YL201

Clinical trials are investigating YL201 in people with advanced solid tumors. These studies are looking at safety, dose limits, and early signs of anti-tumor activity when YL201 is given with atezolizumab. The trial is in Phase 1 and is enrolling adults with advanced solid tumors.

Table of contents

Trial overview

The available trial data describe one interventional study of YL201 in people with advanced solid tumors. An interventional study means the researchers give a treatment and then measure what happens.

This study is listed as Authorised and is in Phase 1. The planned enrollment is 243 participants.[1]

Who the study is for

The trial is designed for patients with advanced solid tumors.[1] The source data does not give more detailed eligibility rules, so we cannot say which exact cancer types or patient features are needed.

The study title says YL201 is being tested in combination with other anti-cancer therapies, and the brief summary names atezolizumab as the partner treatment.[1]

What researchers are measuring

In Part 1, the main goals are to assess safety and to find the maximum tolerated dose (MTD) of YL201 when used with atezolizumab.[1] Safety means watching closely for problems during treatment.

The primary endpoints in Part 1 include adverse events (medical problems that happen during the study), laboratory abnormalities (unusual blood or lab test results), and dose-limiting toxicities (serious side effects that limit dosing).[1]

In Part 2, the trial looks at anti-tumor activity, which means whether the treatment shows signs of helping the cancer.[1] The primary endpoints in Part 2 are objective response rate (ORR) and progression-free survival (PFS), both assessed using RECIST version 1.1.[1]

Study design and phase

This is a Phase 1 study, which is usually the first step in testing a treatment combination in people.[1] Phase 1 studies often focus on safety, dose finding, and early signs that the treatment may work.

The study is not a simple single-purpose trial. It has two parts: Part 1 focuses on safety and dose finding, and Part 2 focuses on whether the treatment has anti-cancer activity.[1]

What the combination study is trying to learn

The brief summary says Part 1 is meant to assess the safety of YL201 in combination with atezolizumab and to determine the MTD.[1] This helps researchers understand how the combination behaves in the body in a study setting.

Part 2 is meant to assess the anti-tumor activity of the same combination.[1] The study uses scan-based measures such as ORR and PFS to see whether tumors shrink and how long the cancer stays controlled.

Because the source data only includes one authorised trial, the current picture of YL201 research is limited to this advanced solid tumor study.[1]

Key patient terms

Objective response rate means the share of patients whose tumors get smaller or disappear on scans.[1]

Progression-free survival means the length of time before the cancer gets worse.[1]

RECIST version 1.1 is a standard system doctors and researchers use to measure tumor changes on imaging scans.[1]

Dose-limiting toxicities are side effects that are serious enough to stop researchers from giving more of the treatment.[1]

Trial ID Phase Condition studied Status Enrollment
2025-523742-27-00 Phase 1 Advanced solid tumors Authorised 243

Ongoing Clinical Trials on YL201

  • A study of YL201 and atezolizumab for patients with advanced solid tumors

    Recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    Belgium France Germany Hungary Italy Poland +2

Glossary

  • Advanced solid tumors: Cancers that form a mass or lump and have grown beyond the early stage. They may have spread or be harder to treat than early cancer.
  • Interventional study: A clinical trial where researchers give a treatment and watch what happens. This helps them test whether the treatment is safe and whether it may work.
  • Phase 1: The first main stage of testing a treatment in people. The focus is usually safety, side effects, and dose finding.
  • Atezolizumab: A cancer medicine used in this study together with YL201. The trial is testing the combination, not just YL201 alone.
  • Maximum tolerated dose (MTD): The highest dose that most people can take without having serious or unacceptable side effects.
  • Anti-tumor activity: Signs that a treatment may help fight cancer, such as shrinking tumors or slowing their growth.
  • Adverse events (AEs): Medical problems or unwanted effects that happen during a study. They may or may not be caused by the treatment.
  • Laboratory abnormalities: Unusual results in blood or other lab tests. These can show how the body is reacting to a treatment.
  • Dose-limiting toxicities (DLTs): Side effects that are serious enough to limit how much of a treatment can be given.
  • Objective response rate (ORR): The percentage of patients whose tumors shrink or disappear based on scan results.
  • Progression-free survival (PFS): The length of time during and after treatment that a patient lives without the cancer getting worse.
  • RECIST version 1.1: A standard set of rules used to measure how tumors change on scans in cancer trials.

References

  1. https://clinicaltrials.gov/study/2025-523742-27-00