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Objectives: Fanconi anaemia (FA) is a rare inherited bone marrow failure and autosomal recessive blood disorder. FA patients have a higher risk of cancer, including acute myeloid leukaemia and squamous cell carcinoma. Maximum, but not all, affected individuals have one or more somatic abnormalities, including skin, skeletal, genitourinary, gastrointestinal, cardiac and neurological anomalies, etc. Positive stress cytogenetics has immense implications for the treatment and management of FA. The aim of our study was to find out the incidence of FA in the population of phenotypically normal aplastic anaemia (AA) patients in West Bengal. Methods: Ethical clearances were obtained from the corresponding institutional committees. A total of 117 AA cases was selected. Stress cytogenetics was performed from peripheral venous blood (PVB) samples of 63 AA patients (age ≤ 50 years) and 63 age- and sex-matched healthy individual (control) using Mitomycin C (MMC). Results: Out of 63 AA patients, 6 (9.25%) cases showed positive stress cytogenetics suggestive of FA, which is statistically significant (p-value - 0.000532), analysed by chi-square test. Discussion: A considerable percentage of patients showing sensitivity towards MMC, even if they are phenotypically normal and did not have any distinguishable features which are generally found in FA. Conclusion: This observation may indicate that stress cytogenetics analysis of phenotypically normal AA patients (≤50 years) is essential for the improvement of the treatment procedure. [ABSTRACT FROM AUTHOR]