The drop in the number of cancers detected during the Covid-19 pandemic could be as high as 14 per cent, preliminary data has suggested.
A report from the National Cancer Registry said it was still too early to provide "definitive answers" on whether pandemic hospital restrictions last year led to a reduction in the number of cancers diagnosed.
The registry’s annual report said an estimated decrease of 14 per cent in detections pointed to the “potential scale” of Covid-19’s impact on other healthcare.
A separate analysis of data on microscopically verified cancers diagnosed last year showed a reduction of between 10 and 13 per cent, the report said.
The drop in confirmed cancer cases, when compared with previous years, could be partly accounted for by “incomplete registration of cases already diagnosed”, it said.
Prof Deirdre Murray, director of the National Cancer Registry, said there were "clear signals that, as expected in Ireland, the number of cancer diagnoses in 2020 will be lower than in previous years".
Averil Power, chief executive of the Irish Cancer Society, said the organisation was "very worried" over the significant drop in cancers diagnosed last year.
The shortfall in cancers being diagnosed would present a “major challenge” in the coming years, with lengthy waiting lists and disruptions to screening services “all too commonplace” already, she said.
Ms Power said it was frightening to think of the people who were living with cancer but did not know it yet. She added that existing cancer patients were “terrified” of having treatments delayed due to the recent rise in Covid-19 cases.
The registry’s report said there were about 44,000 tumours identified each year between 2017 and 2019.
Not counting non-melanoma skin cancer, the most common cancer diagnoses were for breast and prostate cancer, which made up almost a third of invasive cancers found in women and men respectively.
For men this was followed by bowel and lung cancer, and melanoma of the skin. Lung cancer was the second most common cancer for women, followed by colorectal cancer and melanoma of skin.
Nearly a third of deaths in 2018 were attributed to cancer, with lung cancer the leading cause of death from cancer, the report said.
The second, third and fourth most common cancers to die from in men were bowel, prostate and oesophagus cancer. For women breast, bowel and ovarian cancers were the most common fatal cancers.
The report said there were almost 200,000 cancer survivors in Ireland at the end of 2019, with breast cancer patients making up more than a fifth of the total.
The research found cancer rates among men had dropped between 2010 and 2019, with mortality rates decreasing or remaining the same across nearly every type of cancer. Rates of cancer detected among women had increased between 2008 and 2019, with mortality rates for most cancers decreasing.
The report said the five-year survival rate from cancer had increased to 65 per cent for the period 2014 to 2018, compared with 42 per cent two decades previous.
There had been “major improvement” in survival rates for most major cancers, however, the research noted the chances of survival varied significantly depending on the type of cancer.
Prostate, melanoma of the skin and testis cancer had survival rates of more than 90 per cent, followed closely by breast and thyroid cancer, and Hodgkin lymphoma. Pancreas, liver, oesophagus and lung cancers had much lower five-year survival rates on average, the report said.