Lung India

: 2019  |  Volume : 36  |  Issue : 3  |  Page : 256--259

”St. Peregrine tumor” with synchronous primary renal cell carcinoma

Sameer Vaidya1, Dipti Gothi1, Mahismita Patro1, Ram Babu Sah1, Ritu Kulshreshtha2,  
1 Department of Pulmonary Medicine, ESI-PGIMSR, Delhi, India
2 Department of Pathology, VPCI, New Delhi, India

Correspondence Address:
Dr. Dipti Gothi
Department of Pulmonary Medicine, ESI-PGIMSR, Delhi

How to cite this article:
Vaidya S, Gothi D, Patro M, Sah RB, Kulshreshtha R. ”St. Peregrine tumor” with synchronous primary renal cell carcinoma.Lung India 2019;36:256-259

How to cite this URL:
Vaidya S, Gothi D, Patro M, Sah RB, Kulshreshtha R. ”St. Peregrine tumor” with synchronous primary renal cell carcinoma. Lung India [serial online] 2019 [cited 2019 Dec 8 ];36:256-259
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Full Text


We present a very rare case of squamous cell lung cancer having spontaneous regression (St. Peregrine tumor) with a synchronous primary renal cancer.

A 74-year-old male, chronic smoker with smoking index of more than 20 pack year, Stage III chronic obstructive pulmonary disease, presented with worsening exertional dyspnea and productive cough of 2-month duration. His chest radiograph showed a right parahilar opacity [Figure 1]a. The high-resolution computed tomography (CT) of chest showed a solid lesion in the right upper lobe with spiculated margin, internal hypoenhancing area, and positive bronchus sign [Figure 1]b. An incidental note was also made of a heterogeneously enhancing lesion in the mid pole of the right kidney. The sputum examination was negative for acid-fast bacilli, pyogenic culture, and GeneXpert. A fiberoptic bronchoscopy with transbronchial lung biopsy (TBLB) was performed. The TBLB was inconclusive. A CT-guided lung biopsy was performed. The chest radiograph and CT scan performed at the time of CT-guided biopsy showed that the lesion had significantly increased in size [Figure 1]c and [Figure 1]d. It showed mixed inflammatory infiltrate, pigmented macrophages, and dense bronchoalveolar and interstitial fibrosis. The immunohistochemistry of the specimen was positive for CD8+ cells and natural killer cell, but there was no evidence of pyogenic infection or tuberculosis. A repeat biopsy was planned. However, the patient was lost to follow-up and reported back after 1 month. The chest radiograph and CT scan showed that the lesion became cystic [Figure 1]e and [Figure 1]f. Hence, ultrasound-guided needle aspiration from the right kidney was done, which came positive for malignant cells. The patient underwent nephrectomy. Histopathological examination of the kidney mass revealed clear-cell carcinoma. The follow-up chest radiograph and CT after nephrectomy [Figure 1]g and [Figure 1]h showed increase in size again. CT-guided lung biopsy now showed squamous cell carcinoma of lung, positive for P63 and P40 and negative for transcription termination factor 1. The first lung biopsy, immunohistochemistry, kidney biopsy, and second lung biopsy are shown in [Figure 2]a, [Figure 2]b, [Figure 2]c, [Figure 2]d. The final diagnosis made was – spontaneously regressing squamous cell carcinoma lung – “St. Peregrine tumor” – with “synchronous primary” clear-cell carcinoma right kidney.{Figure 1}{Figure 2}

Everson and Cole defined spontaneous regression (SR) as the partial or complete disappearance of a malignant tumor.[1] Kumar et al.[2] presented “modified Everson and Cole criterion” which defines SR as: (1) the partial or complete disappearance of the tumor in the absence of all systemic or local treatment of the primary or metastatic lesion, (2) the patient has not received any systemic therapy (chemotherapy, radio-ablative techniques, and chemoembolization), and (3) primary malignancy is histologically diagnosed or the lesion appears malignant radiographically or clinically. This phenomenon of SR is known for several hundred years and is also termed as St. Peregrine tumor.[1] In our patient, the lesion had almost completely disappeared, he did not receive any specific treatment, the lesion appeared malignant radiologically, and it was proven malignant subsequently. Since he satisfied all the criteria, he was diagnosed to have “St. Peregrine tumor.”

