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Moore’s hypothesis had an obvious corollary. If breast cancer relapsed due to the inadequacy of the original surgical excisions, then even more breast tissue should be removed during the initial operation. Since the margins of extirpation were the problem, then why not extend the margins? Moore argued that surgeons, attempting to spare women the disfiguring (and often life-threatening) surgery were exercising “mistaken kindness”—letting cancer get the better of their knives. In Germany, Halsted had seen Volkmann remove not just the breast, but a thin, fanlike muscle spread out immediately under the breast called the pectoralis minor, in the hopes of cleaning out the minor fragments of leftover cancer.

Halsted took this line of reasoning to its next inevitable step. Volkmann may have run into a wall; Halsted would excavate his way past it. Instead of stripping away the thin pectoralis minor, which had little function, Halsted decided to dig even deeper into the breast cavity, cutting through the pectoralis major, the large, prominent muscle responsible for moving the shoulder and the hand. Halsted was not alone in this innovation: Willy Meyer, a surgeon operating in New York, independently arrived at the same operation in the 1890s. Halsted called this procedure the “radical mastectomy,” using the word radical in the original Latin sense to mean “root”; he was uprooting cancer from its very source.

But Halsted, evidently scornful of “mistaken kindness,” did not stop his surgery at the pectoralis major. When cancer still recurred despite his radical mastectomy, he began to cut even farther into the chest. By 1898, Halsted’s mastectomy had taken what he called “an even more radical” turn. Now he began to slice through the collarbone, reaching for a small cluster of lymph nodes that lay just underneath it. “We clean out or strip the supraclavicular fossa with very few exceptions,” he announced at a surgical conference, reinforcing the notion that conservative, nonradical surgery left the breast somehow “unclean.”

At Hopkins, Halsted’s diligent students now raced to outpace their master with their own scalpels. Joseph Bloodgood, one of Halsted’s first surgical residents, had started to cut farther into the neck to evacuate a chain of glands that lay above the collarbone. Harvey Cushing, another star apprentice, even “cleaned out the anterior mediastinum,” the deep lymph nodes buried inside the chest. “It is likely,” Halsted noted, “that we shall, in the near future, remove the mediastinal contents at some of our primary operations.” A macabre marathon was in progress. Halsted and his disciples would rather evacuate the entire contents of the body than be faced with cancer recurrences. In Europe, one surgeon evacuated three ribs and other parts of the rib cage and amputated a shoulder and a collarbone from a woman with breast cancer.

Excerpted from pages 64-65 of ‘The Emperor of All Maladies: A biography of Cancer’ by Siddharth Mukherjee