Avira, Tosfas asks the question on hoil in Pesachim that maybe the melacha, work on Shabbos can be required for pekiach nefes, so how can any melacha be assur? Tosfas answers that cholei sheyesh bo sakana lo shechiach, a dangerous illness is not common. Similarly, cancer research is not required to be done on Shabbos.
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