The incidence of SR is reported to be 1 in 60,000–100,000.[3] Kumar et al.[2] reported only two cases of SR due to primary lung cancers from 71 cases between 1951 and 2008. We could find only nine cases of squamous cell carcinoma having SR in MeSH database of PubMed. In majority of the reported cases, the possible cause of SR was not known [Table 1].[4],[5],[6],[7],[8],[9],[10],[11],[12]{Table 1}

The possible mechanisms that are associated with SR are apoptosis, immune mediated, microenvironment changes, and DNA oncogenic suppression.[13] Coley had proposed a role of infection in regression of tumors.[14] Studies conducted by Scheider et al. and Iwakami et al. showed regulatory T-cells and CD8-positive lymphocytes, respectively, in lung malignancies with SR.[15] The biopsy specimen of our patient showed CD8+ cells and natural killer cell, suggesting that T-cell-mediated reaction around the tumor leads to regression. The immunological reaction leading to SR in our case was possibly due to synchronous primary because lung cancer regressed in the presence of renal cancer and the removal of renal cancer led to reappearance of lung cancer. The presence of two malignancies in our patient, i.e., multiple primary malignancies, were synchronous primary tumors because they were diagnosed within a 6-month interval.

To conclude, there have been case reports of synchronous primary lung and renal cancer, but squamous cell carcinoma of lung and clear cell carcinoma of kidney have not been reported so far. The synchronous primary possibly led to immunological regression of lung cancer.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.


We sincerely thank the department of pathology for providing us the histopathology photomicrographs.

Financial support and sponsorship


Conflicts of interest

There are no conflicts of interest.


1Everson TC, Cole WH. Spontaneous regression of malignant disease. J Am Med Assoc 1959;169:1758-9.
2Kumar T, Patel N, Talwar A. Spontaneous regression of thoracic malignancies. Respir Med 2010;104:1543-50.
3Cole WH. Efforts to explain spontaneous regression of cancer. J Surg Oncol 1981;17:201-9.
4Sperduto P, Vaezy A, Bridgman A, Wilkie L. Spontaneous regression of squamous cell lung carcinoma with adrenal metastasis. Chest 1988;94:887-9.
5Liang HL, Xue CC, Li CG. Regression of squamous cell carcinoma of the lung by Chinese herbal medicine: A case with an 8-year follow-up. Lung Cancer 2004;43:355-60.
6Pujol JL, Godard AL, Jacot W, Labauge P. Spontaneous complete remission of a non-small cell lung cancer associated with anti-Hu antibody syndrome. J Thorac Oncol 2007;2:168-70.
7Gladwish A, Clarke K, Bezjak A. Spontaneous regression in advanced non-small cell lung cancer. BMJ Case Rep 2010;2010. pii: bcr0720103147.
8Furukawa M, Oto T, Yamane M, Toyooka S, Kiura K, Miyoshi S, et al. Spontaneous regression of primary lung cancer arising from an emphysematous bulla. Ann Thorac Cardiovasc Surg 2011;17:577-9.
9Choi SM, Go H, Chung DH, Yim JJ. Spontaneous regression of squamous cell lung cancer. Am J Respir Crit Care Med 2013;188:e5-6.
10Park YH, Park BM, Park SY, Choi JW, Kim SY, Kim JO, et al. Spontaneous regression in advanced squamous cell lung carcinoma. J Thorac Dis 2016;8:E235-9.
11Esplin N, Fergiani K, Legare TB, Stelzer JW, Bhatti H, Ali SK, et al. Spontaneous regression of a primary squamous cell lung cancer following biopsy: A case report. J Med Case Rep 2018;12:65.
12Ariza-Prota M, Martínez C, Casan P. Spontaneous regression of metastatic squamous cell lung cancer. Clin Case Rep 2018;6:995-8.
13Salman T. Spontaneous tumor regression. J Oncol Sci 2016;2:1-4.
14Jessy T. Immunity over inability: The spontaneous regression of cancer. J Nat Sci Biol Med 2011;2:43-9.
15Lopez-Pastorini A, Plönes T, Brockmann M, Ludwig C, Beckers F, Stoelben E, et al. Spontaneous regression of non-small cell lung cancer after biopsy of a mediastinal lymph node metastasis: A case report. J Med Case Rep 2015;9:217.