in Brazil190
- Oncology support services based in India101
- Oncology support services based in the Netherlands64
- Oncology support services based in France49
- Oncology support services based in the United Kingdom49
- Oncology support services based in Spain35
- Oncology support services based in Australia34
- Oncology support services based in Canada33
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names oncology support services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many oncology support services are there worldwide?
RevenueBase identified 1,630 oncology support services worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Macmillan Cancer Support, headquartered in London, tops this list with the largest team on record.
Which country has the most oncology support services?
The United States leads with 473 companies, followed by Brazil (190) and India (101). Every oncology support services list by country and city is linked on this page.
Which city has the most oncology support services?
Sao Paulo leads with 20 headquartered companies, followed by Austin (10) and Barcelona (9).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 7,259 verified decision-maker contacts tracked across these 1,630 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.