5th February 2024

A 54-year-old female has presented with worsening shortness of breath and dry cough for six months

A 54-year-old female has presented with worsening shortness of breath and dry cough for six months. CXR shows bilateral fine reticular changes. Blood tests show worsening liver function tests. Sputum cultures were negative. She notes that her symptoms began approximately three months after commencing on a new medication for her rheumatoid arthritis. It was felt that her rheumatoid arthritis medication was the likely cause.

Given the most likely causative agent, which of the following cell cycle phases does this medication exert its action?

Select the SINGLE most appropriate option from the list below. Select ONE option only.