U.S. drugmaker Pfizer Inc said on Tuesday it will offer its full portfolio of drugs, including off-patent medicines such as chemotherapies and oral cancer treatments, on a not-for-profit basis to 45 low-income countries in the world.

In an expansion of the company's "An Accord for a Healthier World" program, which is aimed at increasing access to innovative treatments in some of the world's poorest countries, Pfizer said it will now offer a total of 500 products.

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When the drugmaker launched the program in May 2022, it offered only its patented medicines including COVID-19 treatment Paxlovid and its big-selling breast cancer drug, Ibrance, at a not-for-profit price.