[2] Sen was born on 3 August 1930 in Dighirpar village, Kotalipara Upazila, Gopalganj District, East Bengali, British India.
[6] The Bangladesh Federal Union of Journalists and Dhaka Union of Journalists demanded the government send Sen abroad for medical treatment on 27 October 2003 after he had suffered stroke and was admitted to Bangabandhu Sheikh Mujib Medical University.
[10] The Minister of Foreign Affairs, M Morshed Khan, and the ambassador of Bangladesh to Singapore, Munshi Faiz Ahmed, visited him at the hospital.
[11] In February 2004, Sen's Sramik Krishak Samajbadi Dal met with Awami League to talk about forming a coalition.
[13] Sen presided over a meeting of the Left Democratic Front on 26 December 2005, which called on the government to provided subsidized fertilizer to farmers.