A Phase 3 interventional study of QLC5508 and QL2107 in Extensive-stage Small Cell Lung Cancer, sponsored by Qilu Pharmaceutical Co., Ltd.. Recruiting at 1 site in China. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-30.
Sponsored by Qilu Pharmaceutical Co., Ltd. · Phase 3, Interventional, and Treatment
This trial is a Phase III, randomized, open-label, multicenter study to evaluate the efficacy and safety of QLC5508 in combination with QL2107 versus Tislelizumab plus platinum and etoposide as first-line treatment in participants with extensive-stage small cell lung cancer.
1,301 studies on the registry are indexed under Small Cell Lung Carcinoma; 367 are open to participants now.
This study's planned enrollment of 556 is above the median of 56 across 1,077 interventional studies indexed under Small Cell Lung Carcinoma.
Browse Small Cell Lung Carcinoma studies →Qilu Pharmaceutical Co., Ltd. is the lead sponsor of 198 studies on the registry; 120 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Has received or undergoing any of the following treatment:
Previous or current treatment with B7-H3 targeted therapy. Previous or current treatment with topoisomerase I inhibitors.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Cancer deposits in the brain from a cancer that started elsewhere in the body (CNS metastases include the spinal cord).
Studies differ: some leave out any brain metastases, some accept ones treated and stable for some weeks. Check what this study allows.
Cancer that has spread to the leptomeninges, the thin layers covering the brain and spinal cord, and the fluid between them. It is not the same as brain metastases.
Criteria often treat it separately, and many studies leave it out even where treated brain metastases are allowed.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
The US National Cancer Institute’s scale of how severe an adverse event is — any unwanted medical event during a study, such as a symptom, an illness or an abnormal test result, whether or not a treatment caused it. Whether it did is judged separately.
“Side effects of earlier treatment resolved to grade 1 or less” means they have settled to mild or gone.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Histologically or cytologically confirmed
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
RECIST
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Brain metastases
Cancer deposits in the brain from a cancer that started elsewhere in the body (CNS metastases include the spinal cord).
Studies differ: some leave out any brain metastases, some accept ones treated and stable for some weeks. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Leptomeningeal disease
Cancer that has spread to the leptomeninges, the thin layers covering the brain and spinal cord, and the fluid between them. It is not the same as brain metastases.
Criteria often treat it separately, and many studies leave it out even where treated brain metastases are allowed.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CTCAE grade
The US National Cancer Institute’s scale of how severe an adverse event is — any unwanted medical event during a study, such as a symptom, an illness or an abnormal test result, whether or not a treatment caused it. Whether it did is judged separately.
“Side effects of earlier treatment resolved to grade 1 or less” means they have settled to mild or gone.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Drug: QLC5508 · Drug: QL2107
Drug: Tislelizumab · Drug: Carboplatin · Drug: Cisplatin · Drug: Etoposide
QLC5508 will be administered intravenously once every 3 weeks. Treatment will continue until disease progression or unacceptable toxicity, whichever occurs first.
QL2107 will be administered intravenously once every 3 weeks. Treatment will continue until disease progression or unacceptable toxicity. The maximum treatment duration for QL2107 will be 2 years.
Tislelizumab will be administered intravenously once every 3 weeks. Treatment will continue until disease progression or unacceptable toxicity. The maximum treatment duration for Tislelizumab will be 2 years.
Carboplatin will be administered intravenously once every 3 weeks. Carboplatin treatment will be administered for up to 4 cycles.
Cisplatin will be administered intravenously once every 3 weeks. Cisplatin treatment will be administered for up to 4 cycles.
Etoposide will be administered intravenously once every 3 weeks. Etoposide treatment will be administered for up to 4 cycles.
Overall survival (OS)
OS is defined as the duration from the date of randomization to the date of death due to any cause.
Time frame: Up to approximately 36 months
Progression-free survival (PFS)
PFS is defined as the duration from the date of randomization to the date of first documented progressive disease (PD) based on investigator assessment, or death from any cause, whichever occurs first.
Time frame: Up to approximately 36 months
Objective response rate (ORR)
ORR is defined as the percentage of participants achieved complete response or partial response as assessed according to RECIST v1.1 criteria.
Time frame: Up to approximately 36 months
Duration of response (DOR)
DOR is defined as the duration from the first documented objective response to the first documented disease progression or death from any cause, whichever occurs first.
Time frame: Up to approximately 36 months
Disease control rate (DCR)
DCR is defined as the percentage of participants achieved complete response, partial response, or stable disease as assessed according to RECIST v1.1 criteria.
Time frame: Up to approximately 36 months
6-month PFS rate
The 6-month PFS rate is defined as the proportion of participants who have not experienced PD and who are alive at 6 months from the date of randomization.
Time frame: Up to approximately 36 months
12-month PFS rate
The 12-month PFS rate is defined as the proportion of participants who have not experienced PD and who are alive at 12 months from the date of randomization.
Time frame: Up to approximately 36 months
12-month OS rate
The 12-month OS rate is defined as the proportion of participants who are alive at 12 months from the date of randomization.
Time frame: Up to approximately 36 months
24-month OS rate
The 24-month OS rate is defined as the proportion of participants who are alive at 24 months from the date of randomization.
Time frame: Up to approximately 36 months
Treatment Emergent Adverse Event (TEAE)
TEAEs are defined as any adverse event (AE) that occurs after the initiation of study treatment, or any pre-existing condition that worsens in severity or frequency after the initiation of study treatment, regardless of the causal relationship to the study treatment. TEAEs will be graded and summarized by type, frequency, and severity according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 6.0.
Time frame: Up to approximately 36 months
Started Oct 2026 (actual). Primary completion is estimated for Mar 2029, 28 months after the start.
Of 56 industry-sponsored phase 3 interventional studies under Small Cell Lung Carcinoma, half reached primary completion within 36 months of starting (the median), counting those still running; a quarter within 30 and three quarters within 44. This study's planned 28 months is below that.
Counting every sponsor, half of 69 studies reached it within 44 months; a quarter within 31 and three quarters within 48.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
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Studies of the drug tested here: QLC5508
Qilu Pharmaceutical Co., Ltd. →