Coleen Nolan, 55, has shared her concerns for her sister Linda Nolan, 61, after learning that the coronavirus pandemic has had an impact on the latter's breast cancer treatment.The Loose Women star opened up about the “worrying” situation during an appearance on This Morning today.Coleen explained on the show that Linda receives regular treatment in hospital to “strengthen her bones and keep the cancer at bay”.However, current NHS guidelines say cancer specialists should discuss with their patients whether it is riskier for them to undergo or to delay treatment due to the spread of COVID-19.Cancer and its treatment can weaken the immune system, which makes a person more vulnerable to the virus.