S4 Capital disclosed in a regulatory filing today that Executive Chairman Martin Sorrell is undergoing “preventative treatment” following surgery in February to remove a tumor.  

The company disclosed in February that Sorrell underwent laparoscopic surgery but did not elaborate other than to say he was expected to make a rapid and full recovery and continue to be fully engaged in the company’s affairs. 

Today’s filing did not describe Sorrell has having cancer of any kind although The Guardian reported he was undergoing cancer treatment. Company reps could not be reached for comment at deadline. 

The filing included a memo from Sorrell to staffers, which indicated that after consulting with doctors, Sorrell decided “I should have preventative treatment over the coming months.” 

Sorrell wrote that during treatment he should be able to “work as normal most of the time.” But he added, “although I have also decided to reduce my travel schedule for a few weeks. Otherwise, business as usual.” 

Here’s the memo in full as reported to the UK’s Regulatory News Service: 

"To all S4.Monks: 

I wanted to update you following the successful keyhole surgery I had in February, which was to remove a tumour. I have made an excellent recovery, and, as you would expect, I have sought the best possible medical advice. My conclusion is that I should have preventative treatment over the coming months. My doctors have advised me that during this treatment, I should be able to work as normal most of the time, fully engaging with the Company and our excellent Executive team, although I have also decided to reduce my travel schedule for a few weeks. Otherwise, business as usual. Thank you as ever for your continued support and let me know how to help you in any way I can. 

Sir Martin Sorrell"