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. 2014 Sep 24;1(1):140080. doi: 10.1098/rsos.140080

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© 2014 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — (a) Spherical geometry: a cross section of a tumour spheroid of radius r_o. Oxygen partial pressure at r_o is p_o and oxygen partial pressure falls to 0 at r_n, the radius of the anoxic region. (b) A cross section of a DLD-1 colorectal spheroid with same regions visible [10].