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Esophageal cancer

Esophageal cancer

Epidemiology:

Esophageal cancer represents a significant public health challenge, being the seventh most common cancer worldwide and the sixth leading cause of cancer-related mortality, with approximately 572,000 new cases and 509,000 associated deaths annually 1. Despite aggressive treatment modalities, including chemoradiotherapy and surgical interventions, the phenomenon of spontaneous remission (SR) in esophageal cancer remains exceedingly rare; documented cases suggest SR occurs in less than 1% of patients diagnosed, highlighting the enigmatic nature of tumor regression without therapeutic intervention 2,3.

Clinical Characteristics:

To date, only four well-documented cases of spontaneous regression involving esophageal cancer have been reported. These cases underscore the exceptional rarity of SR in esophageal malignancies and highlight the unpredictable nature of tumor regression within this anatomical site. The reported patients ranged from 36 to 78 years of age and included both men and women, with regression occurring at primary esophageal sites and, in one instance, concurrently within pulmonary lesions. See Table 1 below for further information.

Histological Characteristics:

Among the reviewed cases, the tumor origin was strictly confined to the esophagus, with remission occurring either at the primary esophageal site, within pulmonary lesions, or, in one case, in regional lymph nodes. Reports involving gastroesophageal junction tumors or esophagus-adjacent conditions were excluded to maintain diagnostic accuracy and ensure that only true instances of spontaneous remission in esophageal carcinoma were included.

Proposed Contributing Mechanisms:

Proposed mechanisms for remission varied among the reported esophageal cancer cases. One case attributed regression to T-cell–associated immunologic changes, while another suggested a more generalized immune response. In the remaining two cases, no mechanism was reported. Overall, the available evidence remains insufficient to establish a definitive cause of spontaneous regression.

Site and Extent of Remission:

The documented esophageal cancer cases demonstrated spontaneous regression occurring at the primary tumor site, with additional remission observed in pulmonary lesions and regional lymph nodes in isolated reports. Only one case provided a defined follow-up duration, showing no recurrence for 14 months, while the remaining cases did not report longitudinal outcomes. These cases highlight that spontaneous remission, while exceptionally rare in esophageal carcinoma, may occasionally result in clinically meaningful tumor regression.

Table 1: Esophageal cancer SR Cases and Clinical Characteristics

Author–year

Age/sex

Primary site

Remission site

Proposed mechanisms

Follow-up

Ohwada et al., 19904

78/M

Esophagus

Pulmonary; Esophagus

T-cell changes

14 months

Vergeau et al., 19915

36/M

Esophagus

Esophagus

Not reported

Not reported

Khan et al., 20216

66/F

Esophagus

Esophagus

Immune response

Not reported

Mitchell et al., 20217

58/F

Esophagus

Lymph nodes

Not reported

Not reported

Kubota, 20038

73/M

Liver

Esophagus

Immune mechanism

References:

  1. Ishihara R. Surveillance for metachronous cancers after endoscopic resection of esophageal squamous cell carcinoma. Clin Endosc. 2024;57(5):559-570. doi:10.5946/ce.2023.263
  2. Ohwada S, Miyamoto Y, Fujii T, Oyama T, Joshita T, Izuo M. Spontaneous regression of esophageal carcinoma with pulmonary metastases: case report. Jpn J Clin Oncol. 1990;20(2):193-198.
  3. Vergeau B, Molinie C, Grandpierre G, Vindrios J. Spontaneous partial elimination of a carcinoma of the esophagus. Gastrointest Endosc. 1991;37(5):591. doi:10.1016/S0016-5107(91)70852-3
  4. Ohwada S, Miyamoto Y, Fujii T, Oyama T, Joshita T, Izuo M. Spontaneous regression of esophageal carcinoma with pulmonary metastases: case report. Jpn J Clin Oncol. 1990;20(2):193-198.
  5. Vergeau B, Molinie C, Grandpierre G, Vindrios J. Spontaneous partial elimination of a carcinoma of the esophagus. Gastrointest Endosc. 1991;37(5):591. doi:10.1016/S0016-5107(91)70852-3
  6. Khan H, Casey P, Hayes S, Tokala A, Sultan J. Spontaneous regression of oesophageal squamous cell carcinoma. BMJ Case Rep. 2021;14(6):e241344. doi:10.1136/bcr-2020-241344
  7. Mitchell R, Kaur A, Munoh Kenne F, Khan A, Zafar W. Spontaneous Regression of Metastatic Lesions of Adenocarcinoma of the Gastro-Esophageal Junction. Cureus. 2021;13(10):e18784. doi:10.7759/cureus.18784
  8. Kubota, M., Sueyoshi, S., Fujita, H., Fujii, T., Yamana, H., & Shirouzu, K. (2003). spontaneous regression in small cell esophageal carcinoma. The Japanese journal of thoracic and cardiovascular surgery : official publication of the Japanese Association for Thoracic Surgery = Nihon Kyobu Geka Gakkai zasshi, 51(12), 660–664. https://doi.org/10.1007/s11748-003-0005-8
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