Eligibility Criteria:
Inclusion Criteria:
* Age ≥ 18 years.
* Patients followed in one of the following AP-HP clinical departments: Medical oncology - Pitié-Salpêtrière, Clinical haematology - Pitié-Salpêtrière, Hepato-Gastroenterology - Pitié-Salpêtrière, Maxillo-facial surgery - Pitié-Salpêtrière, Radiation oncology - Pitié-Salpêtrière, Pneumology - Tenon, Medical oncology - Tenon, Radiation oncology - Tenon, Medical oncology - Saint-Antoine, Clinical haematology - Saint-Antoine, Pneumology - Bichat, ENT and cervico-facial surgery - Bichat, Pneumology - Cochin, Medical Oncology - HEGP, Medical Oncology - Saint Louis, Pneumology - Ambroise Paré, Medical Oncology - Avicennes
Histologically confirmed diagnosis of :
* HPV-related squamous cell carcinoma of the oropharynx (positive HPV PCR).
* Non-HPV-related squamous cell carcinoma of the oropharynx (negative HPV PCR).
* HIV-associated non-small cell lung cancer (NSCLC) (positive HIV serology).
* HPV-related NSCLC (malignant transformation of recurrent respiratory papillomatosis with positive HPV PCR).
* NSCLC neither HPV-related (negative HPV PCR) nor HIV-associated (negative HIV serology).
* Large-cell B lymphoma (diffuse large-cell NOS B lymphoma, high-grade B lymphoma, primary B lymphoma of the central nervous system):
* Post-transplant lymphoma (PTL) linked or not to Epstein-Barr virus (EBV)(EBER positive or negative on tumour tissue).
* Associated with HIV (positive HIV serology) and EBV-related or not (positive or negative EBER on tumour tissue).
* Associated with neither HIV nor EBV (negative HIV serology, negative EBER on negative tumour tissue).
* HPV-related squamous cell carcinoma of the anal canal (positive HPV PCR) and associated with HIV (positive HIV serology).
* HPV-related squamous cell carcinoma of the anal canal (positive HPV PCR) not associated with HIV (negative HIV serology).
* Patients in the virus-associated cancers VS non-virus-associated cancers groups will be matched on important clinical features within the groups:
* Oropharyngeal squamous cell carcinoma: tumour stage (I/II or III/IV according to 8th TNM (85)), smoking status (smoker or non-smoker) and systemic anti-tumour treatment planned or received (cytotoxic chemotherapy or Immune checkpoint inhibitors (ICI)(anti PD1) or cytotoxic chemotherapy and ICI(anti PD1)).
* NSCLC: histology (squamous cell carcinoma or adenocarcinoma), tumour stage (I/II or III/IV according to 8th TNM (85)), smoking status (smoker or non-smoker) and systemic anti-tumour treatment planned or received (ICI (anti PD1) or cytotoxic chemotherapy and ICI (anti PD1)).
* NHL: patients will be matched 2:2 (LPT EBV+ vs EBV- and HIV+ EBV+ vs EBV-) on location (systemic vs brain), performans status (PS 0-1 vs 2-4) for brain lymphomas, and age-adjusted IPI score (LDH, performans status, stage: 0-1 vs 2-3) for systemic lymphomas.
* Squamous cell carcinoma of the anal canal: tumour stage (I/II or III/IV according to 8th TNM (85)), and anti-tumour treatment planned or received (cytotoxic chemotherapy or cytotoxic chemotherapy and radiotherapy).
For the analysis of the characteristics of the MET at diagnosis: tumour material (biopsy or surgical specimen) available dating from before the introduction of anti-cancer treatments. This tumour material must come from the tumour's organ of origin for patients in the oropharynx, NSCLC and anal canal cohorts.
* For the analysis of mechanisms of resistance to systemic anti-tumour treatments: tumour material (biopsy or surgical specimen) available from before the introduction of anti-cancer treatments and tumour material (biopsy or surgical specimen) taken after tumour progression under treatment and before the introduction of a new systemic anti-tumour treatment. This tumour material must come from the tumour's organ of origin for patients in the oropharynx, NSCLC and anal canal cohorts.
* Cancer that has undergone or is due to undergo excision surgery or biopsy.
* Informed consent to participate signed before any specific study procedure is carried out.
* Affiliation with the French social security system.
Exclusion Criteria:
* Cancers other than those included in the study.
* For NHL: plasmablastic lymphoma, polymorphic lymphoma, follicular lymphoma, mantle cell lymphoma, lymphoplasmacytic lymphoma, marginal zone lymphoma, unknown tumour EBV status, unknown HIV status.
* For lung cancers: NSCLC with histology other than adenocarcinoma or squamous cell carcinoma, small cell lung cancer, EGFR mutation, ALK rearrangement.
* Absence of tumour material dating from before the start of systemic anti-tumour treatments.
* For oropharynx, NSCLC and anal canal: tumour material not from the tumour's organ of origin.
* Tumour material of interest exhausted: insufficient for the analyses planned in the study.
* For the anal canal, oropharynx and NSCLC cohorts: immunosuppressive treatment (corticosteroids \<10mg prednisone equivalent per day authorised).
* Adults under guardianship or curatorship.
* Refusal to take part in the study