Matt Hancock has urged non-coronavirus patients requiring urgent care to seek help immediately, saying “the NHS is there for you”.

Speaking in the House of Commons, the Health Secretary said those who are unwell must not let fear of Covid-19 stop them contacting their GP.

His comments came after research from one of the UK’s leading cancer charities found 2,200 new cases of cancer could be going undetected each week.

Mr Hancock said he could not guarantee all cancer treatment would go ahead as there are some treatments that are “clinically inadvisable” due to the risk of catching Covid-19.

If you take somebody’s immune system down to very low levels then that puts them at significant risk

He told MPs: “There is some cancer treatment that it is clinically inadvisable to undertake during an epidemic because if you take somebody’s immune system down to very low levels then that puts them at significant risk.

“So I can’t give the guarantee that all cancer treatment will go ahead because, even though we have capacity now in the NHS and we are confident that capacity will not be overwhelmed by the virus, the virus is still at large in the community so there are some cancer treatments that it is clinically inadvisable to undertake now, especially around immunotherapy.”

Cancer Research UK found that the number of urgent referrals by GP has dropped to about 25% of usual levels.

This is down to fewer people going to see their GP and also due to practitioners’ reluctance to send patients to hospital due to the risk of Covid-19 infection, the charity said.

It added that screening services have been formally paused in Scotland, Wales and Northern Ireland and are “de facto” paused in England as no appointments are being made at screening hubs.

Previously, these services were screening around 200,000 people each week for diseases such as bowel cancer, breast cancer and cervical cancer across the UK, picking up an average of 2,250 cases.

But Mr Hancock said the NHS had “not at any point been overwhelmed by coronavirus”.

“Today I want to reinforce the message that non-Covid NHS services are open for patients – the NHS is there for you if you need advice and treatment,” he said.

“I want to address very clearly this message to those who might be vulnerable to heart attacks or stroke, to parents of young children, to pregnant women and to people with concerns that they may have cancer.

“I want to emphasise that people with non-coronavirus symptoms must still contact their GP.”

He continued: “If you are told to go to hospital, the place you need to be is in hospital.

“The NHS is there for you and can provide the very best care if you need it.”

Cancer Research UK fears the current low levels of cancer referrals could jeopardise the recovery of thousands of people, as early-stage cancers are significantly easier to treat.

In analysis on its website, it said doctors are concerned that early-stage cancers are being “parked” for three months or more.

After this point, the chances of curative surgery to remove all of the cancerous tissue – reducing the need for chemo or radiotherapy – become less likely.

Cancer Research UK is now calling on the NHS to develop a plan to dramatically ramp up screening services to deal with the backlog of cases once it is safe to do so.

Professor Charles Swanton, chief clinician at Cancer Research UK, told Radio 4’s Today programme that the Government needs to urgently deliver on its promise to create “Covid-free” hubs in private hospitals.

“In some parts of the country that is definitely happening, patients are having Covid-19 screening 48 hours prior to surgical admission,” he said.

“What is not happening routinely right now – although there are promising signs – is the routine screening of all staff, not just symptomatic but asymptomatic staff, in an effort to create truly coronavirus-free cancer hubs.”

Professor Martin Marshall, chairman of the Royal College of GPs, said on Tuesday: “We can’t stress enough how important it is that patients who have concerns about their health, such as potential cancer symptoms, contact their GP practice during the Covid-19 pandemic.”

He added that, although most practices are carrying out consultations remotely via video or telephone, arrangements could be made so that patients who need to see a clinician face to face can do so safely.