A trial of tiragolumab, atezolizumab and chemotherapy for small cell lung cancer (Skyscraper 02)

Please note - this trial is no longer recruiting patients. We hope to add results when they are available.

Cancer type:

Lung cancer
Secondary cancers
Small cell lung cancer




Phase 3

This trial is looking at adding tiragolumab to atezolizumab and chemotherapy for small cell lung cancer. 

It is for people: 

  • whose cancer has spread within the chest or elsewhere in the body. This is called extensive disease. 
  • who haven’t had chemotherapy 

More about this trial

You may have chemotherapy and atezolizumab as the first treatment for extensive small cell lung cancer. Researchers are trying to improve treatment. In this trial they are adding a drug called tiragolumab.

Tiragolumab is a new drug. It is type of immunotherapy. It blocks a protein in the body that stops the immune system  Open a glossary itemfrom working properly. Blocking this protein helps the immune system to find and fight cancer cells.

Atezolizumab is another type of immunotherapy drug. It works in a similar way to tiragolumab to stimulate the immune system. But it blocks a different protein. 

The chemotherapy drugs you have in this trial are called carboplatin and etoposide. These are standard chemotherapy drugs used to treat small cell lung cancer. 

In this trial some people have atezolizumab, chemotherapy and tiragolumab.  And some people have atezolizumab, chemotherapy and a dummy drug (placebo Open a glossary item).

The main aims of the trial are to find out:

  • if adding tiragolumab to atezolizumab and chemotherapy improves treatment
  • more about the side effects 
  • how treatment affects quality of life Open a glossary item

Who can enter

The following bullet points list the main entry conditions for this trial. Talk to your doctor or the trial team if you are unsure about any of these. They will be able to advise you. 

Who can take part

You may be able to join this trial if all of the following apply. 

  • have extensive stage small cell lung cancer and you haven’t had chemotherapy but you may have had chemoradiotherapy Open a glossary item with the aim to cure your cancer. The team check when you had chemoradiotherapy to see if you are suitable to join the trial. 
  • have cancer that your doctor can see and measure on a scan
  • are taking a stable dose of medication to thin the blood such as warfarin if you are on this treatment 
  • are well enough to carry out all your normal activities, but might not be able to do heavy physical work (performance status of 0 or 1
  • have a sample of tissue (biopsy Open a glossary item) available for the team to do some tests on
  • have satisfactory blood test results
  • are willing to use reliable contraception during treatment and for a period of time after if there is any chance you or your partner could become pregnant
  • are at least 18 years old 

Who can’t take part

You cannot join this trial if any of these apply. 

Cancer related

  • have cancer that has spread to the brain or spinal cord that is causing symptoms or is getting worse
  • have a condition called spinal cord compression Open a glossary item that hasn’t been treated or isn’t stable 
  • have had any other cancer within 5 years of joining the trial apart from carcinoma in situ (CIS Open a glossary item) of the cervix, non melanoma skin cancer Open a glossary item,  prostate cancer that hasn’t spread or DCIS Open a glossary item that has been successfully treated with surgery  
  • have already had tiragolumab, atezolizumab or similar drugs in the past 
  • are having treatment with an experimental drug as part of another clinical trial

Medical conditions
You can’t take part if any of the following apply. 


  • have or have had an autoimmune disease Open a glossary item or a problem with your immune system.  For example you have rheumatoid arthritis, multiple sclerosis or lupus. You may be able to take part if you have type 1 diabetes, thyroid problems that are controlled by medication or certain skin conditions.  
  • take drugs to stimulate the immune system Open a glossary item that may include the drugs interferon Open a glossary item or interleukin Open a glossary item. You had these within 4 weeks of being put into a treatment group. 
  • have taken drugs that damp down your immune system (immunosuppressants) such as steroids in the week before being put into a treatment group. You might still be able to take part if it was a very small dose, a cream, or an inhaler. 
  • have fluid on the lung or a collection of fluid in the tummy (abdomen) that needs regular draining 
  • have liver disease or damage to your liver  
  • have an infection including HIV, hepatitis B, hepatitis C, active tuberculosis (TB), Epstein Barr virus (EBV) or you might have it or a severe infection that needs treatment when you are put into a treatment group 
  • have scarring of the lungs that shows up on a scan unless you had radiotherapy to that area
  • have had a heart attack or stroke in the last 3 months or another heart problem that needs treatment 
  • have had major surgery for another condition in the month before joining a treatment group in this trial or you are to have major surgery 
  • have had a bone marrow transplant Open a glossary item or an organ transplant Open a glossary item
  • have any other medical condition or mental health problem that the trial team think might affect you taking part in the trial 

You can’t take part if any of the following apply. 

