 Apart from Mackenzie, the other doctors, led by Bergmann, now held the firm opinion that the Crown Prince's disease was cancer and that it had possibly spread to his lungs.The diagnosis of laryngeal cancer was conclusively confirmed on 6 March, when the anatomist Professor Wilhelm Waldeyer, who had come to San Remo, examined Frederick's sputum under a microscope and confirmed the presence of "so-called cancroid bodies...from a cancerous new growth" that was in the larynx.He further said that there were no signs of any growths in the lungs.