BRCA1 and neoplasm: Therefore, with respect to the, now twice-reported, strikingly uncommon occurrences of good health lasting into adulthood, in spite of homozygosity, we propose that further studies and experiments on this mutation, or others affecting the protein in a similar way, may cast light on a specific, tumor-suppressive nature of BRCA1 that has not yet been recognizable from other BRCA1 functions.