Immuno-Oncology Conferences 2027: Best Events to Attend & Sponsor

Immuno-Oncology Conferences 2027: Best Events to Attend & Sponsor

There are now immuno-oncology meetings almost every month. The real question is not whether to attend, but which ones will move your work forward, and which are worth a sponsorship budget.

We have built this list to cut through the noise. It covers the most useful immuno-oncology and cancer immunotherapy conferences from November 2026 to November 2027, with dates and locations checked against each organiser’s official website, and guidance on who each event suits best.

Key takeaways

• The IO calendar now runs year-round: Phoenix and London close 2026, and Los Angeles, Boston, Orlando, Chicago, Barcelona and National Harbor follow in 2027.
• Large congresses (AACR, ASCO, ESMO, SITC) are where data first appears; focused meetings are where partnerships and biomarker strategy get worked out.
• Choose by role: clinical investigators, translational scientists, biomarker and CDx teams, and business development teams each get the most from different meetings.
• For sponsors, audience seniority, structured 1:1 meetings and fit with your buyers matter more than total attendance.

How we chose these conferences

We assessed each conference on:

• Scientific quality and relevance to current IO challenges: biomarkers, combinations and new modalities
• Who attends: the mix of academic, pharma, biotech, diagnostics, clinical and regulatory professionals
• Format: data presentation, education or business development and partnering
• Track record and organiser credibility

We excluded broad “world congress” series with no clear organiser or peer-review standards. Dates below were verified on official websites in October 2026; always confirm before booking.

Immuno-oncology conference calendar: November 2026 to November 2027

The best immuno-oncology conferences in 2027

1. ImmunoMark Summit (San Diego, London, Boston)

Disclosure: ImmunoMark Summit is organised by us, Convolign Business Consulting.

When and where: San Diego, 10–11 February 2027 · London, 3–4 March 2027 · Boston, June 2027

ImmunoMark is built around the gap most IO meetings leave: the biomarkers and companion diagnostics that decide which patients benefit. Each edition runs two parallel streams, Immuno-Oncology and Biomarkers & CDx, with pre-arranged 1:1 meetings so business development happens by design. London 2026 brought together 300+ attendees from 100+ companies, 50% at VP level or above.

Best for: biomarker scientists, CDx developers, translational leads and BD teams. Sponsorship packages for all three editions.

2. SITC Annual Meeting

When and where: 4–8 November 2026, Phoenix · 3–7 November 2027, National Harbor, MD

The largest meeting dedicated to cancer immunotherapy, combining basic science, clinical data and industry programmes. If you can attend only one large IO meeting a year, this is usually it. See our guide to the IO biomarker trends to watch heading into the 2026 meeting.

Best for: everyone working in IO, from bench to clinic to business development.

3. ESMO Immuno-Oncology & Advanced Therapies Congress

When and where: 14–16 December 2026, London (and online)

ESMO’s dedicated IO meeting, now renamed to include advanced therapies, focuses on clinical practice and how immunotherapy and cell therapy are used in patients. The 2027 edition has not yet been announced.

Best for: medical oncologists, clinical researchers and medical affairs teams.

4. Keystone Symposia: Cancer Immunotherapy

When and where: 24–27 January 2027, Breckenridge, CO

A small, discussion-heavy scientific meeting on bridging basic research and clinical translation, covering resistance, the tumour microenvironment, spatial biology and AI. Antoni Ribas gives the keynote. Early registration closes 23 November 2026.

Best for: translational scientists and academic investigators.

5. AACR IO 2027: Discovery and Innovation in Cancer Immunology

When and where: 28 February – 3 March 2027, Los Angeles

AACR’s dedicated cancer immunology conference spans basic discovery to translational research, with a strong mechanistic focus.

Best for: IO scientists and early-stage drug discovery teams.

6. Immuno-Oncology 360° (IO360°)

When and where: 15–17 March 2027, Boston

A business-focused meeting where biopharma R&D leaders, business development teams and investors discuss pipelines, partnering and deal-making in IO.

Best for: BD, licensing and investor audiences.

7. SITC Spring Scientific

When and where: 24–26 February 2027, San Diego

A smaller SITC meeting on a focused translational theme, which has not yet been announced for 2027. It falls two weeks after ImmunoMark San Diego, making a San Diego trip in February doubly useful.