  • have had a live vaccine Open a glossary item within 4 weeks of joining a treatment group or you need one during the trial or for a period of time after 
  • are allergic to any of the treatments in the trial or anything they contain
  • are pregnant or breastfeeding 

Trial design

This is an international phase 3 trial. The researchers hope to find 470 people to take part including 13 people from the UK.

It is a randomised trial. There are 2 treatment groups. Neither you nor your doctor can decide which group you are in.

You have 1 of the following:

  • atezolizumab, chemotherapy and tiragolumab
  • atezolizumab, chemotherapy and a dummy drug 


You have treatment in cycles. Each 3 week period is a cycle of treatment Open a glossary item

Initial treatment (induction treatment)
For the first 4 cycles of treatment you have treatment as follows. On the first day of each cycle you have:

  • atezolizumab
  • tiragolumab or the dummy drug 
  • carboplatin and etoposide

You have treatment once every 3 weeks. You also have etoposide on days 2 and 3 of each treatment cycle. 

Cycle 1 to 4
Day 1
You have atezolizumab
You have tiragolumab or the dummy drug 
You have carboplatin and etoposide


Day 2
You have etoposide


Day 3
You have etoposide 


Ongoing treatment (maintenance treatment)
From cycle 5 onwards you don’t have any more chemotherapy. You have treatment as follows. On the first day of each cycle you have:

  • atezolizumab 
  • tiragolumab or the dummy drug 

You have treatment once every 3 weeks. 

Cycle 5 onwards
Day 1
You have atezolizumab
You have tiragolumab or the dummy drug


You have treatment for as long as it is working and the side effects aren’t too bad. 

Quality of life 
The trial team ask you to fill out a questionnaire before you start treatment and at set times during treatment. The questionnaire asks about side effects and how you’ve been feeling. This is called a quality of life study.

Blood and tissue samples
The researchers ask you to give 2 extra tissue samples. They also ask to take some extra blood samples. Where possible, you have these at the same time as your routine blood tests.

The researchers use the samples to look for differences in substances called biomarkers Open a glossary item. This can help researches work out why treatment might work for some people and not for others.

You don’t have to give these samples if you don’t want to. You can still take part in the trial. 

Hospital visits

You see a doctor and have some tests before you can join the trial. These include:

You have treatment at the hospital in the outpatient department. Each treatment visit takes between 4 and 6 hours. This might be slightly longer for the first cycle of treatment. You may also have some overnight stays. The team tell you when these happen.

You see the trial doctor once every 3 weeks for a check up and blood tests. 

You have a CT scan, MRI scan or bone scan:

  • every 6 weeks for a year and then
  • every 9 weeks until your cancer gets worse 

You see the team 1 month after you finish treatment. After that you see or speak with a member of the team every 3 months. This may be at a hospital visit or they may call you. 

Side effects

The trial team monitor you during treatment and afterwards. Contact your advice line or tell your doctor or nurse if any side effects are bad or not getting better. 

Tiragolumab and atezolizumab can affect the immune system. They may cause inflammation in different parts of the body which can cause serious side effects. They could happen during treatment, or some months after treatment has finished. Rarely, these side effects could be life threatening.

If you have any of these side effects, you should tell the doctor or nurse as soon as possible. You should tell them that you are on or have been on an immunotherapy. 


Tiragolumab is a new drug so there may be side effects we don’t know about. The side effects we know about so far include:

  • an allergic reaction causing fever, chills, shortness of breath, sickness, and changes in blood pressure
  • an increased risk of infection 

You may have some medication before tiragolumab to reduce the risk of having a reaction to the infusion. 

We have information about the side effects of:

Recruitment start:

Recruitment end:

How to join a clinical trial

Please note: In order to join a trial you will need to discuss it with your doctor, unless otherwise specified.

Please note - unless we state otherwise in the summary, you need to talk to your doctor about joining a trial.

Chief Investigator

Dr Raffaele Califano

Supported by


If you have questions about the trial please contact our cancer information nurses

Freephone 0808 800 4040

Last review date

CRUK internal database number:


Please note - unless we state otherwise in the summary, you need to talk to your doctor about joining a trial.

Last reviewed:

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