The singer said it is so frustrating that many cancer drugs are deemed too expensive to be offered on the NHS.
The boyband reunited on stage for the first time since 2014 for a special show in aid of Stand Up To Cancer and the National Brain Appeal, following Tom Parker's cancer diagnosis.
Tom Parker, Max George, Jay McGuiness, Nathan Sykes and Siva Kaneswaran are reforming, seven years after they split.
The mother-of-two appeared on Loose Women where she spoke about the positive improvements in her husband's health.
The Wanted singer shared a series of photos on his Instagram Stories showing him arriving at the vaccination centre.
The singer is currently undergoing treatment for a brain tumour, which he recently said had reduced in size.
The 32-year-old told fans he had been diagnosed with an inoperable brain tumour back in autumn.
The Wanted star Tom Parker's son was born just months after the star told fans he has an inoperable brain tumour.