Company lists · Data refreshed September 2026
Top 25 Oncology practices worldwide
RevenueBase identified 2,770 oncology practices worldwide as of September 2026 and tracks 155,630 professional contacts across them, including 26,550 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers oncology practices 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 practices 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 practices worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 6,380 contacts → | ||||
Indirect evidence “Você sabe a diferença entre um Cancer Center e um hospital geral?” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 4,956 contacts → | ||||
Indirect evidence “Fred Hutch is an independent, nonprofit organization that also serves as the cancer program for UW Medicine.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 3,774 contacts → | ||||
Indirect evidence “Cleveland Clinic Abu Dhabi, part of the M42 group, is a unique and unparalleled extension of US-based Cleveland Clinic’s model of care, specifically designed to address a range of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 3,489 contacts → | ||||
Indirect evidence “Inaugurado em 2008, o Instituto do Câncer do Estado de São Paulo (Icesp), unidade que integra o Hospital das Clínicas da Faculdade de Medicina da USP, possui contrato de gestão…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 2,968 contacts → | ||||
Indirect evidence “Ons Amphia Bij Amphia verlenen we zorg die past bij wat de patiënt nodig heeft.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 2,911 contacts → | ||||
Indirect evidence “Na década de 1960, o único hospital especializado para tratamento de câncer estava na capital do estado de São Paulo e os pacientes que apareciam com a doença, no Hospital São…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 2,591 contacts → | ||||
Strong evidence “Founded in 1984, Florida Cancer Specialists & Research Institute (FCS) is the largest independent medical oncology/hematology practice in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 2,239 contacts → | ||||
Partial evidence “Every day, The US Oncology Network helps approximately 3,300 providers deliver value-based, integrated care for patients-close to home.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,919 contacts → | ||||
Indirect evidence “GenesisCare is a provider of integrated cancer care in Australia, Spain, and the U.K.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,756 contacts → | ||||
Indirect evidence “Burjeel Medical City is the largest medical care facility under the banner of Burjeel Holdings.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,723 contacts → | ||||
Indirect evidence “For more than 100 years, Good Samaritan has been a health care leader in southwestern Indiana and southeastern Illinois.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,580 contacts → | ||||
Indirect evidence “At Novartis, our mission is to discover new ways to improve and extend people's lives.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,443 contacts → | ||||
Indirect evidence “Icon Group is a leading integrated healthcare provider with global reach across Australia, New Zealand, ASEAN, the United Kingdom and Germany.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,236 contacts → | ||||
Indirect evidence “Le CHU de Brest se positionne comme le premier acteur de santé de Bretagne occidentale, avec 7 500 agents répartis sur 9 sites.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 1,049 contacts → | ||||
Indirect evidence “Nos anos de 1920 o câncer era tratado - tanto para médicos, quanto para a sociedade em geral – com tabu, mas o médico Erasto Gaertner via a doença com outros olhos.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 1,021 contacts → | ||||
Indirect evidence “HealthCare Global Enterprises Ltd, headquartered in Bangalore is India's largest Cancer Care Provider.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 939 contacts → | ||||
Indirect evidence “A história do Hospital Santa Marcelina iniciou-se com a aquisição, em 1958, da chácara Santo Antônio, em Itaquera, em princípio, destinada ao atendimento de irmãs idosas e doentes.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 918 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 825 contacts → | ||||
Partial evidence “American Oncology Institute (AOI) is the leading and fastest growing Multi disciplinary oncology network with 15 Hospitals in South Asia, blending the latest technology with…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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. | |||||
| 21 | 761 contacts → | ||||
Partial evidence “Fundada em 2011, a Oncologia D’Or é composta por clínicas focadas no diagnóstico e tratamento do câncer e de doenças hematológicas, com padrão de qualidade reconhecido…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 748 contacts → | ||||
Partial evidence “L’Institut Català d’Oncologia (ICO) és un centre públic, dedicat exclusivament al càncer, que depèn del Departament de Salut del govern autonòmic de Catalunya (Espanya).” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 709 contacts → | ||||
Indirect evidence “VERSION FRANCAISE Centre multidisciplinaire intégré, unique en Belgique et reconnu internationalement, l’Institut Jules Bordet est un hôpital entièrement consacré aux patients…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 708 contacts → | ||||
Indirect evidence “United Hospital, a JCI-accredited private healthcare facility in Bangladesh, is one of the largest in the country with over 500 beds and 12 state-of-the-art operation theaters.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 686 contacts → | ||||
Partial evidence “Fundada em 1.968, o IBCC Oncologia é conhecida por ser um Centro de Tratamento Oncológico de alta complexidade e possuir um Centro de Pesquisa Clínica com mais de 130 estudos…” 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 practices. 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 practices.
- Partial evidence
- Its own public description names part of oncology practices, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name oncology practices. 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 2,770 oncology practices worldwide
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 26,550 reachable decision-makers.
Free signup · no credit card
Oncology practices 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 practices, 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 practices are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “oncology practices”. 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 practices), 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 practices, 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, 26,550 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 practices by location
11 lists · largest firstEvery Oncology practices list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Oncology practices based in the United States833
- Oncology practices based in Brazil340
- Oncology practices based in India245
- Oncology practices based in Germany139
- Oncology practices based in France99
- Oncology practices based in Australia54
- Oncology practices based in the United Kingdom38
- Oncology practices based in Italy36
- Oncology practices based in Spain36
- Oncology practices based in Switzerland32
- Oncology practices based in the Netherlands31
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 practices, 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 practices are there worldwide?
RevenueBase identified 2,770 oncology practices 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?
A.C.Camargo Cancer Center, headquartered in Sao Paulo, tops this list with the largest team on record.
Which country has the most oncology practices?
The United States leads with 833 companies, followed by Brazil (340) and India (245). Every oncology practices list by country and city is linked on this page.
Which city has the most oncology practices?
Sao Paulo leads with 57 headquartered companies, followed by New York (19) and Ahmedabad (16).
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 26,550 verified decision-maker contacts tracked across these 2,770 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.
Ready to reach these companies? Verified emails and direct dials for all 2,770 oncology practices worldwide. Start with a free account, no credit card.
Download this list →Related lists
Browse the directory
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.