Best for: translational scientists who want depth on one topic.

8. AACR Annual Meeting

When and where: 2–7 April 2027, Orlando

Covers all of cancer research, with a very large immunotherapy programme. Expect major early clinical and translational IO data.

Best for: researchers across disciplines and teams tracking the whole field.

9. ASCO Annual Meeting

When and where: 4–8 June 2027, Chicago

The world’s largest clinical oncology meeting, where practice-changing IO trial results are often presented first.

Best for: clinical investigators, medical affairs and clinical development teams.

10. ESMO Congress

When and where: 17–21 September 2027, Barcelona

Europe’s flagship clinical oncology meeting, with major IO data and a large European regulatory and clinical audience.

Best for: European clinical teams and anyone building EU partnerships.

11. PEGS Boston

When and where: 10–14 May 2027, Boston

The leading protein and antibody engineering meeting, highly relevant for bispecifics, T cell engagers and ADC developers.

Best for: antibody engineers and biologics R&D teams.

12. EACR 2027 Congress

When and where: 14–17 June 2027, Bilbao

The European Association for Cancer Research’s congress, strong on basic and translational cancer biology, including tumour immunology.

Best for: European academic and translational researchers.

Also worth watching

• ESMO Targeted Anticancer Therapies Congress (22–24 February 2027, Paris): early drug development and biomarker-driven phase I trials.
• World ADC London (8–11 March 2027): the main European meeting for antibody-drug conjugates, the week after ImmunoMark London.
• CIMT Annual Meeting (May 2027, Mainz; dates to be confirmed): Europe’s long-running cancer immunotherapy meeting.
• CHI Immuno-Oncology Summit: the 2026 edition was in Boston in August; 2027 dates are not yet announced.

How to choose the right IO conference

• Clinical investigators: ASCO, ESMO and ESMO IO for practice-changing data.
• Translational scientists: Keystone, AACR IO and SITC Spring Scientific for depth and discussion.
• Biomarker and CDx teams: ImmunoMark Summit, plus SITC for the latest translational data.
• BD, licensing and investors: IO360°, ImmunoMark’s pre-arranged 1:1 meetings and the partnering programmes around the large congresses.

Choosing an IO conference to sponsor

For sponsors, the best conference is the one where your buyers are in the room and you can actually meet them. Before committing budget, ask:

• What share of attendees are VP level or above, and in which functions?
• Are 1:1 meetings arranged in advance, and how many come with the package?
• Can you speak in a session your target audience will attend?
• Will you receive attendee data after the event for follow-up?

Large congresses offer reach; focused meetings offer conversations. Many IO and diagnostics companies combine one of each. See ImmunoMark 2027 sponsorship options for San Diego, London and Boston.

FAQs

What is the biggest immuno-oncology conference?

The SITC Annual Meeting is the largest meeting dedicated specifically to cancer immunotherapy. In 2026 it runs 4–8 November in Phoenix; in 2027 it runs 3–7 November in National Harbor, Maryland.

When is AACR IO 2027?

AACR IO 2027: Discovery and Innovation in Cancer Immunology runs from 28 February to 3 March 2027 in Los Angeles.

Is there an immuno-oncology conference focused on biomarkers?

Yes. ImmunoMark Summit focuses on the intersection of immuno-oncology and biomarkers, with editions in San Diego (10–11 February 2027), London (3–4 March 2027) and Boston (June 2027).

Which immuno-oncology conferences are in Europe in 2027?

Key European meetings include ImmunoMark Summit London (3–4 March), ESMO Targeted Anticancer Therapies in Paris (22–24 February), EACR 2027 in Bilbao (14–17 June) and the ESMO Congress in Barcelona (17–21 September).

Plan your 2027 IO calendar with ImmunoMark

ImmunoMark Summit brings senior pharma, biotech and diagnostics leaders together in three cities in 2027, with two parallel streams and pre-arranged 1:1 meetings at every edition.

Travelling to one of them? Our city guides list what else is on around each edition: the San Diego biotech events guide, the London biotech and life sciences events guide and the Boston biotech and life sciences events guide. For the science driving this year’s agendas, see our roundup of immuno-oncology biomarker trends to watch.

See all 2027 editions