Patricia Robertshaw, 42, of Gisburn Road in Barrowford, Lancashire, pretended that she was having radiotherapy in order to earn three months' sick pay from Yorkshire Cancer Research in Harrogate, where she worked as an events manager.
Whilst off work, she then used fake degree certificates to apply for jobs at other companies, having already used the same fraudulent documents to attain the role at the charity.
York Crown Court heard how Robertshaw had produced three 'bogus' degree certificates for a masters in science and a doctorate in philosophy from the University of Leeds, as well as a masters in project management from Leeds Metropolitan University.
Prosecutors explained how the documents helped her to earn a £10,250 a year pay rise, which she earned for seven months, earning a total of £86,833 whilst working at the charity between September 2015 and November 2017.
Robertshaw's web of lies unravelled when other workers at the charity scanned the QR codes she had submitted on sick note forms and found they were invalid.
She pleaded guilty to four counts of fraud and one of forgery.
Handing her a sentence of four years and five months in jail on Thursday, March 14, Judge Andrew Stubbs QC told her: "Embedded in the charity as you were, you would have known the good that money would have done."
Discussing Roberthsaw's attempts to feign cancer, he said: "Those claims were as bogus as the qualifications you had used.
"This led to you claiming, without any apparent sense of shame, that you had cancer while working for a cancer charity.
"The charity relies upon the generosity of the public and as a result those who should have benefited from the research will have been impacted in some degree by the fraud of the defendant."
Robert Sandford, prosecuting, explained how Robertshaw started pretending to have cancer in April 2016, saying she was having treatment at the Airedale General Hospital in Bradford and at Barrowford Surgery in Nelson, Lancashire, before she was eventually found out in November 2017.
Her employers had twice offered her independent health assessments which she refused even going as far as forging sick notes.
Whilst on three-month sick leave, she applied for roles as an events and commercial lead at Manchester City Council and as the head of income generation at the Pendleside Hospice in Burnley.
The court heard how she had a conditional offer from the former, which would have paid her a salary of £49,313, and was close to getting an offer from the latter, which had an advertised salary of £36,075.
In a previous role at Leeds Beckett University, she was responsible for sending off students' assessments to the relevant exam board.
During this role she forged certificates saying they had passed their qualifications in order to save herself work, meaning that 55 students were given invalid certificates.
The court was told that the university has had to pay £500 settlements to 36 of those students, who were studying for qualifications in leadership and management.
Mr Sandford said: "As a result, these students thought they had valid certificates, only to find out that their hard work was to no avail."
Catherine Silverton, defending, explained how her client had a history of mental health difficulties and has a borderline personality disorder.
She said: "The defendant wishes to express through me her deepest remorse and regret for these offences.
"She acknowledges the harm done to all of the victims."
Speaking after the case, Detective Constable Shane Martin, who led investigations for North Yorkshire Police, said: “This is the most abhorrent fraud case I have investigated in 25 years of being a police officer.
“It’s absolutely incomprehensible that anyone could lie about having such a serious illness.
“Everything about the way Robertshaw conducted herself during this fraud is astonishingly unethical.
“It was a callous and calculated crime to try to trick her former employer – a charity that works for the good of real cancer patients and uses donations made in good faith to fund lifechanging services and research.
“Fortunately though, the charity detected that something was amiss and that led to an extensive fraud investigation by North Yorkshire Police.
“As our investigation progressed, we uncovered a level of deceit that is, frankly, shocking.
“Today’s sentence, however, ensures a truly immoral person has been dealt with justly.”