'Since we laid out our plans to tackle this challenge in 2014, Cancer Research UK has already substantially increased its funding into brain tumours and attracted some of the world's leading experts to the UK'.
Professor Silvia Marino, Director of the Brain Tumour Research Centre of Excellence at Queen Mary, presented an overview of her group's research and their focus on glioblastoma multiforme (GBM), the most common and most aggressive adult malignant brain tumour.
It's just one part of a £45m investment from the Government and Cancer Research UK.
The 70-year-old said she wasn't afraid of the killer disease, but called for patients to be able to try out more experimental treatments on the NHS, as she told all about the devastating illness.
The funding will be invested through the National Institute for Health Research over the next five years - with the aim of doubling this once new high-quality research proposals become available.
Cancer Research UK's funding will support two new specialised centres. "Of course, there will be challenges, but the announcement is a step in the right direction and we now need policymakers and health care professionals, the world over, to work together to accelerate the discovery of powerful new treatments".
A centre focusing on adult brain tumours is due to open later this year.
"Gathering this expertise together means we can shine a light on the numerous challenges and difficulties that brain tumours pose and discover new treatments to ensure that more children survive their disease".
While survival rates for most cancers are at record levels, those for people with brain tumours have barely improved for 30 years.
Tweeting after the meeting, Mrs May said: 'It was lovely to spend time with @TessaJowell and her family, talking with @Jeremy_Hunt about working with @CR_UK to provide a £45 million boost to brain tumour research to tackle a disease where survival remains woefully low.
Each year around 11,400 people in the United Kingdom are diagnosed with a brain tumour and just 14 per cent survive the disease for 10 or more years.
Later today the Secretary of State for Health and Social Care Jeremy Hunt and Baroness Tessa Jowell will chair a roundtable with key brain cancer charities, leading academics and pharmaceutical companies to discuss how to improve brain cancer diagnosis and treatment.
Almost 11,500 people are diagnosed with brain cancer every year and just 14% now live for 10 years or more - making it one of the deadliest forms of cancer.